/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_7.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:23:52,653 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:23:52,656 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:23:52,706 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:23:52,707 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:23:52,711 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:23:52,714 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:23:52,722 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:23:52,726 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:23:52,732 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:23:52,733 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:23:52,735 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-10-23 18:23:52,803 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:23:52,805 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:23:52,805 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:23:52,806 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-23 18:23:52,851 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:23:52,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:23:52,856 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:23:52,856 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:23:52,857 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:23:52,857 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:23:52,857 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:23:52,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:23:52,858 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:23:52,858 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:23:52,861 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:23:52,861 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:23:52,861 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:23:52,862 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:23:52,862 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:23:52,862 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:23:52,862 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:23:52,862 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:23:52,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:23:52,863 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:23:52,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:23:52,864 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:23:52,864 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:23:52,865 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:23:53,320 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:23:53,377 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:23:53,380 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:23:53,382 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:23:53,383 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:23:53,384 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-10-23 18:23:53,478 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c756d13/f5cc7cfc917e47e4b51aa7c4ff2c6e5b/FLAG49274a984 [2020-10-23 18:23:54,179 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:23:54,180 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-10-23 18:23:54,189 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c756d13/f5cc7cfc917e47e4b51aa7c4ff2c6e5b/FLAG49274a984 [2020-10-23 18:23:54,544 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c756d13/f5cc7cfc917e47e4b51aa7c4ff2c6e5b [2020-10-23 18:23:54,548 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:23:54,555 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:23:54,557 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:23:54,557 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:23:54,562 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:23:54,563 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,566 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f81888b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54, skipping insertion in model container [2020-10-23 18:23:54,567 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,576 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:23:54,596 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:23:54,774 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:23:54,785 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:23:54,811 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:23:54,828 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:23:54,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54 WrapperNode [2020-10-23 18:23:54,829 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:23:54,830 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:23:54,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:23:54,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:23:54,843 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,852 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,852 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,859 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,866 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (1/1) ... [2020-10-23 18:23:54,871 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:23:54,872 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:23:54,872 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:23:54,873 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:23:54,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (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 18:23:54,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:23:54,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:23:54,952 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:23:54,952 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:23:54,952 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:23:54,953 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:23:54,953 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:23:54,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:23:54,953 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 18:23:54,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:23:54,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:23:54,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:23:54,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:23:54,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:23:54,954 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:23:54,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:23:55,583 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:23:55,584 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 18:23:55,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:23:55 BoogieIcfgContainer [2020-10-23 18:23:55,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:23:55,591 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:23:55,591 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:23:55,596 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:23:55,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:23:54" (1/3) ... [2020-10-23 18:23:55,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ddb8c0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:23:55, skipping insertion in model container [2020-10-23 18:23:55,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:23:54" (2/3) ... [2020-10-23 18:23:55,599 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ddb8c0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:23:55, skipping insertion in model container [2020-10-23 18:23:55,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:23:55" (3/3) ... [2020-10-23 18:23:55,601 INFO L111 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-10-23 18:23:55,616 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:23:55,623 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:23:55,639 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:23:55,680 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:23:55,680 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:23:55,680 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:23:55,680 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:23:55,680 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:23:55,681 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:23:55,681 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:23:55,681 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:23:55,706 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-10-23 18:23:55,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-23 18:23:55,716 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:55,717 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:23:55,717 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:55,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:55,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1356734652, now seen corresponding path program 1 times [2020-10-23 18:23:55,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:55,741 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080811930] [2020-10-23 18:23:55,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:55,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:56,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,121 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 18:23:56,121 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080811930] [2020-10-23 18:23:56,122 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:56,123 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:56,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598407115] [2020-10-23 18:23:56,128 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:56,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:56,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:56,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:56,146 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 4 states. [2020-10-23 18:23:56,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:56,368 INFO L93 Difference]: Finished difference Result 74 states and 121 transitions. [2020-10-23 18:23:56,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:56,382 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-10-23 18:23:56,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:56,394 INFO L225 Difference]: With dead ends: 74 [2020-10-23 18:23:56,394 INFO L226 Difference]: Without dead ends: 55 [2020-10-23 18:23:56,398 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 18:23:56,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-10-23 18:23:56,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 40. [2020-10-23 18:23:56,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-23 18:23:56,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 67 transitions. [2020-10-23 18:23:56,448 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 67 transitions. Word has length 19 [2020-10-23 18:23:56,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:56,448 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 67 transitions. [2020-10-23 18:23:56,449 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:56,449 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 67 transitions. [2020-10-23 18:23:56,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-23 18:23:56,450 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:56,450 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:23:56,450 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:23:56,451 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:56,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:56,452 INFO L82 PathProgramCache]: Analyzing trace with hash 2057799230, now seen corresponding path program 1 times [2020-10-23 18:23:56,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:56,452 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601640165] [2020-10-23 18:23:56,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:56,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:56,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,545 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 18:23:56,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601640165] [2020-10-23 18:23:56,546 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:56,546 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:56,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786384299] [2020-10-23 18:23:56,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:56,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:56,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:56,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:56,549 INFO L87 Difference]: Start difference. First operand 40 states and 67 transitions. Second operand 4 states. [2020-10-23 18:23:56,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:56,763 INFO L93 Difference]: Finished difference Result 89 states and 155 transitions. [2020-10-23 18:23:56,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:56,765 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-10-23 18:23:56,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:56,768 INFO L225 Difference]: With dead ends: 89 [2020-10-23 18:23:56,768 INFO L226 Difference]: Without dead ends: 55 [2020-10-23 18:23:56,771 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 18:23:56,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-10-23 18:23:56,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2020-10-23 18:23:56,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-23 18:23:56,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 91 transitions. [2020-10-23 18:23:56,794 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 91 transitions. Word has length 19 [2020-10-23 18:23:56,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:56,795 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 91 transitions. [2020-10-23 18:23:56,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:56,797 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 91 transitions. [2020-10-23 18:23:56,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-23 18:23:56,798 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:56,798 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] [2020-10-23 18:23:56,800 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:23:56,800 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:56,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:56,801 INFO L82 PathProgramCache]: Analyzing trace with hash -884260222, now seen corresponding path program 1 times [2020-10-23 18:23:56,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:56,802 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050134480] [2020-10-23 18:23:56,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:56,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:56,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:56,927 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 18:23:56,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050134480] [2020-10-23 18:23:56,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:56,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:56,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876659125] [2020-10-23 18:23:56,931 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:56,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:56,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:56,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:56,935 INFO L87 Difference]: Start difference. First operand 54 states and 91 transitions. Second operand 4 states. [2020-10-23 18:23:57,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:57,120 INFO L93 Difference]: Finished difference Result 83 states and 138 transitions. [2020-10-23 18:23:57,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:57,121 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-23 18:23:57,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:57,122 INFO L225 Difference]: With dead ends: 83 [2020-10-23 18:23:57,122 INFO L226 Difference]: Without dead ends: 58 [2020-10-23 18:23:57,123 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 18:23:57,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-10-23 18:23:57,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-10-23 18:23:57,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-23 18:23:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 93 transitions. [2020-10-23 18:23:57,135 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 93 transitions. Word has length 20 [2020-10-23 18:23:57,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:57,135 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 93 transitions. [2020-10-23 18:23:57,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:57,136 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 93 transitions. [2020-10-23 18:23:57,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-23 18:23:57,137 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:57,137 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] [2020-10-23 18:23:57,137 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 18:23:57,137 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:57,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:57,138 INFO L82 PathProgramCache]: Analyzing trace with hash -626094784, now seen corresponding path program 1 times [2020-10-23 18:23:57,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:57,138 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737134227] [2020-10-23 18:23:57,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:57,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:57,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,205 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 18:23:57,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737134227] [2020-10-23 18:23:57,205 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:57,206 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:57,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155527040] [2020-10-23 18:23:57,206 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:57,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:57,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:57,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:57,208 INFO L87 Difference]: Start difference. First operand 57 states and 93 transitions. Second operand 4 states. [2020-10-23 18:23:57,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:57,343 INFO L93 Difference]: Finished difference Result 149 states and 254 transitions. [2020-10-23 18:23:57,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:57,344 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-23 18:23:57,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:57,345 INFO L225 Difference]: With dead ends: 149 [2020-10-23 18:23:57,345 INFO L226 Difference]: Without dead ends: 101 [2020-10-23 18:23:57,346 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 18:23:57,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-10-23 18:23:57,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2020-10-23 18:23:57,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-10-23 18:23:57,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 166 transitions. [2020-10-23 18:23:57,359 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 166 transitions. Word has length 20 [2020-10-23 18:23:57,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:57,360 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 166 transitions. [2020-10-23 18:23:57,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:57,360 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 166 transitions. [2020-10-23 18:23:57,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-23 18:23:57,361 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:57,361 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] [2020-10-23 18:23:57,362 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 18:23:57,362 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:57,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:57,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1327159362, now seen corresponding path program 1 times [2020-10-23 18:23:57,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:57,366 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404067691] [2020-10-23 18:23:57,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:57,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:57,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,444 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 18:23:57,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404067691] [2020-10-23 18:23:57,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:57,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:57,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235651017] [2020-10-23 18:23:57,446 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:57,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:57,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:57,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:57,447 INFO L87 Difference]: Start difference. First operand 100 states and 166 transitions. Second operand 4 states. [2020-10-23 18:23:57,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:57,574 INFO L93 Difference]: Finished difference Result 128 states and 213 transitions. [2020-10-23 18:23:57,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:57,575 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-23 18:23:57,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:57,577 INFO L225 Difference]: With dead ends: 128 [2020-10-23 18:23:57,577 INFO L226 Difference]: Without dead ends: 125 [2020-10-23 18:23:57,578 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 18:23:57,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-10-23 18:23:57,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 100. [2020-10-23 18:23:57,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-10-23 18:23:57,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 164 transitions. [2020-10-23 18:23:57,590 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 164 transitions. Word has length 20 [2020-10-23 18:23:57,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:57,590 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 164 transitions. [2020-10-23 18:23:57,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:57,591 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 164 transitions. [2020-10-23 18:23:57,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:23:57,592 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:57,592 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] [2020-10-23 18:23:57,592 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 18:23:57,592 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:57,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:57,593 INFO L82 PathProgramCache]: Analyzing trace with hash 2072547273, now seen corresponding path program 1 times [2020-10-23 18:23:57,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:57,594 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17316757] [2020-10-23 18:23:57,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:57,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,647 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 18:23:57,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17316757] [2020-10-23 18:23:57,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:57,648 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:57,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316987274] [2020-10-23 18:23:57,649 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:57,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:57,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:57,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:57,650 INFO L87 Difference]: Start difference. First operand 100 states and 164 transitions. Second operand 4 states. [2020-10-23 18:23:57,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:57,796 INFO L93 Difference]: Finished difference Result 180 states and 301 transitions. [2020-10-23 18:23:57,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:57,796 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-10-23 18:23:57,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:57,798 INFO L225 Difference]: With dead ends: 180 [2020-10-23 18:23:57,799 INFO L226 Difference]: Without dead ends: 177 [2020-10-23 18:23:57,799 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 18:23:57,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-10-23 18:23:57,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 136. [2020-10-23 18:23:57,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-10-23 18:23:57,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 222 transitions. [2020-10-23 18:23:57,813 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 222 transitions. Word has length 21 [2020-10-23 18:23:57,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:57,813 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 222 transitions. [2020-10-23 18:23:57,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:57,813 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 222 transitions. [2020-10-23 18:23:57,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:23:57,815 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:57,815 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] [2020-10-23 18:23:57,815 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 18:23:57,815 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:57,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:57,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1521355445, now seen corresponding path program 1 times [2020-10-23 18:23:57,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:57,816 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46685525] [2020-10-23 18:23:57,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:57,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:57,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:57,870 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 18:23:57,870 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46685525] [2020-10-23 18:23:57,870 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:57,871 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:57,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044930519] [2020-10-23 18:23:57,871 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:57,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:57,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:57,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:57,873 INFO L87 Difference]: Start difference. First operand 136 states and 222 transitions. Second operand 4 states. [2020-10-23 18:23:58,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:58,002 INFO L93 Difference]: Finished difference Result 312 states and 517 transitions. [2020-10-23 18:23:58,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:58,003 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-10-23 18:23:58,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:58,004 INFO L225 Difference]: With dead ends: 312 [2020-10-23 18:23:58,004 INFO L226 Difference]: Without dead ends: 185 [2020-10-23 18:23:58,006 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 18:23:58,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2020-10-23 18:23:58,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2020-10-23 18:23:58,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-10-23 18:23:58,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 296 transitions. [2020-10-23 18:23:58,021 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 296 transitions. Word has length 21 [2020-10-23 18:23:58,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:58,022 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 296 transitions. [2020-10-23 18:23:58,022 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:58,022 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 296 transitions. [2020-10-23 18:23:58,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 18:23:58,024 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:58,024 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] [2020-10-23 18:23:58,024 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 18:23:58,024 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:58,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:58,025 INFO L82 PathProgramCache]: Analyzing trace with hash -168884309, now seen corresponding path program 1 times [2020-10-23 18:23:58,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:58,026 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931213553] [2020-10-23 18:23:58,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:58,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:58,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,077 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 18:23:58,077 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931213553] [2020-10-23 18:23:58,077 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:58,078 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:58,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69497871] [2020-10-23 18:23:58,078 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:58,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:58,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:58,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:58,079 INFO L87 Difference]: Start difference. First operand 184 states and 296 transitions. Second operand 4 states. [2020-10-23 18:23:58,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:58,206 INFO L93 Difference]: Finished difference Result 278 states and 447 transitions. [2020-10-23 18:23:58,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:58,207 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-10-23 18:23:58,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:58,209 INFO L225 Difference]: With dead ends: 278 [2020-10-23 18:23:58,209 INFO L226 Difference]: Without dead ends: 191 [2020-10-23 18:23:58,210 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 18:23:58,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2020-10-23 18:23:58,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2020-10-23 18:23:58,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-10-23 18:23:58,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 300 transitions. [2020-10-23 18:23:58,223 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 300 transitions. Word has length 22 [2020-10-23 18:23:58,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:58,224 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 300 transitions. [2020-10-23 18:23:58,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:58,224 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 300 transitions. [2020-10-23 18:23:58,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 18:23:58,226 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:58,226 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] [2020-10-23 18:23:58,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-23 18:23:58,227 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:58,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:58,227 INFO L82 PathProgramCache]: Analyzing trace with hash 89281129, now seen corresponding path program 1 times [2020-10-23 18:23:58,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:58,228 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301593911] [2020-10-23 18:23:58,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:58,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:58,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:23:58,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301593911] [2020-10-23 18:23:58,307 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:58,307 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:58,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46472408] [2020-10-23 18:23:58,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:58,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:58,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:58,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:58,309 INFO L87 Difference]: Start difference. First operand 190 states and 300 transitions. Second operand 4 states. [2020-10-23 18:23:58,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:58,479 INFO L93 Difference]: Finished difference Result 334 states and 535 transitions. [2020-10-23 18:23:58,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:58,480 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-10-23 18:23:58,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:58,482 INFO L225 Difference]: With dead ends: 334 [2020-10-23 18:23:58,482 INFO L226 Difference]: Without dead ends: 331 [2020-10-23 18:23:58,483 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 18:23:58,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-10-23 18:23:58,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 266. [2020-10-23 18:23:58,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-10-23 18:23:58,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 412 transitions. [2020-10-23 18:23:58,498 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 412 transitions. Word has length 22 [2020-10-23 18:23:58,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:58,499 INFO L481 AbstractCegarLoop]: Abstraction has 266 states and 412 transitions. [2020-10-23 18:23:58,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:58,499 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 412 transitions. [2020-10-23 18:23:58,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 18:23:58,500 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:58,501 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] [2020-10-23 18:23:58,501 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-23 18:23:58,501 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:58,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:58,502 INFO L82 PathProgramCache]: Analyzing trace with hash 790345707, now seen corresponding path program 1 times [2020-10-23 18:23:58,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:58,502 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459866480] [2020-10-23 18:23:58,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:58,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:58,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,564 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 18:23:58,564 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459866480] [2020-10-23 18:23:58,564 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:58,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:58,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813455988] [2020-10-23 18:23:58,565 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:58,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:58,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:58,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:58,566 INFO L87 Difference]: Start difference. First operand 266 states and 412 transitions. Second operand 4 states. [2020-10-23 18:23:58,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:58,741 INFO L93 Difference]: Finished difference Result 606 states and 943 transitions. [2020-10-23 18:23:58,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:58,741 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-10-23 18:23:58,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:58,746 INFO L225 Difference]: With dead ends: 606 [2020-10-23 18:23:58,746 INFO L226 Difference]: Without dead ends: 355 [2020-10-23 18:23:58,751 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 18:23:58,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2020-10-23 18:23:58,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 354. [2020-10-23 18:23:58,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 354 states. [2020-10-23 18:23:58,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 536 transitions. [2020-10-23 18:23:58,770 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 536 transitions. Word has length 22 [2020-10-23 18:23:58,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:58,772 INFO L481 AbstractCegarLoop]: Abstraction has 354 states and 536 transitions. [2020-10-23 18:23:58,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:58,772 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 536 transitions. [2020-10-23 18:23:58,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-23 18:23:58,776 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:58,776 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] [2020-10-23 18:23:58,776 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-23 18:23:58,776 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:58,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:58,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1520582058, now seen corresponding path program 1 times [2020-10-23 18:23:58,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:58,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530248269] [2020-10-23 18:23:58,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:58,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:58,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:58,867 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 18:23:58,868 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530248269] [2020-10-23 18:23:58,868 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:58,868 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:58,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059604439] [2020-10-23 18:23:58,869 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:58,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:58,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:58,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:58,870 INFO L87 Difference]: Start difference. First operand 354 states and 536 transitions. Second operand 4 states. [2020-10-23 18:23:59,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:59,026 INFO L93 Difference]: Finished difference Result 530 states and 799 transitions. [2020-10-23 18:23:59,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:59,027 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-10-23 18:23:59,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:59,029 INFO L225 Difference]: With dead ends: 530 [2020-10-23 18:23:59,029 INFO L226 Difference]: Without dead ends: 363 [2020-10-23 18:23:59,030 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 18:23:59,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2020-10-23 18:23:59,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 362. [2020-10-23 18:23:59,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 362 states. [2020-10-23 18:23:59,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 536 transitions. [2020-10-23 18:23:59,047 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 536 transitions. Word has length 23 [2020-10-23 18:23:59,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:59,048 INFO L481 AbstractCegarLoop]: Abstraction has 362 states and 536 transitions. [2020-10-23 18:23:59,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:59,048 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 536 transitions. [2020-10-23 18:23:59,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-23 18:23:59,049 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:59,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:23:59,049 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-23 18:23:59,049 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:59,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:59,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1262416620, now seen corresponding path program 1 times [2020-10-23 18:23:59,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:59,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808700901] [2020-10-23 18:23:59,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:59,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:59,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,122 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 18:23:59,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808700901] [2020-10-23 18:23:59,123 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:59,123 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:59,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901760596] [2020-10-23 18:23:59,124 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:59,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:59,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:59,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:59,125 INFO L87 Difference]: Start difference. First operand 362 states and 536 transitions. Second operand 4 states. [2020-10-23 18:23:59,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:59,310 INFO L93 Difference]: Finished difference Result 622 states and 931 transitions. [2020-10-23 18:23:59,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:59,311 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-10-23 18:23:59,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:59,317 INFO L225 Difference]: With dead ends: 622 [2020-10-23 18:23:59,317 INFO L226 Difference]: Without dead ends: 619 [2020-10-23 18:23:59,318 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 18:23:59,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2020-10-23 18:23:59,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 522. [2020-10-23 18:23:59,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 522 states. [2020-10-23 18:23:59,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 752 transitions. [2020-10-23 18:23:59,360 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 752 transitions. Word has length 23 [2020-10-23 18:23:59,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:59,360 INFO L481 AbstractCegarLoop]: Abstraction has 522 states and 752 transitions. [2020-10-23 18:23:59,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:59,360 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 752 transitions. [2020-10-23 18:23:59,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-23 18:23:59,363 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:59,363 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:23:59,364 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-23 18:23:59,365 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:59,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:59,365 INFO L82 PathProgramCache]: Analyzing trace with hash -561352042, now seen corresponding path program 1 times [2020-10-23 18:23:59,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:59,369 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395701105] [2020-10-23 18:23:59,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:59,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:59,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,446 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 18:23:59,447 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395701105] [2020-10-23 18:23:59,447 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:59,447 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:59,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210705547] [2020-10-23 18:23:59,448 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:59,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:59,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:59,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:59,449 INFO L87 Difference]: Start difference. First operand 522 states and 752 transitions. Second operand 4 states. [2020-10-23 18:23:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:59,621 INFO L93 Difference]: Finished difference Result 1182 states and 1699 transitions. [2020-10-23 18:23:59,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:59,622 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-10-23 18:23:59,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:59,626 INFO L225 Difference]: With dead ends: 1182 [2020-10-23 18:23:59,626 INFO L226 Difference]: Without dead ends: 683 [2020-10-23 18:23:59,628 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 18:23:59,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2020-10-23 18:23:59,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 682. [2020-10-23 18:23:59,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2020-10-23 18:23:59,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 952 transitions. [2020-10-23 18:23:59,660 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 952 transitions. Word has length 23 [2020-10-23 18:23:59,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:59,661 INFO L481 AbstractCegarLoop]: Abstraction has 682 states and 952 transitions. [2020-10-23 18:23:59,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:59,661 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 952 transitions. [2020-10-23 18:23:59,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-23 18:23:59,662 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:59,662 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] [2020-10-23 18:23:59,662 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-23 18:23:59,663 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:59,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:59,663 INFO L82 PathProgramCache]: Analyzing trace with hash -473528746, now seen corresponding path program 1 times [2020-10-23 18:23:59,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:59,664 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244135837] [2020-10-23 18:23:59,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:59,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:59,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,719 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 18:23:59,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244135837] [2020-10-23 18:23:59,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:59,720 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:59,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705503739] [2020-10-23 18:23:59,720 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:59,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:59,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:59,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:59,721 INFO L87 Difference]: Start difference. First operand 682 states and 952 transitions. Second operand 4 states. [2020-10-23 18:23:59,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:23:59,870 INFO L93 Difference]: Finished difference Result 1022 states and 1419 transitions. [2020-10-23 18:23:59,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:23:59,871 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-10-23 18:23:59,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:23:59,875 INFO L225 Difference]: With dead ends: 1022 [2020-10-23 18:23:59,875 INFO L226 Difference]: Without dead ends: 699 [2020-10-23 18:23:59,876 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 18:23:59,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2020-10-23 18:23:59,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 698. [2020-10-23 18:23:59,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 698 states. [2020-10-23 18:23:59,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 698 states to 698 states and 952 transitions. [2020-10-23 18:23:59,921 INFO L78 Accepts]: Start accepts. Automaton has 698 states and 952 transitions. Word has length 24 [2020-10-23 18:23:59,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:23:59,922 INFO L481 AbstractCegarLoop]: Abstraction has 698 states and 952 transitions. [2020-10-23 18:23:59,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:23:59,922 INFO L276 IsEmpty]: Start isEmpty. Operand 698 states and 952 transitions. [2020-10-23 18:23:59,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-23 18:23:59,923 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:23:59,923 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] [2020-10-23 18:23:59,924 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-23 18:23:59,924 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:23:59,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:23:59,924 INFO L82 PathProgramCache]: Analyzing trace with hash -215363308, now seen corresponding path program 1 times [2020-10-23 18:23:59,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:23:59,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042594167] [2020-10-23 18:23:59,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:23:59,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:23:59,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:23:59,975 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 18:23:59,975 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042594167] [2020-10-23 18:23:59,976 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:23:59,976 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:23:59,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427315575] [2020-10-23 18:23:59,976 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:23:59,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:23:59,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:23:59,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:23:59,977 INFO L87 Difference]: Start difference. First operand 698 states and 952 transitions. Second operand 4 states. [2020-10-23 18:24:00,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:24:00,132 INFO L93 Difference]: Finished difference Result 1166 states and 1595 transitions. [2020-10-23 18:24:00,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:24:00,133 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-10-23 18:24:00,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:24:00,139 INFO L225 Difference]: With dead ends: 1166 [2020-10-23 18:24:00,139 INFO L226 Difference]: Without dead ends: 1163 [2020-10-23 18:24:00,140 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 18:24:00,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1163 states. [2020-10-23 18:24:00,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1163 to 1034. [2020-10-23 18:24:00,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1034 states. [2020-10-23 18:24:00,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1368 transitions. [2020-10-23 18:24:00,185 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1368 transitions. Word has length 24 [2020-10-23 18:24:00,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:24:00,185 INFO L481 AbstractCegarLoop]: Abstraction has 1034 states and 1368 transitions. [2020-10-23 18:24:00,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:24:00,185 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1368 transitions. [2020-10-23 18:24:00,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-23 18:24:00,188 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:24:00,188 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] [2020-10-23 18:24:00,188 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-23 18:24:00,188 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:24:00,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:24:00,189 INFO L82 PathProgramCache]: Analyzing trace with hash 485701270, now seen corresponding path program 1 times [2020-10-23 18:24:00,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:24:00,189 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985315149] [2020-10-23 18:24:00,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:24:00,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:24:00,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,237 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 18:24:00,238 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985315149] [2020-10-23 18:24:00,238 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:24:00,238 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:24:00,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352085187] [2020-10-23 18:24:00,239 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:24:00,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:24:00,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:24:00,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:24:00,240 INFO L87 Difference]: Start difference. First operand 1034 states and 1368 transitions. Second operand 4 states. [2020-10-23 18:24:00,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:24:00,408 INFO L93 Difference]: Finished difference Result 2318 states and 3035 transitions. [2020-10-23 18:24:00,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:24:00,408 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-10-23 18:24:00,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:24:00,415 INFO L225 Difference]: With dead ends: 2318 [2020-10-23 18:24:00,415 INFO L226 Difference]: Without dead ends: 1323 [2020-10-23 18:24:00,417 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 18:24:00,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1323 states. [2020-10-23 18:24:00,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1323 to 1322. [2020-10-23 18:24:00,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1322 states. [2020-10-23 18:24:00,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1322 states to 1322 states and 1672 transitions. [2020-10-23 18:24:00,494 INFO L78 Accepts]: Start accepts. Automaton has 1322 states and 1672 transitions. Word has length 24 [2020-10-23 18:24:00,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:24:00,494 INFO L481 AbstractCegarLoop]: Abstraction has 1322 states and 1672 transitions. [2020-10-23 18:24:00,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:24:00,494 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states and 1672 transitions. [2020-10-23 18:24:00,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 18:24:00,497 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:24:00,497 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] [2020-10-23 18:24:00,497 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-23 18:24:00,497 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:24:00,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:24:00,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1920363425, now seen corresponding path program 1 times [2020-10-23 18:24:00,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:24:00,498 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342224383] [2020-10-23 18:24:00,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:24:00,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:24:00,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,550 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 18:24:00,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342224383] [2020-10-23 18:24:00,551 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:24:00,551 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:24:00,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738048801] [2020-10-23 18:24:00,551 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:24:00,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:24:00,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:24:00,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:24:00,552 INFO L87 Difference]: Start difference. First operand 1322 states and 1672 transitions. Second operand 4 states. [2020-10-23 18:24:00,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:24:00,710 INFO L93 Difference]: Finished difference Result 1982 states and 2491 transitions. [2020-10-23 18:24:00,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:24:00,711 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-10-23 18:24:00,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:24:00,718 INFO L225 Difference]: With dead ends: 1982 [2020-10-23 18:24:00,718 INFO L226 Difference]: Without dead ends: 1355 [2020-10-23 18:24:00,720 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 18:24:00,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1355 states. [2020-10-23 18:24:00,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1355 to 1354. [2020-10-23 18:24:00,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1354 states. [2020-10-23 18:24:00,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1354 states to 1354 states and 1672 transitions. [2020-10-23 18:24:00,777 INFO L78 Accepts]: Start accepts. Automaton has 1354 states and 1672 transitions. Word has length 25 [2020-10-23 18:24:00,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:24:00,777 INFO L481 AbstractCegarLoop]: Abstraction has 1354 states and 1672 transitions. [2020-10-23 18:24:00,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:24:00,778 INFO L276 IsEmpty]: Start isEmpty. Operand 1354 states and 1672 transitions. [2020-10-23 18:24:00,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 18:24:00,780 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:24:00,780 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] [2020-10-23 18:24:00,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-23 18:24:00,780 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:24:00,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:24:00,781 INFO L82 PathProgramCache]: Analyzing trace with hash -2116438433, now seen corresponding path program 1 times [2020-10-23 18:24:00,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:24:00,781 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589673939] [2020-10-23 18:24:00,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:24:00,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:24:00,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:00,829 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 18:24:00,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589673939] [2020-10-23 18:24:00,829 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:24:00,830 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:24:00,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409947715] [2020-10-23 18:24:00,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:24:00,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:24:00,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:24:00,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:24:00,831 INFO L87 Difference]: Start difference. First operand 1354 states and 1672 transitions. Second operand 4 states. [2020-10-23 18:24:01,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:24:01,025 INFO L93 Difference]: Finished difference Result 2189 states and 2666 transitions. [2020-10-23 18:24:01,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:24:01,025 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-10-23 18:24:01,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:24:01,035 INFO L225 Difference]: With dead ends: 2189 [2020-10-23 18:24:01,036 INFO L226 Difference]: Without dead ends: 2186 [2020-10-23 18:24:01,037 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 18:24:01,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2020-10-23 18:24:01,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2058. [2020-10-23 18:24:01,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2058 states. [2020-10-23 18:24:01,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2058 states to 2058 states and 2472 transitions. [2020-10-23 18:24:01,126 INFO L78 Accepts]: Start accepts. Automaton has 2058 states and 2472 transitions. Word has length 25 [2020-10-23 18:24:01,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:24:01,126 INFO L481 AbstractCegarLoop]: Abstraction has 2058 states and 2472 transitions. [2020-10-23 18:24:01,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:24:01,127 INFO L276 IsEmpty]: Start isEmpty. Operand 2058 states and 2472 transitions. [2020-10-23 18:24:01,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 18:24:01,130 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:24:01,131 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] [2020-10-23 18:24:01,131 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-23 18:24:01,131 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:24:01,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:24:01,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1415373855, now seen corresponding path program 1 times [2020-10-23 18:24:01,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:24:01,132 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287267244] [2020-10-23 18:24:01,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:24:01,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:01,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:24:01,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:24:01,184 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 18:24:01,185 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287267244] [2020-10-23 18:24:01,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:24:01,185 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:24:01,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230997604] [2020-10-23 18:24:01,186 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:24:01,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:24:01,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:24:01,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:24:01,187 INFO L87 Difference]: Start difference. First operand 2058 states and 2472 transitions. Second operand 4 states. [2020-10-23 18:24:01,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:24:01,373 INFO L93 Difference]: Finished difference Result 4554 states and 5352 transitions. [2020-10-23 18:24:01,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:24:01,374 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-10-23 18:24:01,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:24:01,374 INFO L225 Difference]: With dead ends: 4554 [2020-10-23 18:24:01,374 INFO L226 Difference]: Without dead ends: 0 [2020-10-23 18:24:01,381 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 18:24:01,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-10-23 18:24:01,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-10-23 18:24:01,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-10-23 18:24:01,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-10-23 18:24:01,382 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-10-23 18:24:01,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:24:01,382 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-23 18:24:01,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:24:01,382 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-10-23 18:24:01,383 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-10-23 18:24:01,383 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-23 18:24:01,385 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-10-23 18:24:03,292 WARN L193 SmtUtils]: Spent 1.88 s on a formula simplification. DAG size of input: 576 DAG size of output: 32 [2020-10-23 18:24:03,345 INFO L274 CegarLoopResult]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2020-10-23 18:24:03,346 INFO L277 CegarLoopResult]: At program point reach_errorENTRY(line 3) the Hoare annotation is: true [2020-10-23 18:24:03,346 INFO L274 CegarLoopResult]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2020-10-23 18:24:03,346 INFO L274 CegarLoopResult]: For program point reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-10-23 18:24:03,346 INFO L274 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-10-23 18:24:03,346 INFO L270 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-10-23 18:24:03,346 INFO L274 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-10-23 18:24:03,347 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-10-23 18:24:03,347 INFO L277 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-10-23 18:24:03,347 INFO L277 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-10-23 18:24:03,347 INFO L274 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-10-23 18:24:03,347 INFO L274 CegarLoopResult]: For program point L93-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point mainEXIT(lines 6 123) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point L77-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point L69-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point L94(line 94) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point L61-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,348 INFO L277 CegarLoopResult]: At program point L119(lines 7 123) the Hoare annotation is: true [2020-10-23 18:24:03,348 INFO L274 CegarLoopResult]: For program point L53(lines 53 55) no Hoare annotation was computed. [2020-10-23 18:24:03,349 INFO L274 CegarLoopResult]: For program point L53-2(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,349 INFO L274 CegarLoopResult]: For program point L103-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,349 INFO L274 CegarLoopResult]: For program point mainFINAL(lines 6 123) no Hoare annotation was computed. [2020-10-23 18:24:03,349 INFO L274 CegarLoopResult]: For program point L104(line 104) no Hoare annotation was computed. [2020-10-23 18:24:03,349 INFO L277 CegarLoopResult]: At program point mainENTRY(lines 6 123) the Hoare annotation is: true [2020-10-23 18:24:03,350 INFO L274 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-10-23 18:24:03,350 INFO L274 CegarLoopResult]: For program point L88-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,350 INFO L277 CegarLoopResult]: At program point L113-1(lines 32 118) the Hoare annotation is: true [2020-10-23 18:24:03,350 INFO L274 CegarLoopResult]: For program point L89(line 89) no Hoare annotation was computed. [2020-10-23 18:24:03,350 INFO L274 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-10-23 18:24:03,350 INFO L270 CegarLoopResult]: At program point L114-1(lines 7 123) the Hoare annotation is: false [2020-10-23 18:24:03,350 INFO L274 CegarLoopResult]: For program point L73-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L98-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L65-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L57-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L99(line 99) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L83-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L108-1(lines 32 118) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L34(lines 34 36) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L84(line 84) no Hoare annotation was computed. [2020-10-23 18:24:03,351 INFO L274 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-10-23 18:24:03,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:24:03 BoogieIcfgContainer [2020-10-23 18:24:03,368 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:24:03,372 INFO L168 Benchmark]: Toolchain (without parser) took 8819.67 ms. Allocated memory was 157.3 MB in the beginning and 272.6 MB in the end (delta: 115.3 MB). Free memory was 132.8 MB in the beginning and 161.0 MB in the end (delta: -28.2 MB). Peak memory consumption was 129.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:24:03,376 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 125.8 MB. Free memory was 100.9 MB in the beginning and 100.8 MB in the end (delta: 125.9 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:24:03,377 INFO L168 Benchmark]: CACSL2BoogieTranslator took 271.77 ms. Allocated memory is still 157.3 MB. Free memory was 132.2 MB in the beginning and 122.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:24:03,380 INFO L168 Benchmark]: Boogie Preprocessor took 41.49 ms. Allocated memory is still 157.3 MB. Free memory was 122.5 MB in the beginning and 120.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:24:03,381 INFO L168 Benchmark]: RCFGBuilder took 715.52 ms. Allocated memory is still 157.3 MB. Free memory was 120.8 MB in the beginning and 136.3 MB in the end (delta: -15.4 MB). Peak memory consumption was 16.3 MB. Max. memory is 8.0 GB. [2020-10-23 18:24:03,381 INFO L168 Benchmark]: TraceAbstraction took 7776.91 ms. Allocated memory was 157.3 MB in the beginning and 272.6 MB in the end (delta: 115.3 MB). Free memory was 135.7 MB in the beginning and 161.0 MB in the end (delta: -25.3 MB). Peak memory consumption was 130.9 MB. Max. memory is 8.0 GB. [2020-10-23 18:24:03,388 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 125.8 MB. Free memory was 100.9 MB in the beginning and 100.8 MB in the end (delta: 125.9 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 271.77 ms. Allocated memory is still 157.3 MB. Free memory was 132.2 MB in the beginning and 122.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 41.49 ms. Allocated memory is still 157.3 MB. Free memory was 122.5 MB in the beginning and 120.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 715.52 ms. Allocated memory is still 157.3 MB. Free memory was 120.8 MB in the beginning and 136.3 MB in the end (delta: -15.4 MB). Peak memory consumption was 16.3 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7776.91 ms. Allocated memory was 157.3 MB in the beginning and 272.6 MB in the end (delta: 115.3 MB). Free memory was 135.7 MB in the beginning and 161.0 MB in the end (delta: -25.3 MB). Peak memory consumption was 130.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 7]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 7]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 32]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5.7s, OverallIterations: 19, TraceHistogramMax: 1, AutomataDifference: 3.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1205 SDtfs, 1671 SDslu, 148 SDs, 0 SdLazy, 868 SolverSat, 68 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 133 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2058occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 19 MinimizatonAttempts, 511 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 26 PreInvPairs, 157 NumberOfFragments, 38 HoareAnnotationTreeSize, 26 FomulaSimplifications, 854054 FormulaSimplificationTreeSizeReduction, 1.9s HoareSimplificationTime, 8 FomulaSimplificationsInter, 90 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 422 NumberOfCodeBlocks, 422 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 403 ConstructedInterpolants, 0 QuantifiedInterpolants, 27410 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 19 InterpolantComputations, 19 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...