/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 06:35:02,860 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 06:35:02,863 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 06:35:02,902 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-07 06:35:02,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 06:35:02,924 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 06:35:02,925 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 06:35:02,927 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 06:35:02,928 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 06:35:02,929 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 06:35:02,931 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 06:35:02,934 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 06:35:02,935 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 06:35:02,937 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 06:35:02,938 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 06:35:02,939 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 06:35:02,943 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 06:35:02,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 06:35:02,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 06:35:02,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 06:35:02,964 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 06:35:02,976 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 06:35:02,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 06:35:02,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 06:35:02,978 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 06:35:02,978 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 06:35:02,979 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 06:35:02,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 06:35:02,980 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 06:35:02,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 06:35:02,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 06:35:02,980 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 06:35:02,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 06:35:02,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 06:35:02,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:35:02,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 06:35:02,981 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 06:35:02,982 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 06:35:02,982 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 06:35:03,357 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 06:35:03,418 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 06:35:03,422 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 06:35:03,423 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 06:35:03,424 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 06:35:03,425 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-11-07 06:35:03,516 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c9148ccc/aa9d8bb943c24c82a5e2aeaf29a86150/FLAG87c1f3a04 [2020-11-07 06:35:04,139 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 06:35:04,140 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-11-07 06:35:04,147 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c9148ccc/aa9d8bb943c24c82a5e2aeaf29a86150/FLAG87c1f3a04 [2020-11-07 06:35:04,513 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c9148ccc/aa9d8bb943c24c82a5e2aeaf29a86150 [2020-11-07 06:35:04,516 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 06:35:04,523 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 06:35:04,525 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 06:35:04,525 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 06:35:04,530 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 06:35:04,530 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,534 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a2ecc65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04, skipping insertion in model container [2020-11-07 06:35:04,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,543 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 06:35:04,559 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 06:35:04,788 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:35:04,799 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 06:35:04,823 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:35:04,841 INFO L208 MainTranslator]: Completed translation [2020-11-07 06:35:04,841 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04 WrapperNode [2020-11-07 06:35:04,841 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 06:35:04,843 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 06:35:04,843 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 06:35:04,843 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 06:35:04,857 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,867 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,876 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,882 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,884 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,887 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 06:35:04,892 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 06:35:04,893 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 06:35:04,893 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 06:35:04,894 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (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 [2020-11-07 06:35:04,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 06:35:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 06:35:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 06:35:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-07 06:35:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 06:35:04,987 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-07 06:35:04,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-11-07 06:35:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 06:35:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 06:35:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 06:35:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 06:35:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 06:35:04,990 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 06:35:04,990 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 06:35:05,469 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 06:35:05,470 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-11-07 06:35:05,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:35:05 BoogieIcfgContainer [2020-11-07 06:35:05,472 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 06:35:05,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 06:35:05,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 06:35:05,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 06:35:05,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 06:35:04" (1/3) ... [2020-11-07 06:35:05,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5428aac4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:35:05, skipping insertion in model container [2020-11-07 06:35:05,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (2/3) ... [2020-11-07 06:35:05,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5428aac4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:35:05, skipping insertion in model container [2020-11-07 06:35:05,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:35:05" (3/3) ... [2020-11-07 06:35:05,481 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-07 06:35:05,500 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 06:35:05,505 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 06:35:05,519 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 06:35:05,563 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 06:35:05,563 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 06:35:05,563 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 06:35:05,564 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 06:35:05,564 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 06:35:05,564 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 06:35:05,564 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 06:35:05,564 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 06:35:05,594 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-11-07 06:35:05,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-07 06:35:05,609 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:05,610 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:05,610 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:05,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:05,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1377275012, now seen corresponding path program 1 times [2020-11-07 06:35:05,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:05,632 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604518851] [2020-11-07 06:35:05,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:05,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:06,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,042 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:06,043 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604518851] [2020-11-07 06:35:06,046 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:06,046 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-07 06:35:06,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26283449] [2020-11-07 06:35:06,052 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-07 06:35:06,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:06,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-07 06:35:06,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:35:06,071 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 3 states. [2020-11-07 06:35:06,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:06,297 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2020-11-07 06:35:06,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-07 06:35:06,299 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 37 [2020-11-07 06:35:06,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:06,309 INFO L225 Difference]: With dead ends: 131 [2020-11-07 06:35:06,309 INFO L226 Difference]: Without dead ends: 63 [2020-11-07 06:35:06,313 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:35:06,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-11-07 06:35:06,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-11-07 06:35:06,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-11-07 06:35:06,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-11-07 06:35:06,368 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 37 [2020-11-07 06:35:06,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:06,368 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-11-07 06:35:06,369 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-07 06:35:06,369 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-11-07 06:35:06,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-07 06:35:06,371 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:06,371 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:06,371 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 06:35:06,371 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:06,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:06,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1392960477, now seen corresponding path program 1 times [2020-11-07 06:35:06,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:06,373 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101524791] [2020-11-07 06:35:06,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:06,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:06,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:06,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101524791] [2020-11-07 06:35:06,523 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:06,523 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-07 06:35:06,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65165976] [2020-11-07 06:35:06,525 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-07 06:35:06,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:06,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-07 06:35:06,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:35:06,526 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 5 states. [2020-11-07 06:35:06,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:06,763 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-11-07 06:35:06,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-07 06:35:06,764 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2020-11-07 06:35:06,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:06,768 INFO L225 Difference]: With dead ends: 114 [2020-11-07 06:35:06,768 INFO L226 Difference]: Without dead ends: 80 [2020-11-07 06:35:06,770 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:35:06,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-07 06:35:06,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 64. [2020-11-07 06:35:06,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-11-07 06:35:06,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-11-07 06:35:06,792 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 37 [2020-11-07 06:35:06,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:06,792 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-11-07 06:35:06,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-07 06:35:06,793 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-11-07 06:35:06,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-11-07 06:35:06,794 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:06,794 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:06,795 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 06:35:06,795 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:06,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:06,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1809621749, now seen corresponding path program 1 times [2020-11-07 06:35:06,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:06,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267193799] [2020-11-07 06:35:06,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:06,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:06,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-07 06:35:06,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267193799] [2020-11-07 06:35:06,915 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:06,915 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-07 06:35:06,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602475777] [2020-11-07 06:35:06,916 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-07 06:35:06,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:06,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-07 06:35:06,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:35:06,917 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 5 states. [2020-11-07 06:35:07,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:07,119 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2020-11-07 06:35:07,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-07 06:35:07,120 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-11-07 06:35:07,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:07,121 INFO L225 Difference]: With dead ends: 102 [2020-11-07 06:35:07,122 INFO L226 Difference]: Without dead ends: 81 [2020-11-07 06:35:07,123 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-11-07 06:35:07,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-11-07 06:35:07,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 65. [2020-11-07 06:35:07,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-11-07 06:35:07,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2020-11-07 06:35:07,138 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 44 [2020-11-07 06:35:07,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:07,138 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2020-11-07 06:35:07,138 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-07 06:35:07,138 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2020-11-07 06:35:07,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-11-07 06:35:07,140 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:07,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:07,140 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 06:35:07,141 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:07,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:07,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1119668411, now seen corresponding path program 1 times [2020-11-07 06:35:07,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:07,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21563320] [2020-11-07 06:35:07,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:07,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:07,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,877 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:07,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21563320] [2020-11-07 06:35:07,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:07,878 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-11-07 06:35:07,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997750630] [2020-11-07 06:35:07,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-07 06:35:07,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:07,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-07 06:35:07,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2020-11-07 06:35:07,881 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 19 states. [2020-11-07 06:35:09,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:09,595 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-11-07 06:35:09,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-11-07 06:35:09,596 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-11-07 06:35:09,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:09,599 INFO L225 Difference]: With dead ends: 171 [2020-11-07 06:35:09,599 INFO L226 Difference]: Without dead ends: 168 [2020-11-07 06:35:09,600 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=355, Invalid=1367, Unknown=0, NotChecked=0, Total=1722 [2020-11-07 06:35:09,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-11-07 06:35:09,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 96. [2020-11-07 06:35:09,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-11-07 06:35:09,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2020-11-07 06:35:09,635 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 54 [2020-11-07 06:35:09,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:09,635 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2020-11-07 06:35:09,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-07 06:35:09,636 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2020-11-07 06:35:09,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-11-07 06:35:09,638 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:09,638 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:09,638 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 06:35:09,638 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:09,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:09,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1813373789, now seen corresponding path program 2 times [2020-11-07 06:35:09,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:09,640 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974230431] [2020-11-07 06:35:09,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:09,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:09,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:09,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:09,818 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:09,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974230431] [2020-11-07 06:35:09,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:09,820 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-11-07 06:35:09,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702724628] [2020-11-07 06:35:09,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-07 06:35:09,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:09,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-07 06:35:09,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-11-07 06:35:09,823 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand 9 states. [2020-11-07 06:35:10,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:10,311 INFO L93 Difference]: Finished difference Result 178 states and 187 transitions. [2020-11-07 06:35:10,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-07 06:35:10,311 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-11-07 06:35:10,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:10,315 INFO L225 Difference]: With dead ends: 178 [2020-11-07 06:35:10,315 INFO L226 Difference]: Without dead ends: 157 [2020-11-07 06:35:10,316 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-11-07 06:35:10,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-11-07 06:35:10,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 106. [2020-11-07 06:35:10,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-11-07 06:35:10,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2020-11-07 06:35:10,343 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 61 [2020-11-07 06:35:10,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:10,344 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2020-11-07 06:35:10,344 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-07 06:35:10,344 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2020-11-07 06:35:10,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-11-07 06:35:10,346 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:10,346 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:10,346 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 06:35:10,347 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:10,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:10,347 INFO L82 PathProgramCache]: Analyzing trace with hash -945090305, now seen corresponding path program 3 times [2020-11-07 06:35:10,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:10,348 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007257898] [2020-11-07 06:35:10,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:10,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:10,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:10,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:10,529 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:10,529 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007257898] [2020-11-07 06:35:10,531 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:10,531 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:35:10,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977977011] [2020-11-07 06:35:10,533 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:35:10,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:10,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:35:10,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:35:10,536 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand 10 states. [2020-11-07 06:35:10,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:10,978 INFO L93 Difference]: Finished difference Result 172 states and 179 transitions. [2020-11-07 06:35:10,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-07 06:35:10,983 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-11-07 06:35:10,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:10,985 INFO L225 Difference]: With dead ends: 172 [2020-11-07 06:35:10,985 INFO L226 Difference]: Without dead ends: 141 [2020-11-07 06:35:10,986 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-11-07 06:35:10,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-11-07 06:35:11,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 106. [2020-11-07 06:35:11,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-11-07 06:35:11,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 109 transitions. [2020-11-07 06:35:11,025 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 109 transitions. Word has length 64 [2020-11-07 06:35:11,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:11,025 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 109 transitions. [2020-11-07 06:35:11,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:35:11,025 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 109 transitions. [2020-11-07 06:35:11,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-11-07 06:35:11,027 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:11,027 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:11,028 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 06:35:11,028 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:11,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:11,029 INFO L82 PathProgramCache]: Analyzing trace with hash -2070432673, now seen corresponding path program 1 times [2020-11-07 06:35:11,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:11,029 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972955376] [2020-11-07 06:35:11,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:11,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:11,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:11,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:11,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-11-07 06:35:11,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:11,169 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-07 06:35:11,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972955376] [2020-11-07 06:35:11,170 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:11,170 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:35:11,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65924499] [2020-11-07 06:35:11,171 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:35:11,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:11,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:35:11,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:35:11,172 INFO L87 Difference]: Start difference. First operand 106 states and 109 transitions. Second operand 10 states. [2020-11-07 06:35:11,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:11,556 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2020-11-07 06:35:11,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-07 06:35:11,557 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-11-07 06:35:11,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:11,559 INFO L225 Difference]: With dead ends: 150 [2020-11-07 06:35:11,559 INFO L226 Difference]: Without dead ends: 98 [2020-11-07 06:35:11,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-11-07 06:35:11,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-11-07 06:35:11,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 82. [2020-11-07 06:35:11,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-11-07 06:35:11,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-11-07 06:35:11,581 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 70 [2020-11-07 06:35:11,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:11,583 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-11-07 06:35:11,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:35:11,583 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-11-07 06:35:11,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-11-07 06:35:11,588 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:11,588 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:11,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-07 06:35:11,589 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:11,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:11,590 INFO L82 PathProgramCache]: Analyzing trace with hash 898072343, now seen corresponding path program 4 times [2020-11-07 06:35:11,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:11,591 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [913738688] [2020-11-07 06:35:11,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:11,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:12,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:12,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:12,512 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:12,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [913738688] [2020-11-07 06:35:12,513 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:12,513 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-11-07 06:35:12,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058820682] [2020-11-07 06:35:12,514 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-07 06:35:12,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:12,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-07 06:35:12,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2020-11-07 06:35:12,515 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 23 states. [2020-11-07 06:35:14,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:14,808 INFO L93 Difference]: Finished difference Result 198 states and 207 transitions. [2020-11-07 06:35:14,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-11-07 06:35:14,810 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2020-11-07 06:35:14,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:14,812 INFO L225 Difference]: With dead ends: 198 [2020-11-07 06:35:14,813 INFO L226 Difference]: Without dead ends: 195 [2020-11-07 06:35:14,816 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=499, Invalid=2693, Unknown=0, NotChecked=0, Total=3192 [2020-11-07 06:35:14,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-11-07 06:35:14,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 123. [2020-11-07 06:35:14,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-11-07 06:35:14,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2020-11-07 06:35:14,842 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 71 [2020-11-07 06:35:14,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:14,842 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2020-11-07 06:35:14,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-07 06:35:14,842 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2020-11-07 06:35:14,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-11-07 06:35:14,844 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:14,844 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:14,844 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-07 06:35:14,845 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:14,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:14,845 INFO L82 PathProgramCache]: Analyzing trace with hash 915375615, now seen corresponding path program 5 times [2020-11-07 06:35:14,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:14,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217472360] [2020-11-07 06:35:14,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:14,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:14,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:14,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:14,996 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:14,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217472360] [2020-11-07 06:35:14,996 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:14,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-11-07 06:35:14,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66238088] [2020-11-07 06:35:14,997 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-07 06:35:14,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:14,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-07 06:35:14,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:35:14,999 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand 12 states. [2020-11-07 06:35:15,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:15,627 INFO L93 Difference]: Finished difference Result 200 states and 209 transitions. [2020-11-07 06:35:15,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-07 06:35:15,628 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 78 [2020-11-07 06:35:15,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:15,629 INFO L225 Difference]: With dead ends: 200 [2020-11-07 06:35:15,630 INFO L226 Difference]: Without dead ends: 179 [2020-11-07 06:35:15,632 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:35:15,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-11-07 06:35:15,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 133. [2020-11-07 06:35:15,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-11-07 06:35:15,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 137 transitions. [2020-11-07 06:35:15,667 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 137 transitions. Word has length 78 [2020-11-07 06:35:15,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:15,668 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 137 transitions. [2020-11-07 06:35:15,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-07 06:35:15,669 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 137 transitions. [2020-11-07 06:35:15,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-11-07 06:35:15,678 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:15,678 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:15,678 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-07 06:35:15,679 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:15,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:15,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1276983889, now seen corresponding path program 6 times [2020-11-07 06:35:15,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:15,680 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816754153] [2020-11-07 06:35:15,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:15,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:15,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:15,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:15,895 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 33 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:15,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816754153] [2020-11-07 06:35:15,896 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:15,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-11-07 06:35:15,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226406050] [2020-11-07 06:35:15,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-07 06:35:15,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:15,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-07 06:35:15,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-11-07 06:35:15,899 INFO L87 Difference]: Start difference. First operand 133 states and 137 transitions. Second operand 13 states. [2020-11-07 06:35:16,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:16,402 INFO L93 Difference]: Finished difference Result 199 states and 206 transitions. [2020-11-07 06:35:16,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-07 06:35:16,402 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 81 [2020-11-07 06:35:16,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:16,404 INFO L225 Difference]: With dead ends: 199 [2020-11-07 06:35:16,404 INFO L226 Difference]: Without dead ends: 168 [2020-11-07 06:35:16,407 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-11-07 06:35:16,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-11-07 06:35:16,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 133. [2020-11-07 06:35:16,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-11-07 06:35:16,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 136 transitions. [2020-11-07 06:35:16,432 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 136 transitions. Word has length 81 [2020-11-07 06:35:16,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:16,434 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 136 transitions. [2020-11-07 06:35:16,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-07 06:35:16,434 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 136 transitions. [2020-11-07 06:35:16,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-11-07 06:35:16,435 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:16,436 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:16,436 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-07 06:35:16,436 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:16,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:16,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1019615281, now seen corresponding path program 2 times [2020-11-07 06:35:16,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:16,439 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916709589] [2020-11-07 06:35:16,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:16,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:35:16,493 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:35:16,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:35:16,541 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:35:16,581 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 06:35:16,581 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 06:35:16,581 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-11-07 06:35:16,648 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 06:35:16 BoogieIcfgContainer [2020-11-07 06:35:16,648 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 06:35:16,651 INFO L168 Benchmark]: Toolchain (without parser) took 12132.26 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 127.0 MB in the beginning and 117.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 121.6 MB. Max. memory is 8.0 GB. [2020-11-07 06:35:16,652 INFO L168 Benchmark]: CDTParser took 1.12 ms. Allocated memory is still 151.0 MB. Free memory is still 124.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 06:35:16,653 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.03 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 116.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-07 06:35:16,653 INFO L168 Benchmark]: Boogie Preprocessor took 44.74 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 114.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-07 06:35:16,654 INFO L168 Benchmark]: RCFGBuilder took 579.93 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 131.0 MB in the end (delta: -16.4 MB). Peak memory consumption was 20.7 MB. Max. memory is 8.0 GB. [2020-11-07 06:35:16,655 INFO L168 Benchmark]: TraceAbstraction took 11174.62 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 130.5 MB in the beginning and 117.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 124.0 MB. Max. memory is 8.0 GB. [2020-11-07 06:35:16,659 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.12 ms. Allocated memory is still 151.0 MB. Free memory is still 124.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 317.03 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 116.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 44.74 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 114.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 579.93 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 131.0 MB in the end (delta: -16.4 MB). Peak memory consumption was 20.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 11174.62 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 130.5 MB in the beginning and 117.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 124.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); VAL [__VERIFIER_nondet_uint()=2, MAX=2] [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; VAL [MAX=2, str1={7:0}, str2={3:0}] [L19] int cont, i, j; VAL [MAX=2, str1={7:0}, str2={3:0}] [L20] cont = 0 VAL [cont=0, MAX=2, str1={7:0}, str2={3:0}] [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={7:0}, str2={3:0}] [L22] COND TRUE i= 0 VAL [cont=0, i=1, j=0, MAX=2, str1={7:0}, str2={3:0}] [L30] EXPR str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={7:0}, str1[0]=-1, str2={3:0}] [L30] str2[j] = str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={7:0}, str1[0]=-1, str2={3:0}] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={7:0}, str2={3:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str2={3:0}] [L29] COND TRUE i >= 0 VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str2={3:0}] [L30] EXPR str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str1[0]=-1, str2={3:0}] [L30] str2[j] = str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str1[0]=-1, str2={3:0}] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={7:0}, str2={3:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={7:0}, str2={3:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={7:0}, str2={3:0}] [L34] j = MAX-1 VAL [cont=0, i=-1, j=1, MAX=2, str1={7:0}, str2={3:0}] [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str2={3:0}] [L35] COND TRUE i