/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_1b.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:05:58,772 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:05:58,783 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:05:58,807 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 19:05:58,843 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:05:58,851 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:05:58,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:05:58,853 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:05:58,853 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:05:58,853 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:05:58,853 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:05:58,853 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:05:58,853 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:05:58,854 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:05:58,854 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:05:58,855 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:05:58,855 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:05:58,855 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:05:58,856 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:05:58,864 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:05:59,081 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:05:59,100 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:05:59,102 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:05:59,102 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:05:59,103 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:05:59,103 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_1b.c [2021-05-02 19:05:59,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27f77c0e9/264702cf85a84b5a8a93507f90d7927b/FLAG28bfdad0b [2021-05-02 19:05:59,472 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:05:59,473 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c [2021-05-02 19:05:59,477 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27f77c0e9/264702cf85a84b5a8a93507f90d7927b/FLAG28bfdad0b [2021-05-02 19:05:59,902 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27f77c0e9/264702cf85a84b5a8a93507f90d7927b [2021-05-02 19:05:59,904 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:05:59,906 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:05:59,909 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:05:59,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:05:59,912 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:05:59,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:05:59" (1/1) ... [2021-05-02 19:05:59,914 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d72cff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:05:59, skipping insertion in model container [2021-05-02 19:05:59,914 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:05:59" (1/1) ... [2021-05-02 19:05:59,919 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:05:59,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:06:00,011 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c[674,687] [2021-05-02 19:06:00,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:00,023 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:06:00,035 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c[674,687] [2021-05-02 19:06:00,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:00,045 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:06:00,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00 WrapperNode [2021-05-02 19:06:00,046 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:00,047 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:06:00,047 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:06:00,047 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:06:00,067 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,067 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,071 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,071 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,074 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,076 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,081 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:06:00,081 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:06:00,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:06:00,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:06:00,082 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (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 [2021-05-02 19:06:00,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:06:00,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:06:00,215 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:06:00,215 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:06:00,216 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:06:00,217 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:06:00,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:06:00,397 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:06:00,397 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:06:00,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:00 BoogieIcfgContainer [2021-05-02 19:06:00,398 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:06:00,399 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:06:00,399 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:06:00,399 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:06:00,401 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:00" (1/1) ... [2021-05-02 19:06:00,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:00 BasicIcfg [2021-05-02 19:06:00,425 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:06:00,426 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:06:00,426 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:06:00,428 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:06:00,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:05:59" (1/4) ... [2021-05-02 19:06:00,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64434709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:00, skipping insertion in model container [2021-05-02 19:06:00,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:00" (2/4) ... [2021-05-02 19:06:00,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64434709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:00, skipping insertion in model container [2021-05-02 19:06:00,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:00" (3/4) ... [2021-05-02 19:06:00,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64434709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:00, skipping insertion in model container [2021-05-02 19:06:00,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:00" (4/4) ... [2021-05-02 19:06:00,430 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.cJordan [2021-05-02 19:06:00,434 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:06:00,436 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:06:00,463 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:06:00,493 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:06:00,493 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:06:00,493 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:06:00,494 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:06:00,494 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:06:00,494 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:06:00,494 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:06:00,494 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:06:00,502 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:06:00,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:00,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:00,506 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:00,507 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:00,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:00,510 INFO L82 PathProgramCache]: Analyzing trace with hash -633459621, now seen corresponding path program 1 times [2021-05-02 19:06:00,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:00,516 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632563035] [2021-05-02 19:06:00,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:00,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:00,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:00,659 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:00,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632563035] [2021-05-02 19:06:00,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632563035] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:00,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:00,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:06:00,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776323657] [2021-05-02 19:06:00,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:06:00,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:00,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:06:00,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:00,673 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:00,692 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2021-05-02 19:06:00,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:06:00,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:00,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:00,698 INFO L225 Difference]: With dead ends: 16 [2021-05-02 19:06:00,698 INFO L226 Difference]: Without dead ends: 11 [2021-05-02 19:06:00,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:00,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-05-02 19:06:00,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-05-02 19:06:00,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2021-05-02 19:06:00,717 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2021-05-02 19:06:00,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:00,717 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2021-05-02 19:06:00,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,718 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2021-05-02 19:06:00,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:00,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:00,718 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:00,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:06:00,718 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:00,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:00,719 INFO L82 PathProgramCache]: Analyzing trace with hash -633458660, now seen corresponding path program 1 times [2021-05-02 19:06:00,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:00,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386777621] [2021-05-02 19:06:00,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:00,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:00,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:00,791 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:00,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386777621] [2021-05-02 19:06:00,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386777621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:00,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:00,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:00,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198934029] [2021-05-02 19:06:00,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:00,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:00,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:00,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:00,794 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:00,837 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2021-05-02 19:06:00,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:00,837 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:00,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:00,838 INFO L225 Difference]: With dead ends: 13 [2021-05-02 19:06:00,838 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 19:06:00,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:00,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 19:06:00,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-05-02 19:06:00,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-05-02 19:06:00,842 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2021-05-02 19:06:00,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:00,843 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-05-02 19:06:00,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:00,843 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-05-02 19:06:00,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 19:06:00,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:00,843 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:00,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 19:06:00,844 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:00,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:00,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1132563481, now seen corresponding path program 1 times [2021-05-02 19:06:00,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:00,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529541990] [2021-05-02 19:06:00,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:00,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:00,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:00,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:00,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529541990] [2021-05-02 19:06:00,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529541990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:00,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348919703] [2021-05-02 19:06:00,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:00,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:00,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:00,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:01,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:01,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348919703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:01,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:06:01,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764853630] [2021-05-02 19:06:01,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:06:01,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:01,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:06:01,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:06:01,069 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:01,128 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2021-05-02 19:06:01,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:06:01,129 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 19:06:01,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:01,129 INFO L225 Difference]: With dead ends: 15 [2021-05-02 19:06:01,130 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 19:06:01,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 66.9ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:01,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 19:06:01,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-05-02 19:06:01,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-02 19:06:01,133 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2021-05-02 19:06:01,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:01,133 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-02 19:06:01,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,134 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-02 19:06:01,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 19:06:01,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:01,135 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:01,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 19:06:01,353 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:01,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:01,354 INFO L82 PathProgramCache]: Analyzing trace with hash 1767759062, now seen corresponding path program 2 times [2021-05-02 19:06:01,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:01,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338595942] [2021-05-02 19:06:01,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:01,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:01,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:01,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:01,433 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:01,433 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:01,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338595942] [2021-05-02 19:06:01,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338595942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172883667] [2021-05-02 19:06:01,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:01,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:01,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:01,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:01,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:01,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:01,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172883667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:01,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:06:01,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388108591] [2021-05-02 19:06:01,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:06:01,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:01,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:06:01,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:06:01,537 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:01,640 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2021-05-02 19:06:01,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:06:01,640 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 19:06:01,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:01,640 INFO L225 Difference]: With dead ends: 17 [2021-05-02 19:06:01,640 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 19:06:01,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 99.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:01,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 19:06:01,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 19:06:01,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 19:06:01,642 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2021-05-02 19:06:01,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:01,643 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 19:06:01,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:01,643 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 19:06:01,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 19:06:01,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:01,643 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:01,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:01,844 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:01,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:01,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1989610925, now seen corresponding path program 3 times [2021-05-02 19:06:01,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:01,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850637580] [2021-05-02 19:06:01,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:01,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:01,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:01,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:01,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850637580] [2021-05-02 19:06:01,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850637580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435424693] [2021-05-02 19:06:01,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:01,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 19:06:01,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:01,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:01,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:01,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:01,962 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:01,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435424693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:01,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:01,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:01,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598461248] [2021-05-02 19:06:01,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:01,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:01,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:01,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:01,963 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:02,054 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2021-05-02 19:06:02,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:02,054 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 19:06:02,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:02,055 INFO L225 Difference]: With dead ends: 19 [2021-05-02 19:06:02,055 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 19:06:02,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 95.9ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:02,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 19:06:02,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 19:06:02,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 19:06:02,057 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2021-05-02 19:06:02,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:02,057 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 19:06:02,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,057 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 19:06:02,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 19:06:02,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:02,057 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:02,273 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:02,274 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:02,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:02,274 INFO L82 PathProgramCache]: Analyzing trace with hash -754672496, now seen corresponding path program 4 times [2021-05-02 19:06:02,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:02,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132911619] [2021-05-02 19:06:02,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:02,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:02,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:02,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:02,329 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:02,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:02,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132911619] [2021-05-02 19:06:02,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132911619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:02,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808420371] [2021-05-02 19:06:02,329 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:02,363 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:02,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:02,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:02,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:02,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,402 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:02,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808420371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:02,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:02,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:02,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82461081] [2021-05-02 19:06:02,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:02,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:02,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:02,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:02,404 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:02,524 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2021-05-02 19:06:02,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:02,524 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 19:06:02,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:02,525 INFO L225 Difference]: With dead ends: 21 [2021-05-02 19:06:02,525 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 19:06:02,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 126.2ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:02,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 19:06:02,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 19:06:02,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 19:06:02,527 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2021-05-02 19:06:02,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:02,527 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 19:06:02,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:02,527 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 19:06:02,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 19:06:02,528 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:02,528 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:02,734 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:02,734 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:02,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:02,734 INFO L82 PathProgramCache]: Analyzing trace with hash 610184077, now seen corresponding path program 5 times [2021-05-02 19:06:02,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:02,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912333701] [2021-05-02 19:06:02,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:02,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:02,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:02,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:02,803 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:02,804 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:02,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912333701] [2021-05-02 19:06:02,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912333701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:02,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397201715] [2021-05-02 19:06:02,804 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:02,856 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 19:06:02,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:02,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:02,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:02,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:02,906 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:02,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397201715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:02,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:02,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:06:02,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668407239] [2021-05-02 19:06:02,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:06:02,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:02,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:06:02,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:02,908 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:03,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:03,050 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 19:06:03,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:06:03,050 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 19:06:03,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:03,051 INFO L225 Difference]: With dead ends: 22 [2021-05-02 19:06:03,051 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 19:06:03,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 144.2ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:06:03,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 19:06:03,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 19:06:03,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:03,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 19:06:03,053 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2021-05-02 19:06:03,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:03,053 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 19:06:03,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:03,053 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 19:06:03,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 19:06:03,053 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:03,053 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:03,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 19:06:03,270 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:03,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:03,270 INFO L82 PathProgramCache]: Analyzing trace with hash -2022641846, now seen corresponding path program 6 times [2021-05-02 19:06:03,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:03,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837296469] [2021-05-02 19:06:03,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:03,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 19:06:03,277 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 19:06:03,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 19:06:03,314 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 19:06:03,324 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 19:06:03,324 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 19:06:03,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 19:06:03,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:03 BasicIcfg [2021-05-02 19:06:03,366 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 19:06:03,367 INFO L168 Benchmark]: Toolchain (without parser) took 3461.42 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 143.7 MB in the beginning and 106.9 MB in the end (delta: 36.8 MB). Peak memory consumption was 73.5 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,369 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 177.2 MB. Free memory was 160.1 MB in the beginning and 160.0 MB in the end (delta: 105.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 19:06:03,371 INFO L168 Benchmark]: CACSL2BoogieTranslator took 137.01 ms. Allocated memory is still 177.2 MB. Free memory was 143.5 MB in the beginning and 134.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,371 INFO L168 Benchmark]: Boogie Preprocessor took 34.28 ms. Allocated memory is still 177.2 MB. Free memory was 134.5 MB in the beginning and 133.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,371 INFO L168 Benchmark]: RCFGBuilder took 316.95 ms. Allocated memory is still 177.2 MB. Free memory was 133.0 MB in the beginning and 149.9 MB in the end (delta: -16.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,371 INFO L168 Benchmark]: IcfgTransformer took 26.45 ms. Allocated memory is still 177.2 MB. Free memory was 149.9 MB in the beginning and 148.8 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,371 INFO L168 Benchmark]: TraceAbstraction took 2940.12 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 148.1 MB in the beginning and 106.9 MB in the end (delta: 41.1 MB). Peak memory consumption was 77.5 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:03,375 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 177.2 MB. Free memory was 160.1 MB in the beginning and 160.0 MB in the end (delta: 105.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 137.01 ms. Allocated memory is still 177.2 MB. Free memory was 143.5 MB in the beginning and 134.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.28 ms. Allocated memory is still 177.2 MB. Free memory was 134.5 MB in the beginning and 133.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 316.95 ms. Allocated memory is still 177.2 MB. Free memory was 133.0 MB in the beginning and 149.9 MB in the end (delta: -16.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. * IcfgTransformer took 26.45 ms. Allocated memory is still 177.2 MB. Free memory was 149.9 MB in the beginning and 148.8 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2940.12 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 148.1 MB in the beginning and 106.9 MB in the end (delta: 41.1 MB). Peak memory consumption was 77.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 23]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int a = 6; [L19] a = 0 VAL [a=0] [L19] COND TRUE a < 6 VAL [a=0] [L19] ++a VAL [a=1] [L19] COND TRUE a < 6 VAL [a=1] [L19] ++a VAL [a=2] [L19] COND TRUE a < 6 VAL [a=2] [L19] ++a VAL [a=3] [L19] COND TRUE a < 6 VAL [a=3] [L19] ++a VAL [a=4] [L19] COND TRUE a < 6 VAL [a=4] [L19] ++a VAL [a=5] [L19] COND TRUE a < 6 VAL [a=5] [L19] ++a VAL [a=6] [L19] COND FALSE !(a < 6) VAL [a=6] [L22] COND TRUE a == 6 VAL [a=6] [L23] reach_error() VAL [a=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2833.3ms, OverallIterations: 8, TraceHistogramMax: 6, EmptinessCheckTime: 9.3ms, AutomataDifference: 605.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 63 SDtfs, 86 SDslu, 99 SDs, 0 SdLazy, 154 SolverSat, 34 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 120.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 141 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 597.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=7, InterpolantAutomatonStates: 42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 22.7ms AutomataMinimizationTime, 7 MinimizatonAttempts, 5 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 52.9ms SsaConstructionTime, 150.8ms SatisfiabilityAnalysisTime, 645.8ms InterpolantComputationTime, 189 NumberOfCodeBlocks, 188 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 156 ConstructedInterpolants, 0 QuantifiedInterpolants, 508 SizeOfPredicates, 0 NumberOfNonLiveVariables, 411 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 0/110 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 incorrect! Received shutdown request...