/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-18 11:39:08,174 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 11:39:08,175 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 11:39:08,203 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 11:39:08,243 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 11:39:08,244 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 11:39:08,245 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 11:39:08,245 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-03-18 11:39:08,273 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 11:39:08,273 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 11:39:08,273 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-18 11:39:08,273 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-18 11:39:08,275 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-18 11:39:08,275 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-18 11:39:08,275 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-18 11:39:08,275 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-18 11:39:08,275 INFO L138 SettingsManager]: * Use SBE=true [2022-03-18 11:39:08,276 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 11:39:08,276 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-18 11:39:08,276 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 11:39:08,276 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-18 11:39:08,276 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 11:39:08,277 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 11:39:08,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 11:39:08,278 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 11:39:08,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 11:39:08,463 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 11:39:08,479 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 11:39:08,481 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 11:39:08,482 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 11:39:08,486 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 11:39:08,487 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2022-03-18 11:39:08,541 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a5de5be/45f8ea5652914ed6aba0cbf5a72fe5e0/FLAG77c93ad1a [2022-03-18 11:39:08,843 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 11:39:08,844 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2022-03-18 11:39:08,856 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a5de5be/45f8ea5652914ed6aba0cbf5a72fe5e0/FLAG77c93ad1a [2022-03-18 11:39:09,275 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a5de5be/45f8ea5652914ed6aba0cbf5a72fe5e0 [2022-03-18 11:39:09,277 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 11:39:09,278 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 11:39:09,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 11:39:09,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 11:39:09,295 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 11:39:09,295 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,296 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10da9a4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09, skipping insertion in model container [2022-03-18 11:39:09,296 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,300 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 11:39:09,308 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 11:39:09,454 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2022-03-18 11:39:09,467 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 11:39:09,471 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 11:39:09,479 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2022-03-18 11:39:09,484 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 11:39:09,492 INFO L208 MainTranslator]: Completed translation [2022-03-18 11:39:09,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09 WrapperNode [2022-03-18 11:39:09,493 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 11:39:09,493 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 11:39:09,494 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 11:39:09,494 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 11:39:09,501 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,501 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,506 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,506 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,514 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,514 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,523 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 11:39:09,524 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 11:39:09,524 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 11:39:09,524 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 11:39:09,525 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (1/1) ... [2022-03-18 11:39:09,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 11:39:09,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:09,547 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 11:39:09,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 11:39:09,595 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 11:39:09,596 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 11:39:09,596 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 11:39:09,596 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 11:39:09,596 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 11:39:09,597 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 11:39:09,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 11:39:09,598 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 11:39:09,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 11:39:09,641 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 11:39:09,643 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 11:39:09,736 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 11:39:09,741 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 11:39:09,741 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-18 11:39:09,742 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 11:39:09 BoogieIcfgContainer [2022-03-18 11:39:09,742 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 11:39:09,744 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 11:39:09,744 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 11:39:09,758 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 11:39:09,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 11:39:09" (1/3) ... [2022-03-18 11:39:09,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c7cd1fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 11:39:09, skipping insertion in model container [2022-03-18 11:39:09,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 11:39:09" (2/3) ... [2022-03-18 11:39:09,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c7cd1fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 11:39:09, skipping insertion in model container [2022-03-18 11:39:09,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 11:39:09" (3/3) ... [2022-03-18 11:39:09,760 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2022-03-18 11:39:09,764 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-18 11:39:09,764 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 11:39:09,795 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 11:39:09,799 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 11:39:09,799 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 11:39:09,809 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 11:39:09,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 11:39:09,812 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:09,812 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:09,813 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:09,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:09,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1739069180, now seen corresponding path program 1 times [2022-03-18 11:39:09,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:09,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319088534] [2022-03-18 11:39:09,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:09,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:09,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:09,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:09,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:09,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:09,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:09,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319088534] [2022-03-18 11:39:09,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319088534] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 11:39:09,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 11:39:09,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 11:39:09,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324483971] [2022-03-18 11:39:09,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 11:39:09,959 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 11:39:09,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:10,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 11:39:10,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 11:39:10,005 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:10,047 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2022-03-18 11:39:10,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 11:39:10,049 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 [2022-03-18 11:39:10,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:10,054 INFO L225 Difference]: With dead ends: 51 [2022-03-18 11:39:10,054 INFO L226 Difference]: Without dead ends: 24 [2022-03-18 11:39:10,057 INFO L911 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 [2022-03-18 11:39:10,062 INFO L912 BasicCegarLoop]: 30 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:10,063 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 11:39:10,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-18 11:39:10,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-18 11:39:10,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 11:39:10,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-03-18 11:39:10,097 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-03-18 11:39:10,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:10,097 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-03-18 11:39:10,098 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,098 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-03-18 11:39:10,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 11:39:10,098 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:10,099 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:10,099 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 11:39:10,099 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:10,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:10,103 INFO L85 PathProgramCache]: Analyzing trace with hash 186732794, now seen corresponding path program 1 times [2022-03-18 11:39:10,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:10,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114540359] [2022-03-18 11:39:10,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:10,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:10,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:10,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,242 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:10,242 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:10,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114540359] [2022-03-18 11:39:10,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114540359] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 11:39:10,243 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 11:39:10,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 11:39:10,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506998204] [2022-03-18 11:39:10,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 11:39:10,244 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 11:39:10,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:10,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 11:39:10,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-18 11:39:10,245 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:10,332 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2022-03-18 11:39:10,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 11:39:10,333 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 [2022-03-18 11:39:10,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:10,335 INFO L225 Difference]: With dead ends: 44 [2022-03-18 11:39:10,335 INFO L226 Difference]: Without dead ends: 30 [2022-03-18 11:39:10,335 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-18 11:39:10,336 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:10,336 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 24 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 11:39:10,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-18 11:39:10,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2022-03-18 11:39:10,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 11:39:10,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-18 11:39:10,343 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-03-18 11:39:10,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:10,343 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-18 11:39:10,343 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,344 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-18 11:39:10,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-18 11:39:10,344 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:10,344 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:10,344 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 11:39:10,344 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:10,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:10,345 INFO L85 PathProgramCache]: Analyzing trace with hash -848440424, now seen corresponding path program 1 times [2022-03-18 11:39:10,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:10,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94190303] [2022-03-18 11:39:10,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:10,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:10,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 11:39:10,447 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:10,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94190303] [2022-03-18 11:39:10,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94190303] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 11:39:10,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 11:39:10,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 11:39:10,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108778426] [2022-03-18 11:39:10,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 11:39:10,450 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 11:39:10,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:10,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 11:39:10,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 11:39:10,452 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:10,532 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-03-18 11:39:10,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 11:39:10,532 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 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 [2022-03-18 11:39:10,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:10,534 INFO L225 Difference]: With dead ends: 37 [2022-03-18 11:39:10,534 INFO L226 Difference]: Without dead ends: 26 [2022-03-18 11:39:10,535 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-18 11:39:10,542 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:10,543 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 27 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 11:39:10,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-18 11:39:10,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-18 11:39:10,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 11:39:10,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-03-18 11:39:10,549 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2022-03-18 11:39:10,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:10,549 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-03-18 11:39:10,549 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:10,549 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-03-18 11:39:10,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 11:39:10,550 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:10,550 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:10,550 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-18 11:39:10,550 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:10,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:10,551 INFO L85 PathProgramCache]: Analyzing trace with hash 689124982, now seen corresponding path program 1 times [2022-03-18 11:39:10,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:10,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262421243] [2022-03-18 11:39:10,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:10,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:10,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:10,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:10,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:10,911 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:10,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262421243] [2022-03-18 11:39:10,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262421243] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:10,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855977826] [2022-03-18 11:39:10,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:10,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:10,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:10,913 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:10,957 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 11:39:11,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:11,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 11:39:11,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:11,121 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-18 11:39:11,210 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2022-03-18 11:39:11,280 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-03-18 11:39:11,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:11,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:11,356 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-18 11:39:11,357 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-18 11:39:11,364 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-18 11:39:11,373 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-18 11:39:11,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-18 11:39:11,550 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:11,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855977826] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:11,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:11,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2022-03-18 11:39:11,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933535303] [2022-03-18 11:39:11,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:11,551 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 11:39:11,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:11,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 11:39:11,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-03-18 11:39:11,552 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:12,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:12,057 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2022-03-18 11:39:12,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-18 11:39:12,058 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-18 11:39:12,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:12,059 INFO L225 Difference]: With dead ends: 54 [2022-03-18 11:39:12,059 INFO L226 Difference]: Without dead ends: 52 [2022-03-18 11:39:12,059 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=287, Invalid=1119, Unknown=0, NotChecked=0, Total=1406 [2022-03-18 11:39:12,060 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 74 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:12,060 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 71 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 11:39:12,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-18 11:39:12,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2022-03-18 11:39:12,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 11:39:12,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2022-03-18 11:39:12,066 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2022-03-18 11:39:12,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:12,066 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2022-03-18 11:39:12,067 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:12,067 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2022-03-18 11:39:12,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 11:39:12,067 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:12,067 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:12,102 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 11:39:12,302 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:12,302 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:12,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:12,303 INFO L85 PathProgramCache]: Analyzing trace with hash 369179156, now seen corresponding path program 2 times [2022-03-18 11:39:12,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:12,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552897525] [2022-03-18 11:39:12,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:12,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:12,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:12,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:12,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:12,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:12,387 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:12,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552897525] [2022-03-18 11:39:12,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552897525] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:12,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003275791] [2022-03-18 11:39:12,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 11:39:12,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:12,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:12,389 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:12,390 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 11:39:12,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 11:39:12,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 11:39:12,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 11:39:12,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:12,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:12,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:12,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003275791] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:12,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:12,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 7 [2022-03-18 11:39:12,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366604848] [2022-03-18 11:39:12,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:12,510 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 11:39:12,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:12,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 11:39:12,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-18 11:39:12,511 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:12,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:12,622 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2022-03-18 11:39:12,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 11:39:12,622 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-18 11:39:12,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:12,623 INFO L225 Difference]: With dead ends: 59 [2022-03-18 11:39:12,623 INFO L226 Difference]: Without dead ends: 48 [2022-03-18 11:39:12,623 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-03-18 11:39:12,624 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:12,624 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 46 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 11:39:12,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-18 11:39:12,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-18 11:39:12,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 11:39:12,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-03-18 11:39:12,630 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2022-03-18 11:39:12,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:12,630 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-03-18 11:39:12,631 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:12,631 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-03-18 11:39:12,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 11:39:12,631 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:12,631 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:12,672 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-18 11:39:12,872 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:12,872 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:12,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:12,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1704530446, now seen corresponding path program 3 times [2022-03-18 11:39:12,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:12,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789470248] [2022-03-18 11:39:12,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:12,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:12,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:13,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:13,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:13,125 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:13,125 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:13,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789470248] [2022-03-18 11:39:13,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789470248] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:13,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320248313] [2022-03-18 11:39:13,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-18 11:39:13,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:13,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:13,140 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:13,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 11:39:13,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-03-18 11:39:13,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 11:39:13,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 11:39:13,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:13,198 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-18 11:39:13,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-03-18 11:39:13,387 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-18 11:39:13,479 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-18 11:39:13,479 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-18 11:39:13,507 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:13,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:14,673 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 108 [2022-03-18 11:39:14,680 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-18 11:39:14,680 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 201 treesize of output 179 [2022-03-18 11:39:14,901 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:14,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320248313] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:14,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:14,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 35 [2022-03-18 11:39:14,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512807328] [2022-03-18 11:39:14,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:14,902 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-18 11:39:14,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:14,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-18 11:39:14,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1047, Unknown=2, NotChecked=0, Total=1190 [2022-03-18 11:39:14,902 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:15,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:15,774 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2022-03-18 11:39:15,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-18 11:39:15,775 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-18 11:39:15,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:15,776 INFO L225 Difference]: With dead ends: 80 [2022-03-18 11:39:15,776 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 11:39:15,778 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=560, Invalid=3098, Unknown=2, NotChecked=0, Total=3660 [2022-03-18 11:39:15,778 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 88 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:15,778 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 94 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 691 Invalid, 0 Unknown, 53 Unchecked, 0.3s Time] [2022-03-18 11:39:15,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 11:39:15,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 46. [2022-03-18 11:39:15,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 11:39:15,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-18 11:39:15,788 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2022-03-18 11:39:15,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:15,788 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-18 11:39:15,788 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:15,788 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-18 11:39:15,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 11:39:15,789 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:15,789 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:15,821 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 11:39:15,989 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:15,989 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:15,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:15,990 INFO L85 PathProgramCache]: Analyzing trace with hash -1823608176, now seen corresponding path program 4 times [2022-03-18 11:39:15,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:15,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366508436] [2022-03-18 11:39:15,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:15,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:16,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:16,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:16,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:16,037 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:16,037 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:16,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366508436] [2022-03-18 11:39:16,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366508436] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:16,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011143891] [2022-03-18 11:39:16,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 11:39:16,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:16,038 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:16,052 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:16,053 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 11:39:16,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 11:39:16,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 11:39:16,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-18 11:39:16,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:16,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-18 11:39:16,191 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-18 11:39:16,310 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-18 11:39:16,310 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-18 11:39:16,343 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-18 11:39:16,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:16,438 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-18 11:39:16,438 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-18 11:39:16,447 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-18 11:39:16,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-18 11:39:16,452 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-18 11:39:16,529 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-18 11:39:16,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011143891] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:16,530 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:16,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-03-18 11:39:16,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580395192] [2022-03-18 11:39:16,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:16,537 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-18 11:39:16,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:16,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-18 11:39:16,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-03-18 11:39:16,538 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:17,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:17,938 INFO L93 Difference]: Finished difference Result 125 states and 144 transitions. [2022-03-18 11:39:17,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-18 11:39:17,938 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-18 11:39:17,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:17,939 INFO L225 Difference]: With dead ends: 125 [2022-03-18 11:39:17,939 INFO L226 Difference]: Without dead ends: 111 [2022-03-18 11:39:17,940 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1390 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2022-03-18 11:39:17,940 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 104 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 930 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:17,941 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 76 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 930 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 11:39:17,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-18 11:39:17,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 71. [2022-03-18 11:39:17,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 62 states have internal predecessors, (69), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-18 11:39:17,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-03-18 11:39:17,950 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 27 [2022-03-18 11:39:17,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:17,950 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-03-18 11:39:17,951 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:17,951 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-03-18 11:39:17,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 11:39:17,952 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:17,952 INFO L500 BasicCegarLoop]: trace histogram [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] [2022-03-18 11:39:17,969 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 11:39:18,168 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:18,169 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:18,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:18,169 INFO L85 PathProgramCache]: Analyzing trace with hash 463472720, now seen corresponding path program 1 times [2022-03-18 11:39:18,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:18,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210536664] [2022-03-18 11:39:18,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:18,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:18,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-18 11:39:18,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 11:39:18,214 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:18,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210536664] [2022-03-18 11:39:18,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210536664] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:18,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508004934] [2022-03-18 11:39:18,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:18,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:18,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:18,228 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:18,238 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 11:39:18,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 11:39:18,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:18,329 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 11:39:18,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:18,375 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 11:39:18,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508004934] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:18,376 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:18,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 12 [2022-03-18 11:39:18,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87524085] [2022-03-18 11:39:18,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:18,377 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 11:39:18,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:18,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 11:39:18,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-18 11:39:18,377 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 11:39:18,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:18,553 INFO L93 Difference]: Finished difference Result 111 states and 129 transitions. [2022-03-18 11:39:18,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-18 11:39:18,553 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-03-18 11:39:18,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:18,554 INFO L225 Difference]: With dead ends: 111 [2022-03-18 11:39:18,554 INFO L226 Difference]: Without dead ends: 75 [2022-03-18 11:39:18,554 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2022-03-18 11:39:18,555 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 49 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:18,555 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 47 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 11:39:18,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-18 11:39:18,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2022-03-18 11:39:18,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 58 states have internal predecessors, (63), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-18 11:39:18,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2022-03-18 11:39:18,574 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 29 [2022-03-18 11:39:18,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:18,574 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2022-03-18 11:39:18,574 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 11:39:18,574 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2022-03-18 11:39:18,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-18 11:39:18,575 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:18,575 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 11:39:18,592 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-18 11:39:18,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:18,781 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:18,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:18,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1154270004, now seen corresponding path program 5 times [2022-03-18 11:39:18,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:18,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194325491] [2022-03-18 11:39:18,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:18,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:18,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 11:39:18,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 11:39:18,835 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:18,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 11:39:18,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194325491] [2022-03-18 11:39:18,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194325491] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 11:39:18,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613345002] [2022-03-18 11:39:18,836 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-18 11:39:18,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:18,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 11:39:18,839 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 11:39:18,840 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 11:39:18,889 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-03-18 11:39:18,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 11:39:18,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 11:39:18,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 11:39:18,933 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:18,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 11:39:18,983 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 11:39:18,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613345002] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 11:39:18,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 11:39:18,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 10 [2022-03-18 11:39:18,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345336828] [2022-03-18 11:39:18,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 11:39:18,984 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 11:39:18,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 11:39:18,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 11:39:18,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2022-03-18 11:39:18,984 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:19,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 11:39:19,176 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2022-03-18 11:39:19,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 11:39:19,176 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-18 11:39:19,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 11:39:19,177 INFO L225 Difference]: With dead ends: 128 [2022-03-18 11:39:19,177 INFO L226 Difference]: Without dead ends: 106 [2022-03-18 11:39:19,177 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2022-03-18 11:39:19,177 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 78 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 11:39:19,178 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 32 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 11:39:19,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-18 11:39:19,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 75. [2022-03-18 11:39:19,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 66 states have internal predecessors, (70), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-18 11:39:19,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2022-03-18 11:39:19,188 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 31 [2022-03-18 11:39:19,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 11:39:19,189 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2022-03-18 11:39:19,189 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 11:39:19,189 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2022-03-18 11:39:19,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-18 11:39:19,192 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 11:39:19,192 INFO L500 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] [2022-03-18 11:39:19,209 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-18 11:39:19,407 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 11:39:19,407 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 11:39:19,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 11:39:19,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1181909964, now seen corresponding path program 2 times [2022-03-18 11:39:19,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 11:39:19,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75977000] [2022-03-18 11:39:19,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 11:39:19,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 11:39:19,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 11:39:19,450 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 11:39:19,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 11:39:19,496 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 11:39:19,498 INFO L614 BasicCegarLoop]: Counterexample is feasible [2022-03-18 11:39:19,498 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-18 11:39:19,499 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-18 11:39:19,501 INFO L718 BasicCegarLoop]: Path program histogram: [5, 2, 1, 1, 1] [2022-03-18 11:39:19,504 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-18 11:39:19,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.03 11:39:19 BoogieIcfgContainer [2022-03-18 11:39:19,538 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-18 11:39:19,539 INFO L158 Benchmark]: Toolchain (without parser) took 10260.90ms. Allocated memory was 199.2MB in the beginning and 239.1MB in the end (delta: 39.8MB). Free memory was 173.8MB in the beginning and 190.5MB in the end (delta: -16.7MB). Peak memory consumption was 23.2MB. Max. memory is 8.0GB. [2022-03-18 11:39:19,539 INFO L158 Benchmark]: CDTParser took 0.12ms. Allocated memory is still 199.2MB. Free memory is still 159.5MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-18 11:39:19,539 INFO L158 Benchmark]: CACSL2BoogieTranslator took 214.43ms. Allocated memory is still 199.2MB. Free memory was 173.5MB in the beginning and 171.9MB in the end (delta: 1.6MB). Peak memory consumption was 7.3MB. Max. memory is 8.0GB. [2022-03-18 11:39:19,539 INFO L158 Benchmark]: Boogie Preprocessor took 29.98ms. Allocated memory is still 199.2MB. Free memory was 171.9MB in the beginning and 170.6MB in the end (delta: 1.4MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-03-18 11:39:19,539 INFO L158 Benchmark]: RCFGBuilder took 218.39ms. Allocated memory is still 199.2MB. Free memory was 170.6MB in the beginning and 159.4MB in the end (delta: 11.2MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-18 11:39:19,540 INFO L158 Benchmark]: TraceAbstraction took 9794.80ms. Allocated memory was 199.2MB in the beginning and 239.1MB in the end (delta: 39.8MB). Free memory was 158.7MB in the beginning and 190.5MB in the end (delta: -31.8MB). Peak memory consumption was 9.6MB. Max. memory is 8.0GB. [2022-03-18 11:39:19,543 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12ms. Allocated memory is still 199.2MB. Free memory is still 159.5MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 214.43ms. Allocated memory is still 199.2MB. Free memory was 173.5MB in the beginning and 171.9MB in the end (delta: 1.6MB). Peak memory consumption was 7.3MB. Max. memory is 8.0GB. * Boogie Preprocessor took 29.98ms. Allocated memory is still 199.2MB. Free memory was 171.9MB in the beginning and 170.6MB in the end (delta: 1.4MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 218.39ms. Allocated memory is still 199.2MB. Free memory was 170.6MB in the beginning and 159.4MB in the end (delta: 11.2MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * TraceAbstraction took 9794.80ms. Allocated memory was 199.2MB in the beginning and 239.1MB in the end (delta: 39.8MB). Free memory was 158.7MB in the beginning and 190.5MB in the end (delta: -31.8MB). Peak memory consumption was 9.6MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={5:0}, str2={4:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L35] COND TRUE i