/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/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-zilu/benchmark20_conjunctive.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 19:15:16,731 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 19:15:16,732 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 19:15:16,764 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 19:15:16,801 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 19:15:16,801 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 19:15:16,802 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 19:15:16,803 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 19:15:16,811 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 19:15:16,811 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 19:15:16,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 19:15:16,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 19:15:16,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:15:16,813 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 19:15:16,813 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 19:15:16,814 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 19:15:16,814 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 19:15:16,814 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 19:15:16,814 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 19:15:16,814 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 19:15:16,993 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 19:15:17,012 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 19:15:17,014 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 19:15:17,015 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 19:15:17,015 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 19:15:17,016 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-zilu/benchmark20_conjunctive.i [2022-03-20 19:15:17,072 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9337a2335/69f72538d6f94e949bdceaf8de5a5441/FLAG153538a2b [2022-03-20 19:15:17,418 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 19:15:17,419 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark20_conjunctive.i [2022-03-20 19:15:17,423 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9337a2335/69f72538d6f94e949bdceaf8de5a5441/FLAG153538a2b [2022-03-20 19:15:17,433 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9337a2335/69f72538d6f94e949bdceaf8de5a5441 [2022-03-20 19:15:17,435 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 19:15:17,436 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 19:15:17,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 19:15:17,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 19:15:17,443 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 19:15:17,444 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43a4d000 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17, skipping insertion in model container [2022-03-20 19:15:17,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 19:15:17,464 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 19:15:17,574 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark20_conjunctive.i[873,886] [2022-03-20 19:15:17,602 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:15:17,609 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 19:15:17,619 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark20_conjunctive.i[873,886] [2022-03-20 19:15:17,624 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:15:17,633 INFO L208 MainTranslator]: Completed translation [2022-03-20 19:15:17,633 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17 WrapperNode [2022-03-20 19:15:17,633 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 19:15:17,634 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 19:15:17,634 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 19:15:17,635 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 19:15:17,643 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,643 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,649 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,650 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,661 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,669 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 19:15:17,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 19:15:17,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 19:15:17,670 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 19:15:17,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (1/1) ... [2022-03-20 19:15:17,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:15:17,688 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:17,699 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) [2022-03-20 19:15:17,734 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 [2022-03-20 19:15:17,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 19:15:17,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 19:15:17,751 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 19:15:17,751 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 19:15:17,751 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 19:15:17,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 19:15:17,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-03-20 19:15:17,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 19:15:17,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 19:15:17,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 19:15:17,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 19:15:17,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 19:15:17,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 19:15:17,754 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 19:15:17,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 19:15:17,820 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 19:15:17,821 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 19:15:17,895 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 19:15:17,899 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 19:15:17,899 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 19:15:17,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:15:17 BoogieIcfgContainer [2022-03-20 19:15:17,900 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 19:15:17,916 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 19:15:17,916 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 19:15:17,920 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 19:15:17,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 07:15:17" (1/3) ... [2022-03-20 19:15:17,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f23a7e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:15:17, skipping insertion in model container [2022-03-20 19:15:17,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:15:17" (2/3) ... [2022-03-20 19:15:17,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f23a7e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:15:17, skipping insertion in model container [2022-03-20 19:15:17,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:15:17" (3/3) ... [2022-03-20 19:15:17,921 INFO L111 eAbstractionObserver]: Analyzing ICFG benchmark20_conjunctive.i [2022-03-20 19:15:17,927 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 19:15:17,927 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 19:15:17,967 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 19:15:17,972 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2022-03-20 19:15:17,972 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 19:15:17,981 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-03-20 19:15:17,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 19:15:17,985 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:17,986 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:17,986 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:17,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:17,989 INFO L85 PathProgramCache]: Analyzing trace with hash -304977768, now seen corresponding path program 1 times [2022-03-20 19:15:17,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:17,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [941188238] [2022-03-20 19:15:18,001 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:15:18,002 INFO L85 PathProgramCache]: Analyzing trace with hash -304977768, now seen corresponding path program 2 times [2022-03-20 19:15:18,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:18,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432502478] [2022-03-20 19:15:18,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:18,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:18,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:18,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:18,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:18,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:18,144 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:18,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432502478] [2022-03-20 19:15:18,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432502478] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:18,145 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:18,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 19:15:18,147 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:18,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [941188238] [2022-03-20 19:15:18,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [941188238] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:18,147 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:18,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 19:15:18,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686195174] [2022-03-20 19:15:18,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:18,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 19:15:18,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:18,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 19:15:18,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 19:15:18,168 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-03-20 19:15:18,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:18,255 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2022-03-20 19:15:18,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 19:15:18,256 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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 12 [2022-03-20 19:15:18,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:18,260 INFO L225 Difference]: With dead ends: 41 [2022-03-20 19:15:18,260 INFO L226 Difference]: Without dead ends: 14 [2022-03-20 19:15:18,262 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 19:15:18,264 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 25 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:18,265 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 40 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:18,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-20 19:15:18,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-20 19:15:18,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 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) [2022-03-20 19:15:18,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-20 19:15:18,295 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-03-20 19:15:18,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:18,295 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-20 19:15:18,296 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-03-20 19:15:18,296 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-20 19:15:18,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 19:15:18,296 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:18,296 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:18,296 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 19:15:18,297 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:18,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:18,297 INFO L85 PathProgramCache]: Analyzing trace with hash -828987386, now seen corresponding path program 1 times [2022-03-20 19:15:18,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:18,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1248606211] [2022-03-20 19:15:18,452 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:18,453 INFO L85 PathProgramCache]: Analyzing trace with hash 28963623, now seen corresponding path program 1 times [2022-03-20 19:15:18,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:18,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767812131] [2022-03-20 19:15:18,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:18,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:18,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:18,466 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:18,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:18,486 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:18,486 INFO L85 PathProgramCache]: Analyzing trace with hash -828987386, now seen corresponding path program 2 times [2022-03-20 19:15:18,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:18,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448843113] [2022-03-20 19:15:18,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:18,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:18,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:18,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:18,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:18,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:18,535 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:18,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448843113] [2022-03-20 19:15:18,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448843113] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:18,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358583512] [2022-03-20 19:15:18,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:15:18,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:18,536 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:18,538 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) [2022-03-20 19:15:18,580 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 19:15:18,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:15:18,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:18,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 19:15:18,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:18,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:18,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:18,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:18,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358583512] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:18,763 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:18,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-20 19:15:18,764 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:18,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1248606211] [2022-03-20 19:15:18,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1248606211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:18,764 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:18,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 19:15:18,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364772867] [2022-03-20 19:15:18,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:18,765 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 19:15:18,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:18,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 19:15:18,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 19:15:18,766 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 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) [2022-03-20 19:15:18,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:18,831 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-03-20 19:15:18,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 19:15:18,831 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 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 13 [2022-03-20 19:15:18,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:18,832 INFO L225 Difference]: With dead ends: 20 [2022-03-20 19:15:18,832 INFO L226 Difference]: Without dead ends: 15 [2022-03-20 19:15:18,833 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-03-20 19:15:18,834 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:18,837 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 33 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:18,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-20 19:15:18,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-20 19:15:18,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 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) [2022-03-20 19:15:18,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-03-20 19:15:18,844 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-03-20 19:15:18,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:18,844 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-03-20 19:15:18,844 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 5 states have internal predecessors, (9), 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) [2022-03-20 19:15:18,845 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-03-20 19:15:18,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 19:15:18,845 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:18,845 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:18,865 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:19,059 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:19,060 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:19,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:19,060 INFO L85 PathProgramCache]: Analyzing trace with hash 106583640, now seen corresponding path program 3 times [2022-03-20 19:15:19,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:19,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [505044317] [2022-03-20 19:15:19,246 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:19,246 INFO L85 PathProgramCache]: Analyzing trace with hash 88068967, now seen corresponding path program 1 times [2022-03-20 19:15:19,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:19,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134374054] [2022-03-20 19:15:19,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:19,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:19,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:19,255 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:19,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:19,265 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:19,265 INFO L85 PathProgramCache]: Analyzing trace with hash 106583640, now seen corresponding path program 4 times [2022-03-20 19:15:19,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:19,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508805626] [2022-03-20 19:15:19,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:19,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:19,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:19,338 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:19,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:19,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:19,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508805626] [2022-03-20 19:15:19,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508805626] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:19,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003223194] [2022-03-20 19:15:19,352 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:15:19,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:19,352 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:19,353 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) [2022-03-20 19:15:19,354 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 19:15:19,383 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:15:19,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:19,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 19:15:19,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:19,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:19,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:19,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:19,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003223194] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:19,571 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:19,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2022-03-20 19:15:19,571 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:19,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [505044317] [2022-03-20 19:15:19,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [505044317] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:19,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:19,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 19:15:19,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609167229] [2022-03-20 19:15:19,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:19,572 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 19:15:19,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:19,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 19:15:19,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2022-03-20 19:15:19,573 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 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) [2022-03-20 19:15:19,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:19,640 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-03-20 19:15:19,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 19:15:19,641 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 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 14 [2022-03-20 19:15:19,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:19,641 INFO L225 Difference]: With dead ends: 21 [2022-03-20 19:15:19,641 INFO L226 Difference]: Without dead ends: 16 [2022-03-20 19:15:19,642 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:15:19,642 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:19,643 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 38 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:19,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-20 19:15:19,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-20 19:15:19,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 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) [2022-03-20 19:15:19,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-03-20 19:15:19,646 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-03-20 19:15:19,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:19,646 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-03-20 19:15:19,646 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 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) [2022-03-20 19:15:19,646 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-03-20 19:15:19,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 19:15:19,646 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:19,647 INFO L499 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:19,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:19,863 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,SelfDestructingSolverStorable3 [2022-03-20 19:15:19,863 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:19,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:19,864 INFO L85 PathProgramCache]: Analyzing trace with hash -955485626, now seen corresponding path program 5 times [2022-03-20 19:15:19,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:19,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1817629561] [2022-03-20 19:15:20,012 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:20,013 INFO L85 PathProgramCache]: Analyzing trace with hash 147174311, now seen corresponding path program 1 times [2022-03-20 19:15:20,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:20,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026867466] [2022-03-20 19:15:20,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:20,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:20,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:20,028 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:20,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:20,042 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:20,042 INFO L85 PathProgramCache]: Analyzing trace with hash -955485626, now seen corresponding path program 6 times [2022-03-20 19:15:20,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:20,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290108621] [2022-03-20 19:15:20,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:20,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:20,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:20,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:20,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:20,114 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:20,114 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:20,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290108621] [2022-03-20 19:15:20,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290108621] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:20,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076096592] [2022-03-20 19:15:20,114 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:15:20,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:20,115 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:20,116 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) [2022-03-20 19:15:20,117 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 19:15:20,144 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 19:15:20,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:20,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 19:15:20,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:20,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:20,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:20,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:20,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076096592] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:20,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:20,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 20 [2022-03-20 19:15:20,344 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:20,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1817629561] [2022-03-20 19:15:20,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1817629561] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:20,345 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:20,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 19:15:20,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632048903] [2022-03-20 19:15:20,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:20,345 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 19:15:20,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:20,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 19:15:20,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:15:20,346 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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) [2022-03-20 19:15:20,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:20,453 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-20 19:15:20,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 19:15:20,453 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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 15 [2022-03-20 19:15:20,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:20,453 INFO L225 Difference]: With dead ends: 22 [2022-03-20 19:15:20,454 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 19:15:20,454 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:15:20,455 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 11 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:20,455 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 47 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:20,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 19:15:20,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 19:15:20,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 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) [2022-03-20 19:15:20,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-03-20 19:15:20,458 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-03-20 19:15:20,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:20,458 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-03-20 19:15:20,458 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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) [2022-03-20 19:15:20,458 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-03-20 19:15:20,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 19:15:20,458 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:20,459 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:20,478 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-03-20 19:15:20,679 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:20,680 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:20,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:20,680 INFO L85 PathProgramCache]: Analyzing trace with hash 480105496, now seen corresponding path program 7 times [2022-03-20 19:15:20,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:20,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [497236751] [2022-03-20 19:15:20,785 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:20,785 INFO L85 PathProgramCache]: Analyzing trace with hash 206279655, now seen corresponding path program 1 times [2022-03-20 19:15:20,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:20,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712523989] [2022-03-20 19:15:20,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:20,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:20,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:20,791 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:20,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:20,797 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:20,797 INFO L85 PathProgramCache]: Analyzing trace with hash 480105496, now seen corresponding path program 8 times [2022-03-20 19:15:20,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:20,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153008809] [2022-03-20 19:15:20,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:20,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:20,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:20,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:20,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:20,869 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:20,869 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:20,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153008809] [2022-03-20 19:15:20,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153008809] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:20,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69080300] [2022-03-20 19:15:20,869 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:15:20,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:20,869 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:20,870 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) [2022-03-20 19:15:20,871 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 19:15:20,904 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:15:20,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:20,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 19:15:20,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:21,012 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:21,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:21,124 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:21,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69080300] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:21,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:21,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2022-03-20 19:15:21,124 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:21,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [497236751] [2022-03-20 19:15:21,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [497236751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:21,125 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:21,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 19:15:21,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630965625] [2022-03-20 19:15:21,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:21,125 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 19:15:21,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:21,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 19:15:21,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:15:21,126 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 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) [2022-03-20 19:15:21,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:21,237 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-03-20 19:15:21,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 19:15:21,237 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 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 16 [2022-03-20 19:15:21,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:21,237 INFO L225 Difference]: With dead ends: 23 [2022-03-20 19:15:21,237 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 19:15:21,238 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:15:21,239 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:21,239 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 48 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:21,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 19:15:21,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 19:15:21,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 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) [2022-03-20 19:15:21,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-03-20 19:15:21,242 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-03-20 19:15:21,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:21,242 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-03-20 19:15:21,242 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 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) [2022-03-20 19:15:21,242 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-03-20 19:15:21,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 19:15:21,242 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:21,242 INFO L499 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:21,261 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:21,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:21,451 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:21,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:21,452 INFO L85 PathProgramCache]: Analyzing trace with hash 2033757318, now seen corresponding path program 9 times [2022-03-20 19:15:21,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:21,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1910792910] [2022-03-20 19:15:21,598 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:21,599 INFO L85 PathProgramCache]: Analyzing trace with hash 265384999, now seen corresponding path program 1 times [2022-03-20 19:15:21,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:21,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526121319] [2022-03-20 19:15:21,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:21,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:21,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:21,604 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:21,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:21,609 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:21,609 INFO L85 PathProgramCache]: Analyzing trace with hash 2033757318, now seen corresponding path program 10 times [2022-03-20 19:15:21,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:21,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872639364] [2022-03-20 19:15:21,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:21,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:21,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:21,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:21,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:21,678 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:21,678 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:21,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872639364] [2022-03-20 19:15:21,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872639364] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:21,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469187353] [2022-03-20 19:15:21,679 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:15:21,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:21,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:21,680 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) [2022-03-20 19:15:21,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 19:15:21,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:15:21,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:21,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 19:15:21,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:21,825 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:21,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:21,952 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:21,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469187353] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:21,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:21,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 24 [2022-03-20 19:15:21,953 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:21,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1910792910] [2022-03-20 19:15:21,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1910792910] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:21,953 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:21,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:15:21,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534085516] [2022-03-20 19:15:21,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:21,953 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 19:15:21,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:21,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 19:15:21,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:15:21,954 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 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) [2022-03-20 19:15:22,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:22,080 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-20 19:15:22,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 19:15:22,081 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 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 [2022-03-20 19:15:22,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:22,081 INFO L225 Difference]: With dead ends: 24 [2022-03-20 19:15:22,081 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 19:15:22,082 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=844, Unknown=0, NotChecked=0, Total=992 [2022-03-20 19:15:22,082 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:22,083 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 53 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:22,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 19:15:22,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 19:15:22,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 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) [2022-03-20 19:15:22,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2022-03-20 19:15:22,086 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2022-03-20 19:15:22,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:22,086 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2022-03-20 19:15:22,086 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 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) [2022-03-20 19:15:22,086 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2022-03-20 19:15:22,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 19:15:22,086 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:22,086 INFO L499 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:22,107 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:22,295 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10,SelfDestructingSolverStorable9 [2022-03-20 19:15:22,295 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:22,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:22,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1342643752, now seen corresponding path program 11 times [2022-03-20 19:15:22,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:22,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [950001161] [2022-03-20 19:15:22,411 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:22,412 INFO L85 PathProgramCache]: Analyzing trace with hash 324490343, now seen corresponding path program 1 times [2022-03-20 19:15:22,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:22,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775833678] [2022-03-20 19:15:22,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:22,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:22,425 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:22,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:22,440 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:22,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1342643752, now seen corresponding path program 12 times [2022-03-20 19:15:22,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:22,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757207892] [2022-03-20 19:15:22,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:22,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:22,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:22,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:22,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:22,543 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:22,543 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:22,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757207892] [2022-03-20 19:15:22,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757207892] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:22,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435505738] [2022-03-20 19:15:22,544 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:15:22,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:22,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:22,545 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) [2022-03-20 19:15:22,598 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 19:15:22,602 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 19:15:22,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:22,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 19:15:22,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:22,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:22,894 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:22,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435505738] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:22,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:22,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 27 [2022-03-20 19:15:22,895 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:22,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [950001161] [2022-03-20 19:15:22,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [950001161] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:22,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:22,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 19:15:22,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466237568] [2022-03-20 19:15:22,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:22,896 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 19:15:22,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:22,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 19:15:22,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=564, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:15:22,897 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 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) [2022-03-20 19:15:23,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:23,038 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2022-03-20 19:15:23,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 19:15:23,038 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 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 18 [2022-03-20 19:15:23,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:23,039 INFO L225 Difference]: With dead ends: 25 [2022-03-20 19:15:23,039 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 19:15:23,039 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=183, Invalid=1077, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 19:15:23,040 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:23,040 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 58 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:15:23,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 19:15:23,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 19:15:23,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 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) [2022-03-20 19:15:23,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2022-03-20 19:15:23,043 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2022-03-20 19:15:23,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:23,043 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2022-03-20 19:15:23,043 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 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) [2022-03-20 19:15:23,044 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2022-03-20 19:15:23,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 19:15:23,044 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:23,044 INFO L499 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:23,062 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:23,259 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,SelfDestructingSolverStorable12,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:23,260 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:23,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:23,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1363105478, now seen corresponding path program 13 times [2022-03-20 19:15:23,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:23,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [488541940] [2022-03-20 19:15:23,354 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:23,355 INFO L85 PathProgramCache]: Analyzing trace with hash 383595687, now seen corresponding path program 1 times [2022-03-20 19:15:23,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:23,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198125039] [2022-03-20 19:15:23,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:23,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:23,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:23,359 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:23,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:23,363 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:23,364 INFO L85 PathProgramCache]: Analyzing trace with hash 1363105478, now seen corresponding path program 14 times [2022-03-20 19:15:23,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:23,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564993708] [2022-03-20 19:15:23,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:23,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:23,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:23,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:23,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:23,511 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:23,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:23,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564993708] [2022-03-20 19:15:23,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564993708] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:23,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923324554] [2022-03-20 19:15:23,512 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:15:23,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:23,512 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:23,513 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:15:23,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 19:15:23,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:15:23,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:23,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 19:15:23,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:23,730 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:23,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:23,959 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:23,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923324554] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:23,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:23,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 30 [2022-03-20 19:15:23,960 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:23,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [488541940] [2022-03-20 19:15:23,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [488541940] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:23,960 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:23,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:15:23,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570133063] [2022-03-20 19:15:23,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:23,960 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:15:23,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:23,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:15:23,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=698, Unknown=0, NotChecked=0, Total=870 [2022-03-20 19:15:23,961 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 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) [2022-03-20 19:15:24,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:24,123 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-20 19:15:24,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:15:24,124 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 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 [2022-03-20 19:15:24,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:24,125 INFO L225 Difference]: With dead ends: 26 [2022-03-20 19:15:24,125 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 19:15:24,125 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=222, Invalid=1338, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 19:15:24,126 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:24,126 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 63 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:15:24,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 19:15:24,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 19:15:24,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 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) [2022-03-20 19:15:24,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-03-20 19:15:24,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2022-03-20 19:15:24,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:24,129 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-03-20 19:15:24,129 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 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) [2022-03-20 19:15:24,129 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-03-20 19:15:24,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 19:15:24,129 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:24,129 INFO L499 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:24,160 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:24,339 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,SelfDestructingSolverStorable14,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:24,340 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:24,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:24,340 INFO L85 PathProgramCache]: Analyzing trace with hash -658014312, now seen corresponding path program 15 times [2022-03-20 19:15:24,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:24,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [34978272] [2022-03-20 19:15:24,468 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:24,469 INFO L85 PathProgramCache]: Analyzing trace with hash 442701031, now seen corresponding path program 1 times [2022-03-20 19:15:24,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:24,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472193259] [2022-03-20 19:15:24,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:24,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:24,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:24,472 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:24,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:24,478 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:24,478 INFO L85 PathProgramCache]: Analyzing trace with hash -658014312, now seen corresponding path program 16 times [2022-03-20 19:15:24,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:24,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301828809] [2022-03-20 19:15:24,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:24,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:24,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:24,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:24,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:24,579 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:24,580 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:24,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301828809] [2022-03-20 19:15:24,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301828809] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:24,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088321371] [2022-03-20 19:15:24,580 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:15:24,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:24,580 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:24,581 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:15:24,582 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 19:15:24,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:15:24,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:24,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 19:15:24,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:24,795 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 28 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:24,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:29,517 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:29,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088321371] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:29,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:29,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 33 [2022-03-20 19:15:29,518 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:29,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [34978272] [2022-03-20 19:15:29,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [34978272] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:29,518 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:29,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:15:29,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860824391] [2022-03-20 19:15:29,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:29,518 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:15:29,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:29,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:15:29,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=844, Unknown=2, NotChecked=0, Total=1056 [2022-03-20 19:15:29,519 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-03-20 19:15:30,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:30,055 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2022-03-20 19:15:30,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:15:30,056 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 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 20 [2022-03-20 19:15:30,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:30,056 INFO L225 Difference]: With dead ends: 27 [2022-03-20 19:15:30,056 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 19:15:30,057 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=265, Invalid=1625, Unknown=2, NotChecked=0, Total=1892 [2022-03-20 19:15:30,057 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:30,058 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 68 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:15:30,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 19:15:30,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 19:15:30,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 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) [2022-03-20 19:15:30,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2022-03-20 19:15:30,061 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2022-03-20 19:15:30,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:30,061 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2022-03-20 19:15:30,061 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-03-20 19:15:30,061 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2022-03-20 19:15:30,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 19:15:30,061 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:30,061 INFO L499 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:30,092 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:30,262 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15,SelfDestructingSolverStorable16 [2022-03-20 19:15:30,262 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:30,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:30,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1111781638, now seen corresponding path program 17 times [2022-03-20 19:15:30,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:30,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2138918925] [2022-03-20 19:15:30,591 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:30,591 INFO L85 PathProgramCache]: Analyzing trace with hash 501806375, now seen corresponding path program 1 times [2022-03-20 19:15:30,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:30,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741554301] [2022-03-20 19:15:30,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:30,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:30,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:30,596 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:30,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:30,606 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:30,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1111781638, now seen corresponding path program 18 times [2022-03-20 19:15:30,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:30,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499645242] [2022-03-20 19:15:30,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:30,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:30,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:30,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:30,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:30,943 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:30,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499645242] [2022-03-20 19:15:30,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499645242] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:30,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781142147] [2022-03-20 19:15:30,944 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:15:30,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:30,944 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:30,945 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:15:30,946 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 19:15:30,974 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-03-20 19:15:30,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:30,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 19:15:30,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:31,799 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 21 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:31,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:38,995 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:38,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781142147] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:38,995 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:38,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 39 [2022-03-20 19:15:38,995 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:38,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2138918925] [2022-03-20 19:15:38,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2138918925] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:38,996 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:38,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:15:38,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554885938] [2022-03-20 19:15:38,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:38,996 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:15:38,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:38,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:15:38,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1267, Unknown=3, NotChecked=0, Total=1482 [2022-03-20 19:15:38,997 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-03-20 19:15:39,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:39,582 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2022-03-20 19:15:39,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:15:39,583 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 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 21 [2022-03-20 19:15:39,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:39,583 INFO L225 Difference]: With dead ends: 28 [2022-03-20 19:15:39,583 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 19:15:39,584 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=272, Invalid=2275, Unknown=3, NotChecked=0, Total=2550 [2022-03-20 19:15:39,584 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:39,585 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:15:39,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 19:15:39,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 19:15:39,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 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) [2022-03-20 19:15:39,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-03-20 19:15:39,588 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2022-03-20 19:15:39,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:39,589 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-03-20 19:15:39,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-03-20 19:15:39,589 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-03-20 19:15:39,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 19:15:39,589 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:39,589 INFO L499 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:39,606 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-03-20 19:15:39,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 19:15:39,799 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:39,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:39,800 INFO L85 PathProgramCache]: Analyzing trace with hash 140881240, now seen corresponding path program 19 times [2022-03-20 19:15:39,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:39,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [442472155] [2022-03-20 19:15:40,175 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:40,176 INFO L85 PathProgramCache]: Analyzing trace with hash 560911719, now seen corresponding path program 1 times [2022-03-20 19:15:40,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:40,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175867275] [2022-03-20 19:15:40,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:40,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:40,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:40,182 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:40,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:40,189 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:40,189 INFO L85 PathProgramCache]: Analyzing trace with hash 140881240, now seen corresponding path program 20 times [2022-03-20 19:15:40,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:40,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570774584] [2022-03-20 19:15:40,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:40,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:40,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:40,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:40,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:40,437 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:40,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:40,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570774584] [2022-03-20 19:15:40,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570774584] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:40,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778229839] [2022-03-20 19:15:40,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:15:40,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:40,437 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:40,438 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:15:40,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 19:15:40,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:15:40,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:40,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 19:15:40,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:41,064 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 36 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:41,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:15:42,244 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:42,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778229839] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:15:42,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:15:42,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 42 [2022-03-20 19:15:42,244 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:42,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [442472155] [2022-03-20 19:15:42,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [442472155] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:42,245 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:42,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:15:42,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409859458] [2022-03-20 19:15:42,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:42,245 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:15:42,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:42,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:15:42,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=1448, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 19:15:42,246 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 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) [2022-03-20 19:15:43,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:43,019 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2022-03-20 19:15:43,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 19:15:43,019 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 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 22 [2022-03-20 19:15:43,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:43,021 INFO L225 Difference]: With dead ends: 29 [2022-03-20 19:15:43,022 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 19:15:43,022 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=339, Invalid=2631, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 19:15:43,024 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:43,024 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 78 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:15:43,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 19:15:43,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-20 19:15:43,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 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) [2022-03-20 19:15:43,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2022-03-20 19:15:43,033 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2022-03-20 19:15:43,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:43,033 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2022-03-20 19:15:43,033 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 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) [2022-03-20 19:15:43,033 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2022-03-20 19:15:43,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 19:15:43,034 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:43,034 INFO L499 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:43,052 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 19:15:43,250 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 19:15:43,250 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:43,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:43,250 INFO L85 PathProgramCache]: Analyzing trace with hash 107739974, now seen corresponding path program 21 times [2022-03-20 19:15:43,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:43,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [932005300] [2022-03-20 19:15:43,553 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:43,554 INFO L85 PathProgramCache]: Analyzing trace with hash 620017063, now seen corresponding path program 1 times [2022-03-20 19:15:43,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:43,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715401806] [2022-03-20 19:15:43,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:43,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:43,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:43,558 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:15:43,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:15:43,561 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:15:43,561 INFO L85 PathProgramCache]: Analyzing trace with hash 107739974, now seen corresponding path program 22 times [2022-03-20 19:15:43,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:43,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311142955] [2022-03-20 19:15:43,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:43,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:43,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:43,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:43,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:43,912 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:43,912 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:43,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311142955] [2022-03-20 19:15:43,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311142955] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:15:43,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189520450] [2022-03-20 19:15:43,912 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:15:43,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:15:43,913 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:15:43,914 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:15:43,915 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 19:15:43,944 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:15:43,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:15:43,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 19:15:43,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:15:44,714 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 55 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:44,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:02,231 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:02,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189520450] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:02,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:02,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 42 [2022-03-20 19:16:02,232 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:02,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [932005300] [2022-03-20 19:16:02,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [932005300] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:02,232 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:02,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 19:16:02,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946576531] [2022-03-20 19:16:02,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:02,232 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 19:16:02,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:02,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 19:16:02,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=1366, Unknown=8, NotChecked=0, Total=1722 [2022-03-20 19:16:02,233 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 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) [2022-03-20 19:16:03,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:03,329 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-03-20 19:16:03,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 19:16:03,330 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 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 23 [2022-03-20 19:16:03,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:03,330 INFO L225 Difference]: With dead ends: 30 [2022-03-20 19:16:03,330 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 19:16:03,331 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=418, Invalid=2654, Unknown=8, NotChecked=0, Total=3080 [2022-03-20 19:16:03,332 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:03,332 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 83 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:16:03,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 19:16:03,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 19:16:03,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 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) [2022-03-20 19:16:03,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2022-03-20 19:16:03,335 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2022-03-20 19:16:03,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:03,335 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2022-03-20 19:16:03,335 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 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) [2022-03-20 19:16:03,335 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2022-03-20 19:16:03,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 19:16:03,336 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:03,336 INFO L499 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:03,352 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-20 19:16:03,536 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21,SelfDestructingSolverStorable22 [2022-03-20 19:16:03,537 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:03,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:03,537 INFO L85 PathProgramCache]: Analyzing trace with hash -919639272, now seen corresponding path program 23 times [2022-03-20 19:16:03,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:03,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1594265004] [2022-03-20 19:16:03,832 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:03,832 INFO L85 PathProgramCache]: Analyzing trace with hash 679122407, now seen corresponding path program 1 times [2022-03-20 19:16:03,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:03,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885756254] [2022-03-20 19:16:03,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:03,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:03,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:03,836 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:03,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:03,856 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:03,856 INFO L85 PathProgramCache]: Analyzing trace with hash -919639272, now seen corresponding path program 24 times [2022-03-20 19:16:03,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:03,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640757712] [2022-03-20 19:16:03,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:03,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:03,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:04,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:04,348 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:04,348 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:04,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640757712] [2022-03-20 19:16:04,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640757712] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:04,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281601528] [2022-03-20 19:16:04,348 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:16:04,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:04,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:04,350 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:04,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 19:16:04,383 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 19:16:04,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:04,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 19:16:04,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:05,070 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 66 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:05,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:06,446 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:06,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281601528] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:06,446 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:06,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 45 [2022-03-20 19:16:06,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:06,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1594265004] [2022-03-20 19:16:06,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1594265004] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:06,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:06,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 19:16:06,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426677896] [2022-03-20 19:16:06,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:06,447 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 19:16:06,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:06,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 19:16:06,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=1578, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 19:16:06,448 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 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) [2022-03-20 19:16:07,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:07,695 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2022-03-20 19:16:07,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 19:16:07,695 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 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 24 [2022-03-20 19:16:07,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:07,696 INFO L225 Difference]: With dead ends: 31 [2022-03-20 19:16:07,696 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 19:16:07,697 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=477, Invalid=3063, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 19:16:07,697 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:07,697 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 88 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 19:16:07,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 19:16:07,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-20 19:16:07,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 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) [2022-03-20 19:16:07,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2022-03-20 19:16:07,702 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2022-03-20 19:16:07,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:07,703 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2022-03-20 19:16:07,703 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 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) [2022-03-20 19:16:07,703 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2022-03-20 19:16:07,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 19:16:07,703 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:07,703 INFO L499 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:07,722 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 19:16:07,915 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23,SelfDestructingSolverStorable24 [2022-03-20 19:16:07,915 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:07,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:07,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1591342470, now seen corresponding path program 25 times [2022-03-20 19:16:07,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:07,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [685724162] [2022-03-20 19:16:08,358 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:08,358 INFO L85 PathProgramCache]: Analyzing trace with hash 738227751, now seen corresponding path program 1 times [2022-03-20 19:16:08,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:08,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619032112] [2022-03-20 19:16:08,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:08,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:08,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:08,362 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:08,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:08,366 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:08,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1591342470, now seen corresponding path program 26 times [2022-03-20 19:16:08,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:08,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947672541] [2022-03-20 19:16:08,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:08,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:08,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:08,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:08,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:08,968 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:08,969 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:08,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947672541] [2022-03-20 19:16:08,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947672541] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:08,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306249939] [2022-03-20 19:16:08,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:16:08,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:08,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:08,970 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:08,971 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 19:16:09,001 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:16:09,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:09,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 19:16:09,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 78 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:10,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:16,111 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:16,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306249939] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:16,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:16,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 48 [2022-03-20 19:16:16,112 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:16,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [685724162] [2022-03-20 19:16:16,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [685724162] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:16,112 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:16,113 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:16:16,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913749712] [2022-03-20 19:16:16,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:16,114 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:16:16,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:16,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:16:16,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1795, Unknown=1, NotChecked=0, Total=2256 [2022-03-20 19:16:16,115 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 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) [2022-03-20 19:16:17,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:17,735 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2022-03-20 19:16:17,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 19:16:17,735 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 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 25 [2022-03-20 19:16:17,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:17,736 INFO L225 Difference]: With dead ends: 32 [2022-03-20 19:16:17,736 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 19:16:17,737 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=540, Invalid=3491, Unknown=1, NotChecked=0, Total=4032 [2022-03-20 19:16:17,737 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:17,737 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 93 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 19:16:17,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 19:16:17,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 19:16:17,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 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) [2022-03-20 19:16:17,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-03-20 19:16:17,741 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2022-03-20 19:16:17,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:17,742 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-03-20 19:16:17,742 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 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) [2022-03-20 19:16:17,742 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-03-20 19:16:17,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 19:16:17,743 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:17,743 INFO L499 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:17,761 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-20 19:16:17,961 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25,SelfDestructingSolverStorable26 [2022-03-20 19:16:17,961 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:17,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:17,961 INFO L85 PathProgramCache]: Analyzing trace with hash 2122365144, now seen corresponding path program 27 times [2022-03-20 19:16:17,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:17,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [748839841] [2022-03-20 19:16:18,418 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:18,418 INFO L85 PathProgramCache]: Analyzing trace with hash 797333095, now seen corresponding path program 1 times [2022-03-20 19:16:18,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:18,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776316997] [2022-03-20 19:16:18,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:18,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:18,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:18,422 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:18,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:18,426 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:18,426 INFO L85 PathProgramCache]: Analyzing trace with hash 2122365144, now seen corresponding path program 28 times [2022-03-20 19:16:18,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:18,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388441505] [2022-03-20 19:16:18,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:18,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:18,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:19,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:19,062 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:19,062 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:19,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388441505] [2022-03-20 19:16:19,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388441505] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:19,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564402939] [2022-03-20 19:16:19,062 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:16:19,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:19,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:19,064 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:19,065 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 19:16:19,098 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:16:19,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:19,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 19:16:19,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:20,338 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 91 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:20,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:24,805 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:24,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564402939] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:24,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:24,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 51 [2022-03-20 19:16:24,806 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:24,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [748839841] [2022-03-20 19:16:24,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [748839841] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:24,806 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:24,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 19:16:24,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501836537] [2022-03-20 19:16:24,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:24,807 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 19:16:24,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:24,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 19:16:24,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=522, Invalid=2027, Unknown=1, NotChecked=0, Total=2550 [2022-03-20 19:16:24,808 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 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) [2022-03-20 19:16:26,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:26,477 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2022-03-20 19:16:26,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 19:16:26,477 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 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 26 [2022-03-20 19:16:26,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:26,478 INFO L225 Difference]: With dead ends: 33 [2022-03-20 19:16:26,478 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 19:16:26,479 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=607, Invalid=3948, Unknown=1, NotChecked=0, Total=4556 [2022-03-20 19:16:26,479 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:26,479 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 98 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 19:16:26,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 19:16:26,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 19:16:26,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 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) [2022-03-20 19:16:26,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2022-03-20 19:16:26,483 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2022-03-20 19:16:26,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:26,483 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2022-03-20 19:16:26,484 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 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) [2022-03-20 19:16:26,484 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2022-03-20 19:16:26,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 19:16:26,484 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:26,484 INFO L499 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:26,501 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 19:16:26,699 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,SelfDestructingSolverStorable28,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:26,700 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:26,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:26,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1404198854, now seen corresponding path program 29 times [2022-03-20 19:16:26,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:26,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [494576338] [2022-03-20 19:16:27,129 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:27,129 INFO L85 PathProgramCache]: Analyzing trace with hash 856438439, now seen corresponding path program 1 times [2022-03-20 19:16:27,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:27,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36078968] [2022-03-20 19:16:27,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:27,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:27,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:27,133 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:27,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:27,138 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:27,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1404198854, now seen corresponding path program 30 times [2022-03-20 19:16:27,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:27,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478066194] [2022-03-20 19:16:27,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:27,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:27,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:27,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:27,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:27,900 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:27,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:27,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478066194] [2022-03-20 19:16:27,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478066194] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:27,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658855801] [2022-03-20 19:16:27,901 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:16:27,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:27,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:27,902 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:27,912 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 19:16:27,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2022-03-20 19:16:27,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:27,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 19:16:27,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:29,322 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 105 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:29,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:32,089 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:32,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658855801] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:32,090 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:32,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 54 [2022-03-20 19:16:32,090 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:32,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [494576338] [2022-03-20 19:16:32,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [494576338] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:32,090 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:32,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 19:16:32,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186776925] [2022-03-20 19:16:32,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:32,090 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 19:16:32,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:32,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 19:16:32,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=588, Invalid=2274, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 19:16:32,091 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 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) [2022-03-20 19:16:34,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:34,132 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2022-03-20 19:16:34,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 19:16:34,132 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 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 27 [2022-03-20 19:16:34,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:34,133 INFO L225 Difference]: With dead ends: 34 [2022-03-20 19:16:34,133 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 19:16:34,134 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=678, Invalid=4434, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 19:16:34,135 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:34,135 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 103 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:16:34,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 19:16:34,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 19:16:34,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 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) [2022-03-20 19:16:34,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2022-03-20 19:16:34,144 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2022-03-20 19:16:34,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:34,144 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2022-03-20 19:16:34,144 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 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) [2022-03-20 19:16:34,144 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2022-03-20 19:16:34,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 19:16:34,146 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:34,146 INFO L499 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:34,163 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 19:16:34,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable30,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:34,360 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:34,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:34,360 INFO L85 PathProgramCache]: Analyzing trace with hash 615880344, now seen corresponding path program 31 times [2022-03-20 19:16:34,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:34,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [355217836] [2022-03-20 19:16:34,765 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:34,766 INFO L85 PathProgramCache]: Analyzing trace with hash 915543783, now seen corresponding path program 1 times [2022-03-20 19:16:34,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:34,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969856862] [2022-03-20 19:16:34,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:34,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:34,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:34,769 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:34,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:34,772 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:34,772 INFO L85 PathProgramCache]: Analyzing trace with hash 615880344, now seen corresponding path program 32 times [2022-03-20 19:16:34,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:34,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414587019] [2022-03-20 19:16:34,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:34,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:34,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:35,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:35,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:35,586 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:35,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:35,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414587019] [2022-03-20 19:16:35,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414587019] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:35,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308254973] [2022-03-20 19:16:35,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:16:35,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:35,587 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:35,588 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:35,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 19:16:35,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:16:35,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:35,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 19:16:35,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:36,971 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 120 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:36,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:16:40,202 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:40,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308254973] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:16:40,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:16:40,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 57 [2022-03-20 19:16:40,203 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:40,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [355217836] [2022-03-20 19:16:40,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [355217836] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:40,203 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:40,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 19:16:40,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776181635] [2022-03-20 19:16:40,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:40,203 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 19:16:40,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:40,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 19:16:40,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=658, Invalid=2534, Unknown=0, NotChecked=0, Total=3192 [2022-03-20 19:16:40,205 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 20 states have internal predecessors, (24), 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) [2022-03-20 19:16:42,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:42,615 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2022-03-20 19:16:42,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 19:16:42,616 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 20 states have internal predecessors, (24), 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 28 [2022-03-20 19:16:42,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:42,616 INFO L225 Difference]: With dead ends: 35 [2022-03-20 19:16:42,616 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 19:16:42,618 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1256 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=753, Invalid=4947, Unknown=0, NotChecked=0, Total=5700 [2022-03-20 19:16:42,618 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:42,618 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 108 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 19:16:42,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 19:16:42,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 19:16:42,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 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) [2022-03-20 19:16:42,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2022-03-20 19:16:42,623 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2022-03-20 19:16:42,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:42,623 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2022-03-20 19:16:42,623 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 20 states have internal predecessors, (24), 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) [2022-03-20 19:16:42,623 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2022-03-20 19:16:42,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 19:16:42,623 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:42,623 INFO L499 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:42,642 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 19:16:42,824 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-03-20 19:16:42,824 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:42,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:42,825 INFO L85 PathProgramCache]: Analyzing trace with hash 1947810310, now seen corresponding path program 33 times [2022-03-20 19:16:42,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:42,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [197875657] [2022-03-20 19:16:43,169 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:43,170 INFO L85 PathProgramCache]: Analyzing trace with hash 974649127, now seen corresponding path program 1 times [2022-03-20 19:16:43,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:43,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84711535] [2022-03-20 19:16:43,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:43,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:43,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:43,173 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:16:43,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:16:43,176 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:16:43,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1947810310, now seen corresponding path program 34 times [2022-03-20 19:16:43,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:43,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932209898] [2022-03-20 19:16:43,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:43,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:43,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:44,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:44,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:44,115 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:44,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:44,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932209898] [2022-03-20 19:16:44,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932209898] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:16:44,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215221349] [2022-03-20 19:16:44,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:16:44,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:16:44,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:16:44,117 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:16:44,118 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 19:16:44,150 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:16:44,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:16:44,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 19:16:44,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:16:45,842 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 136 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:45,842 INFO L328 TraceCheckSpWp]: Computing backward predicates...