/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/nla-digbench-scaling/bresenham-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 19:43:35,866 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 19:43:35,868 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 19:43:35,909 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 19:43:35,952 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 19:43:35,953 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 19:43:35,954 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 19:43:35,955 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 19:43:35,965 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 19:43:35,966 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 19:43:35,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 19:43:35,967 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 19:43:35,967 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 19:43:35,967 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 19:43:35,967 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 19:43:35,967 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 19:43:35,968 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 19:43:35,968 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 19:43:35,968 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 19:43:35,968 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:43:35,969 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 19:43:35,969 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 19:43:35,970 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 19:43:35,970 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 19:43:35,970 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 19:43:36,154 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 19:43:36,172 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 19:43:36,174 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 19:43:36,175 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 19:43:36,175 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 19:43:36,176 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c [2022-03-20 19:43:36,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1a5f3ccf/e8405aace9024db8a859ecbb9deb732b/FLAGd3acf393a [2022-03-20 19:43:36,586 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 19:43:36,586 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c [2022-03-20 19:43:36,590 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1a5f3ccf/e8405aace9024db8a859ecbb9deb732b/FLAGd3acf393a [2022-03-20 19:43:36,599 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1a5f3ccf/e8405aace9024db8a859ecbb9deb732b [2022-03-20 19:43:36,602 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 19:43:36,603 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 19:43:36,608 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 19:43:36,608 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 19:43:36,611 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 19:43:36,611 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,612 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c94e92f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36, skipping insertion in model container [2022-03-20 19:43:36,612 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,618 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 19:43:36,632 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 19:43:36,783 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c[597,610] [2022-03-20 19:43:36,799 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:43:36,808 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 19:43:36,815 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound20.c[597,610] [2022-03-20 19:43:36,821 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:43:36,831 INFO L208 MainTranslator]: Completed translation [2022-03-20 19:43:36,832 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36 WrapperNode [2022-03-20 19:43:36,832 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 19:43:36,833 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 19:43:36,833 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 19:43:36,833 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 19:43:36,841 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,842 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,847 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,847 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,851 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,854 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,855 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,857 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 19:43:36,857 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 19:43:36,857 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 19:43:36,858 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 19:43:36,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (1/1) ... [2022-03-20 19:43:36,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:43:36,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:36,892 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 19:43:36,894 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 19:43:36,919 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 19:43:36,920 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 19:43:36,920 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 19:43:36,920 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 19:43:36,920 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 19:43:36,920 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 19:43:36,920 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 19:43:36,920 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 19:43:36,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 19:43:36,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 19:43:36,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 19:43:36,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 19:43:36,922 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 19:43:36,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 19:43:36,969 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 19:43:36,970 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 19:43:37,130 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 19:43:37,135 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 19:43:37,135 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 19:43:37,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:43:37 BoogieIcfgContainer [2022-03-20 19:43:37,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 19:43:37,138 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 19:43:37,138 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 19:43:37,145 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 19:43:37,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 07:43:36" (1/3) ... [2022-03-20 19:43:37,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623f5cd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:43:37, skipping insertion in model container [2022-03-20 19:43:37,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:43:36" (2/3) ... [2022-03-20 19:43:37,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623f5cd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:43:37, skipping insertion in model container [2022-03-20 19:43:37,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:43:37" (3/3) ... [2022-03-20 19:43:37,148 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_valuebound20.c [2022-03-20 19:43:37,152 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 19:43:37,152 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 19:43:37,188 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 19:43:37,193 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 19:43:37,193 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 19:43:37,205 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 19:43:37,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 19:43:37,211 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:37,212 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:37,213 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:37,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:37,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1867489771, now seen corresponding path program 1 times [2022-03-20 19:43:37,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:37,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1995282749] [2022-03-20 19:43:37,235 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:37,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1867489771, now seen corresponding path program 2 times [2022-03-20 19:43:37,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:37,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808540951] [2022-03-20 19:43:37,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:37,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:43:37,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:43:37,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:43:37,448 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 19:43:37,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:43:37,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 19:43:37,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:43:37,477 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 19:43:37,478 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:37,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808540951] [2022-03-20 19:43:37,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808540951] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:37,479 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:37,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 19:43:37,481 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:37,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1995282749] [2022-03-20 19:43:37,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1995282749] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:37,481 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:37,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 19:43:37,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528095843] [2022-03-20 19:43:37,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:37,485 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 19:43:37,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:37,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 19:43:37,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 19:43:37,514 INFO L87 Difference]: Start difference. First operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 19:43:37,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:37,592 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-03-20 19:43:37,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 19:43:37,594 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-20 19:43:37,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:37,602 INFO L225 Difference]: With dead ends: 57 [2022-03-20 19:43:37,602 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 19:43:37,605 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 19:43:37,608 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:37,610 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 34 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:43:37,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 19:43:37,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 19:43:37,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 19:43:37,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-03-20 19:43:37,645 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2022-03-20 19:43:37,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:37,645 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-03-20 19:43:37,645 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 19:43:37,645 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-03-20 19:43:37,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 19:43:37,646 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:37,647 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:37,647 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 19:43:37,647 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:37,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:37,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1827672217, now seen corresponding path program 1 times [2022-03-20 19:43:37,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:37,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1184012426] [2022-03-20 19:43:37,649 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:37,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1827672217, now seen corresponding path program 2 times [2022-03-20 19:43:37,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:37,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821438994] [2022-03-20 19:43:37,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:37,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:37,680 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:37,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [762250704] [2022-03-20 19:43:37,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:43:37,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:37,681 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:37,688 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 19:43:37,691 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 19:43:37,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 19:43:37,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:37,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 19:43:37,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:37,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 19:43:37,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 19:43:37,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:37,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821438994] [2022-03-20 19:43:37,954 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:37,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762250704] [2022-03-20 19:43:37,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762250704] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:37,954 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:37,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 19:43:37,955 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:37,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1184012426] [2022-03-20 19:43:37,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1184012426] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:37,956 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:37,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 19:43:37,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817930968] [2022-03-20 19:43:37,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:37,957 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 19:43:37,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:37,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 19:43:37,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 19:43:37,958 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 19:43:38,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:38,078 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-03-20 19:43:38,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 19:43:38,079 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2022-03-20 19:43:38,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:38,080 INFO L225 Difference]: With dead ends: 39 [2022-03-20 19:43:38,081 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 19:43:38,081 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 19:43:38,082 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:38,083 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 101 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:43:38,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 19:43:38,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-03-20 19:43:38,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 19:43:38,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-03-20 19:43:38,097 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 23 [2022-03-20 19:43:38,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:38,098 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-03-20 19:43:38,099 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 19:43:38,099 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-03-20 19:43:38,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 19:43:38,100 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:38,100 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:38,130 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 19:43:38,327 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:38,328 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:38,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:38,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1419291471, now seen corresponding path program 1 times [2022-03-20 19:43:38,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:38,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [924484641] [2022-03-20 19:43:38,330 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:38,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1419291471, now seen corresponding path program 2 times [2022-03-20 19:43:38,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:38,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073945494] [2022-03-20 19:43:38,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:38,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:38,344 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:38,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1327743838] [2022-03-20 19:43:38,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:43:38,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:38,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:38,346 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 19:43:38,353 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 19:43:38,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:43:38,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:38,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 19:43:38,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:38,708 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 19:43:38,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 19:43:38,859 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:38,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073945494] [2022-03-20 19:43:38,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:38,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327743838] [2022-03-20 19:43:38,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327743838] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:38,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:38,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2022-03-20 19:43:38,861 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:38,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [924484641] [2022-03-20 19:43:38,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [924484641] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:38,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:38,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:43:38,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056770974] [2022-03-20 19:43:38,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:38,862 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 19:43:38,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:38,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 19:43:38,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-03-20 19:43:38,863 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 19:43:39,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:39,034 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2022-03-20 19:43:39,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 19:43:39,034 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-20 19:43:39,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:39,037 INFO L225 Difference]: With dead ends: 48 [2022-03-20 19:43:39,037 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 19:43:39,039 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-03-20 19:43:39,042 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 25 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:39,042 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 129 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:43:39,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 19:43:39,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-20 19:43:39,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 19:43:39,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2022-03-20 19:43:39,053 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 32 [2022-03-20 19:43:39,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:39,054 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2022-03-20 19:43:39,054 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 19:43:39,054 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2022-03-20 19:43:39,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 19:43:39,055 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:39,055 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:39,076 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 19:43:39,267 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 19:43:39,268 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:39,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:39,268 INFO L85 PathProgramCache]: Analyzing trace with hash 355715891, now seen corresponding path program 1 times [2022-03-20 19:43:39,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:39,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1630664665] [2022-03-20 19:43:39,269 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:39,269 INFO L85 PathProgramCache]: Analyzing trace with hash 355715891, now seen corresponding path program 2 times [2022-03-20 19:43:39,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:39,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323143141] [2022-03-20 19:43:39,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:39,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:39,281 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:39,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2017468892] [2022-03-20 19:43:39,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:43:39,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:39,282 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:39,283 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 19:43:39,300 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 19:43:39,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:43:39,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:39,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 19:43:39,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:39,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 19:43:39,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:39,656 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 19:43:39,657 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323143141] [2022-03-20 19:43:39,657 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017468892] [2022-03-20 19:43:39,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017468892] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:39,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:39,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2022-03-20 19:43:39,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:39,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1630664665] [2022-03-20 19:43:39,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1630664665] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:39,658 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:39,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 19:43:39,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431694356] [2022-03-20 19:43:39,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:39,659 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 19:43:39,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:39,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 19:43:39,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-20 19:43:39,660 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 19:43:39,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:39,782 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2022-03-20 19:43:39,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 19:43:39,782 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-20 19:43:39,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:39,784 INFO L225 Difference]: With dead ends: 56 [2022-03-20 19:43:39,784 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 19:43:39,784 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-03-20 19:43:39,785 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 11 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:39,785 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 183 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:43:39,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 19:43:39,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2022-03-20 19:43:39,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 19:43:39,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-03-20 19:43:39,797 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 32 [2022-03-20 19:43:39,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:39,797 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-03-20 19:43:39,797 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 19:43:39,798 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-03-20 19:43:39,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 19:43:39,798 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:39,799 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:39,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 19:43:40,014 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:40,015 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:40,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:40,016 INFO L85 PathProgramCache]: Analyzing trace with hash 125050924, now seen corresponding path program 1 times [2022-03-20 19:43:40,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:40,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [289037424] [2022-03-20 19:43:40,016 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:40,017 INFO L85 PathProgramCache]: Analyzing trace with hash 125050924, now seen corresponding path program 2 times [2022-03-20 19:43:40,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:40,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939302439] [2022-03-20 19:43:40,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:40,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:40,032 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:40,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [130253739] [2022-03-20 19:43:40,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:43:40,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:40,033 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:40,038 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 19:43:40,040 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 19:43:40,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:43:40,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:40,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 19:43:40,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:40,319 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:40,322 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:40,325 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:41,322 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 19:43:41,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:41,860 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 19:43:41,860 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:41,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939302439] [2022-03-20 19:43:41,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:41,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130253739] [2022-03-20 19:43:41,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130253739] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:41,865 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:41,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2022-03-20 19:43:41,865 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:41,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [289037424] [2022-03-20 19:43:41,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [289037424] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:41,865 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:41,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:43:41,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367582244] [2022-03-20 19:43:41,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:41,866 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:43:41,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:41,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:43:41,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-03-20 19:43:41,867 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:46,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:43:46,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:46,894 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-03-20 19:43:46,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:43:46,895 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 39 [2022-03-20 19:43:46,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:46,896 INFO L225 Difference]: With dead ends: 61 [2022-03-20 19:43:46,896 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 19:43:46,896 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=116, Invalid=586, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:43:46,897 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 18 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:46,897 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 217 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2022-03-20 19:43:46,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 19:43:46,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 43. [2022-03-20 19:43:46,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 19:43:46,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2022-03-20 19:43:46,906 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 39 [2022-03-20 19:43:46,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:46,907 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2022-03-20 19:43:46,907 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:46,907 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2022-03-20 19:43:46,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 19:43:46,908 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:46,908 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:46,934 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 19:43:47,123 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:47,123 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:47,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:47,124 INFO L85 PathProgramCache]: Analyzing trace with hash 733948825, now seen corresponding path program 3 times [2022-03-20 19:43:47,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:47,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1573352952] [2022-03-20 19:43:47,125 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:47,125 INFO L85 PathProgramCache]: Analyzing trace with hash 733948825, now seen corresponding path program 4 times [2022-03-20 19:43:47,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:47,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140773380] [2022-03-20 19:43:47,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:47,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:47,135 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:47,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [108710279] [2022-03-20 19:43:47,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:43:47,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:47,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:47,139 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 19:43:47,141 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 19:43:47,181 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:43:47,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:47,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 19:43:47,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:47,398 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:47,500 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 19:43:47,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:47,738 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:43:47,738 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:47,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140773380] [2022-03-20 19:43:47,738 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:47,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108710279] [2022-03-20 19:43:47,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108710279] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:47,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:47,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2022-03-20 19:43:47,739 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:47,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1573352952] [2022-03-20 19:43:47,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1573352952] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:47,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:47,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:43:47,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363769691] [2022-03-20 19:43:47,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:47,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:43:47,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:47,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:43:47,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-20 19:43:47,741 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:48,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:48,093 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2022-03-20 19:43:48,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:43:48,095 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2022-03-20 19:43:48,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:48,096 INFO L225 Difference]: With dead ends: 61 [2022-03-20 19:43:48,097 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 19:43:48,097 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-03-20 19:43:48,098 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:48,098 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 240 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:43:48,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 19:43:48,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-03-20 19:43:48,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.131578947368421) internal successors, (43), 40 states have internal predecessors, (43), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 19:43:48,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2022-03-20 19:43:48,114 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 41 [2022-03-20 19:43:48,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:48,115 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2022-03-20 19:43:48,115 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:48,115 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2022-03-20 19:43:48,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 19:43:48,121 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:48,121 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:48,145 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 19:43:48,335 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:48,336 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:48,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:48,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1786011109, now seen corresponding path program 1 times [2022-03-20 19:43:48,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:48,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [244072320] [2022-03-20 19:43:48,336 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:48,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1786011109, now seen corresponding path program 2 times [2022-03-20 19:43:48,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:48,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121683702] [2022-03-20 19:43:48,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:48,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:48,346 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:48,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [436442493] [2022-03-20 19:43:48,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:43:48,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:48,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:48,349 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 19:43:48,350 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 19:43:48,402 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:43:48,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:48,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 19:43:48,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:48,674 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 19:43:48,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:48,891 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:43:48,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:48,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121683702] [2022-03-20 19:43:48,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:48,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436442493] [2022-03-20 19:43:48,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436442493] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:48,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:48,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2022-03-20 19:43:48,892 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:48,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [244072320] [2022-03-20 19:43:48,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [244072320] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:48,892 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:48,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:43:48,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341956502] [2022-03-20 19:43:48,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:48,893 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:43:48,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:48,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:43:48,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2022-03-20 19:43:48,893 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:49,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:43:49,091 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2022-03-20 19:43:49,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:43:49,091 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2022-03-20 19:43:49,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:43:49,093 INFO L225 Difference]: With dead ends: 72 [2022-03-20 19:43:49,093 INFO L226 Difference]: Without dead ends: 70 [2022-03-20 19:43:49,094 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:43:49,094 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 16 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:43:49,095 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 232 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:43:49,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-20 19:43:49,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 59. [2022-03-20 19:43:49,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 43 states have internal predecessors, (46), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 19:43:49,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2022-03-20 19:43:49,107 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 41 [2022-03-20 19:43:49,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:43:49,107 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2022-03-20 19:43:49,108 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:49,108 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2022-03-20 19:43:49,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 19:43:49,108 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:43:49,109 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:43:49,131 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 19:43:49,329 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:49,329 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:43:49,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:43:49,330 INFO L85 PathProgramCache]: Analyzing trace with hash -287119529, now seen corresponding path program 3 times [2022-03-20 19:43:49,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:49,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1523002963] [2022-03-20 19:43:49,330 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:43:49,330 INFO L85 PathProgramCache]: Analyzing trace with hash -287119529, now seen corresponding path program 4 times [2022-03-20 19:43:49,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:43:49,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077957352] [2022-03-20 19:43:49,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:43:49,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:43:49,340 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:43:49,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567954385] [2022-03-20 19:43:49,340 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:43:49,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:43:49,341 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:43:49,345 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 19:43:49,346 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 19:43:49,397 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:43:49,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:43:49,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 19:43:49,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:43:49,743 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:49,748 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:43:51,986 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 19:43:51,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:43:52,573 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:43:52,574 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:43:52,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077957352] [2022-03-20 19:43:52,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:43:52,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567954385] [2022-03-20 19:43:52,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567954385] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:43:52,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:43:52,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 20 [2022-03-20 19:43:52,575 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:43:52,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1523002963] [2022-03-20 19:43:52,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1523002963] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:43:52,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:43:52,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:43:52,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575549818] [2022-03-20 19:43:52,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:43:52,575 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:43:52,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:43:52,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:43:52,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=319, Unknown=1, NotChecked=0, Total=380 [2022-03-20 19:43:52,576 INFO L87 Difference]: Start difference. First operand 59 states and 64 transitions. Second operand has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:43:54,663 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:43:56,715 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.97s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:43:58,719 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:00,740 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:04,784 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:06,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:07,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:07,429 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2022-03-20 19:44:07,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:44:07,429 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2022-03-20 19:44:07,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:07,430 INFO L225 Difference]: With dead ends: 86 [2022-03-20 19:44:07,430 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 19:44:07,431 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=98, Invalid=500, Unknown=2, NotChecked=0, Total=600 [2022-03-20 19:44:07,431 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 8 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:07,432 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 208 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 231 Invalid, 5 Unknown, 0 Unchecked, 12.3s Time] [2022-03-20 19:44:07,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 19:44:07,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-20 19:44:07,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 19:44:07,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-20 19:44:07,455 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 41 [2022-03-20 19:44:07,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:07,455 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-20 19:44:07,455 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:44:07,455 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-20 19:44:07,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 19:44:07,456 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:07,456 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:07,463 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 19:44:07,661 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:07,661 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:07,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:07,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1487887833, now seen corresponding path program 3 times [2022-03-20 19:44:07,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:07,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1753367370] [2022-03-20 19:44:07,662 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:07,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1487887833, now seen corresponding path program 4 times [2022-03-20 19:44:07,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:07,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409947867] [2022-03-20 19:44:07,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:07,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:07,670 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:07,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [614296842] [2022-03-20 19:44:07,671 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:44:07,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:07,671 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:07,672 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 19:44:07,676 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 19:44:07,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:44:07,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:07,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 19:44:07,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:07,999 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 19:44:07,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:08,330 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 19:44:08,330 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:08,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409947867] [2022-03-20 19:44:08,330 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:08,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614296842] [2022-03-20 19:44:08,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614296842] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:08,330 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:08,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-03-20 19:44:08,331 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:08,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1753367370] [2022-03-20 19:44:08,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1753367370] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:08,331 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:08,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:44:08,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904824296] [2022-03-20 19:44:08,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:08,332 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 19:44:08,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:08,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 19:44:08,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2022-03-20 19:44:08,333 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:44:08,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:08,568 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2022-03-20 19:44:08,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 19:44:08,569 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2022-03-20 19:44:08,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:08,570 INFO L225 Difference]: With dead ends: 86 [2022-03-20 19:44:08,570 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 19:44:08,570 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:44:08,571 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 11 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:08,571 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 254 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:44:08,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 19:44:08,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 73. [2022-03-20 19:44:08,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 19:44:08,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-20 19:44:08,589 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 41 [2022-03-20 19:44:08,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:08,589 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-20 19:44:08,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 19:44:08,590 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-20 19:44:08,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 19:44:08,591 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:08,591 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:08,598 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 19:44:08,796 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,SelfDestructingSolverStorable8 [2022-03-20 19:44:08,796 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:08,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:08,797 INFO L85 PathProgramCache]: Analyzing trace with hash 651179076, now seen corresponding path program 1 times [2022-03-20 19:44:08,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:08,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [41045829] [2022-03-20 19:44:08,798 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:08,798 INFO L85 PathProgramCache]: Analyzing trace with hash 651179076, now seen corresponding path program 2 times [2022-03-20 19:44:08,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:08,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190058942] [2022-03-20 19:44:08,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:08,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:08,820 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:08,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [556388947] [2022-03-20 19:44:08,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:44:08,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:08,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:08,823 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 19:44:08,824 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 19:44:08,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:44:08,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:08,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 19:44:08,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:09,053 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 19:44:09,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:09,222 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 19:44:09,223 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:09,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190058942] [2022-03-20 19:44:09,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:09,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556388947] [2022-03-20 19:44:09,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556388947] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:09,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:09,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-20 19:44:09,224 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:09,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [41045829] [2022-03-20 19:44:09,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [41045829] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:09,224 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:09,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 19:44:09,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481357423] [2022-03-20 19:44:09,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:09,224 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 19:44:09,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:09,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 19:44:09,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-20 19:44:09,225 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:09,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:09,310 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-03-20 19:44:09,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 19:44:09,311 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 48 [2022-03-20 19:44:09,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:09,312 INFO L225 Difference]: With dead ends: 87 [2022-03-20 19:44:09,312 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 19:44:09,312 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-20 19:44:09,313 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:09,313 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 146 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:44:09,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 19:44:09,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2022-03-20 19:44:09,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 57 states have internal predecessors, (60), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 19:44:09,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 84 transitions. [2022-03-20 19:44:09,345 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 84 transitions. Word has length 48 [2022-03-20 19:44:09,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:09,345 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 84 transitions. [2022-03-20 19:44:09,345 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:09,345 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 84 transitions. [2022-03-20 19:44:09,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 19:44:09,346 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:09,346 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:09,373 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 19:44:09,570 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 19:44:09,571 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:09,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:09,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1154259258, now seen corresponding path program 3 times [2022-03-20 19:44:09,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:09,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [475557613] [2022-03-20 19:44:09,572 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:09,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1154259258, now seen corresponding path program 4 times [2022-03-20 19:44:09,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:09,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030788387] [2022-03-20 19:44:09,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:09,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:09,584 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:09,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [479380739] [2022-03-20 19:44:09,584 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:44:09,584 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:09,585 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:09,589 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 19:44:09,613 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 19:44:09,639 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:44:09,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:09,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 19:44:09,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:10,125 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:10,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:10,473 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 19:44:10,473 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:10,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030788387] [2022-03-20 19:44:10,473 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:10,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479380739] [2022-03-20 19:44:10,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479380739] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:10,473 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:10,474 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 24 [2022-03-20 19:44:10,474 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:10,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [475557613] [2022-03-20 19:44:10,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [475557613] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:10,474 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:10,474 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:44:10,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330172878] [2022-03-20 19:44:10,475 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:10,475 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:44:10,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:10,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:44:10,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:44:10,476 INFO L87 Difference]: Start difference. First operand 76 states and 84 transitions. Second operand has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:10,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:10,799 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-03-20 19:44:10,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 19:44:10,799 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 48 [2022-03-20 19:44:10,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:10,800 INFO L225 Difference]: With dead ends: 87 [2022-03-20 19:44:10,800 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 19:44:10,801 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2022-03-20 19:44:10,801 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:10,801 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 260 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:44:10,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 19:44:10,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 73. [2022-03-20 19:44:10,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 19:44:10,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2022-03-20 19:44:10,822 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 48 [2022-03-20 19:44:10,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:10,823 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2022-03-20 19:44:10,823 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:10,823 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2022-03-20 19:44:10,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:10,824 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:10,824 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:10,854 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 19:44:11,048 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 19:44:11,048 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:11,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:11,048 INFO L85 PathProgramCache]: Analyzing trace with hash -463038031, now seen corresponding path program 5 times [2022-03-20 19:44:11,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:11,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1403178848] [2022-03-20 19:44:11,049 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:11,049 INFO L85 PathProgramCache]: Analyzing trace with hash -463038031, now seen corresponding path program 6 times [2022-03-20 19:44:11,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:11,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657126408] [2022-03-20 19:44:11,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:11,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:11,057 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:11,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1352568480] [2022-03-20 19:44:11,057 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:44:11,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:11,057 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:11,058 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 19:44:11,060 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 19:44:11,104 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 19:44:11,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:11,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 19:44:11,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:11,345 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:11,448 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:11,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:11,685 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:44:11,685 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:11,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657126408] [2022-03-20 19:44:11,685 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:11,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352568480] [2022-03-20 19:44:11,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352568480] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:11,686 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:11,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 19 [2022-03-20 19:44:11,686 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:11,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1403178848] [2022-03-20 19:44:11,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1403178848] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:11,686 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:11,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:44:11,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805369015] [2022-03-20 19:44:11,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:11,687 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:44:11,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:11,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:44:11,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2022-03-20 19:44:11,688 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:12,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:12,160 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2022-03-20 19:44:12,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:44:12,160 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:12,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:12,161 INFO L225 Difference]: With dead ends: 88 [2022-03-20 19:44:12,161 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 19:44:12,162 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:44:12,162 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 17 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:12,162 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 277 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:44:12,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 19:44:12,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 75. [2022-03-20 19:44:12,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 55 states have internal predecessors, (61), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 19:44:12,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 83 transitions. [2022-03-20 19:44:12,178 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 83 transitions. Word has length 50 [2022-03-20 19:44:12,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:12,178 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 83 transitions. [2022-03-20 19:44:12,178 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:12,178 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 83 transitions. [2022-03-20 19:44:12,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:12,179 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:12,179 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:12,197 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 19:44:12,385 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,SelfDestructingSolverStorable11 [2022-03-20 19:44:12,385 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:12,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:12,385 INFO L85 PathProgramCache]: Analyzing trace with hash 1311969331, now seen corresponding path program 5 times [2022-03-20 19:44:12,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:12,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1139615375] [2022-03-20 19:44:12,386 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:12,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1311969331, now seen corresponding path program 6 times [2022-03-20 19:44:12,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:12,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790550212] [2022-03-20 19:44:12,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:12,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:12,399 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:12,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1394153107] [2022-03-20 19:44:12,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:44:12,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:12,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:12,401 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 19:44:12,406 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 19:44:12,450 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 19:44:12,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:12,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-20 19:44:12,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:12,721 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:12,835 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:12,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:13,103 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:44:13,103 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:13,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790550212] [2022-03-20 19:44:13,103 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:13,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394153107] [2022-03-20 19:44:13,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394153107] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:13,104 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:13,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 20 [2022-03-20 19:44:13,104 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:13,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1139615375] [2022-03-20 19:44:13,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1139615375] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:13,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:13,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:44:13,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777891757] [2022-03-20 19:44:13,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:13,105 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:44:13,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:13,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:44:13,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:44:13,106 INFO L87 Difference]: Start difference. First operand 75 states and 83 transitions. Second operand has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:15,130 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:17,275 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:19,294 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:44:19,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:19,597 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2022-03-20 19:44:19,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:44:19,598 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:19,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:19,599 INFO L225 Difference]: With dead ends: 88 [2022-03-20 19:44:19,599 INFO L226 Difference]: Without dead ends: 86 [2022-03-20 19:44:19,599 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:44:19,600 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 19 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 4 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:19,600 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 281 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 355 Invalid, 3 Unknown, 0 Unchecked, 6.4s Time] [2022-03-20 19:44:19,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-20 19:44:19,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 82. [2022-03-20 19:44:19,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 59 states have (on average 1.11864406779661) internal successors, (66), 61 states have internal predecessors, (66), 13 states have call successors, (13), 10 states have call predecessors, (13), 9 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 19:44:19,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2022-03-20 19:44:19,618 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 50 [2022-03-20 19:44:19,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:19,618 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2022-03-20 19:44:19,619 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:19,619 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2022-03-20 19:44:19,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:19,619 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:19,619 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:19,637 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 19:44:19,827 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,SelfDestructingSolverStorable12 [2022-03-20 19:44:19,827 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:19,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:19,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1484106385, now seen corresponding path program 7 times [2022-03-20 19:44:19,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:19,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [347051112] [2022-03-20 19:44:19,828 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:19,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1484106385, now seen corresponding path program 8 times [2022-03-20 19:44:19,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:19,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640442526] [2022-03-20 19:44:19,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:19,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:19,836 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:19,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1601728537] [2022-03-20 19:44:19,836 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:44:19,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:19,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:19,837 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 19:44:19,843 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 19:44:19,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:44:19,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:19,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-20 19:44:19,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:20,110 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:20,113 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:20,114 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:20,120 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:20,122 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:36,044 WARN L232 SmtUtils]: Spent 5.37s on a formula simplification. DAG size of input: 14 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-03-20 19:44:36,218 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:36,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:44:37,229 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:37,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640442526] [2022-03-20 19:44:37,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:37,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601728537] [2022-03-20 19:44:37,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601728537] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:37,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:37,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 21 [2022-03-20 19:44:37,230 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:37,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [347051112] [2022-03-20 19:44:37,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [347051112] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:37,230 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:37,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:44:37,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89859836] [2022-03-20 19:44:37,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:37,231 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:44:37,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:37,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:44:37,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:44:37,232 INFO L87 Difference]: Start difference. First operand 82 states and 90 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:42,629 INFO L93 Difference]: Finished difference Result 96 states and 106 transitions. [2022-03-20 19:44:42,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:44:42,629 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:42,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:42,630 INFO L225 Difference]: With dead ends: 96 [2022-03-20 19:44:42,630 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 19:44:42,630 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=88, Invalid=561, Unknown=1, NotChecked=0, Total=650 [2022-03-20 19:44:42,631 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 17 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:42,631 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 315 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 314 Invalid, 0 Unknown, 29 Unchecked, 0.7s Time] [2022-03-20 19:44:42,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 19:44:42,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2022-03-20 19:44:42,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 63 states have (on average 1.126984126984127) internal successors, (71), 65 states have internal predecessors, (71), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 19:44:42,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2022-03-20 19:44:42,661 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 50 [2022-03-20 19:44:42,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:42,662 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2022-03-20 19:44:42,662 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:42,662 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2022-03-20 19:44:42,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:42,662 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:42,662 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:42,680 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 19:44:42,866 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,SelfDestructingSolverStorable13 [2022-03-20 19:44:42,866 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:42,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:42,867 INFO L85 PathProgramCache]: Analyzing trace with hash 290900977, now seen corresponding path program 9 times [2022-03-20 19:44:42,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:42,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1803535478] [2022-03-20 19:44:42,867 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:42,868 INFO L85 PathProgramCache]: Analyzing trace with hash 290900977, now seen corresponding path program 10 times [2022-03-20 19:44:42,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:42,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143907255] [2022-03-20 19:44:42,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:42,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:42,875 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:42,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [942507411] [2022-03-20 19:44:42,875 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:44:42,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:42,875 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:42,876 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 19:44:42,880 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 19:44:42,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:44:42,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:42,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 19:44:42,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:43,005 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 19:44:43,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:43,101 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 19:44:43,101 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:43,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143907255] [2022-03-20 19:44:43,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:43,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942507411] [2022-03-20 19:44:43,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942507411] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:43,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:43,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-20 19:44:43,102 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:43,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1803535478] [2022-03-20 19:44:43,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1803535478] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:43,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:43,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 19:44:43,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846288633] [2022-03-20 19:44:43,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:43,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 19:44:43,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:43,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 19:44:43,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 19:44:43,103 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:43,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:43,166 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2022-03-20 19:44:43,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 19:44:43,166 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:43,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:43,167 INFO L225 Difference]: With dead ends: 121 [2022-03-20 19:44:43,167 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 19:44:43,168 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2022-03-20 19:44:43,168 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:43,168 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 105 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:44:43,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 19:44:43,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2022-03-20 19:44:43,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 76 states have (on average 1.131578947368421) internal successors, (86), 79 states have internal predecessors, (86), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 19:44:43,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 120 transitions. [2022-03-20 19:44:43,193 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 120 transitions. Word has length 50 [2022-03-20 19:44:43,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:43,193 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 120 transitions. [2022-03-20 19:44:43,193 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:43,194 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 120 transitions. [2022-03-20 19:44:43,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:43,194 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:43,194 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:43,210 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-20 19:44:43,394 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:43,395 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:43,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:43,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1452517941, now seen corresponding path program 11 times [2022-03-20 19:44:43,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:43,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [161786556] [2022-03-20 19:44:43,396 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:43,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1452517941, now seen corresponding path program 12 times [2022-03-20 19:44:43,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:43,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214758056] [2022-03-20 19:44:43,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:43,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:43,404 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:43,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217281544] [2022-03-20 19:44:43,404 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:44:43,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:43,404 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:43,405 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 19:44:43,406 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 19:44:43,447 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 19:44:43,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:43,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 19:44:43,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:43,853 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 19:44:43,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:44,235 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 19:44:44,235 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:44,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214758056] [2022-03-20 19:44:44,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:44,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217281544] [2022-03-20 19:44:44,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217281544] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:44,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:44,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 21 [2022-03-20 19:44:44,236 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:44,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [161786556] [2022-03-20 19:44:44,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [161786556] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:44,236 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:44,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:44:44,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245531989] [2022-03-20 19:44:44,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:44,236 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:44:44,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:44,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:44:44,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:44:44,237 INFO L87 Difference]: Start difference. First operand 104 states and 120 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:44,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:44,505 INFO L93 Difference]: Finished difference Result 117 states and 135 transitions. [2022-03-20 19:44:44,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:44:44,506 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:44,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:44,507 INFO L225 Difference]: With dead ends: 117 [2022-03-20 19:44:44,507 INFO L226 Difference]: Without dead ends: 115 [2022-03-20 19:44:44,507 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:44:44,508 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 22 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:44,508 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 315 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:44:44,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-03-20 19:44:44,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2022-03-20 19:44:44,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 81 states have (on average 1.123456790123457) internal successors, (91), 85 states have internal predecessors, (91), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (17), 14 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 19:44:44,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 127 transitions. [2022-03-20 19:44:44,540 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 127 transitions. Word has length 50 [2022-03-20 19:44:44,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:44,540 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 127 transitions. [2022-03-20 19:44:44,541 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:44,541 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 127 transitions. [2022-03-20 19:44:44,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:44,541 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:44,541 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:44,569 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 19:44:44,755 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 19:44:44,755 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:44,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:44,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1343557775, now seen corresponding path program 13 times [2022-03-20 19:44:44,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:44,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1156477821] [2022-03-20 19:44:44,756 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:44,757 INFO L85 PathProgramCache]: Analyzing trace with hash -1343557775, now seen corresponding path program 14 times [2022-03-20 19:44:44,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:44,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921778836] [2022-03-20 19:44:44,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:44,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:44,764 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:44,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [671668633] [2022-03-20 19:44:44,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:44:44,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:44,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:44,766 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 19:44:44,768 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 19:44:44,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:44:44,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:44,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 19:44:44,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:45,175 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:45,178 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:45,180 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:45,348 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:45,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:45,928 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:44:45,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:45,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921778836] [2022-03-20 19:44:45,928 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671668633] [2022-03-20 19:44:45,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671668633] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:45,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:45,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 22 [2022-03-20 19:44:45,929 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1156477821] [2022-03-20 19:44:45,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1156477821] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:45,929 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:45,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:44:45,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54416252] [2022-03-20 19:44:45,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:45,930 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:44:45,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:45,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:44:45,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2022-03-20 19:44:45,931 INFO L87 Difference]: Start difference. First operand 111 states and 127 transitions. Second operand has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:46,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:46,662 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2022-03-20 19:44:46,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 19:44:46,662 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:46,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:46,663 INFO L225 Difference]: With dead ends: 134 [2022-03-20 19:44:46,664 INFO L226 Difference]: Without dead ends: 121 [2022-03-20 19:44:46,664 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:44:46,664 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:46,665 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 278 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:44:46,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-20 19:44:46,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-03-20 19:44:46,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 89 states have (on average 1.1235955056179776) internal successors, (100), 93 states have internal predecessors, (100), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:44:46,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 138 transitions. [2022-03-20 19:44:46,705 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 138 transitions. Word has length 50 [2022-03-20 19:44:46,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:46,705 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 138 transitions. [2022-03-20 19:44:46,706 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:46,706 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 138 transitions. [2022-03-20 19:44:46,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:44:46,706 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:46,706 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:46,732 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 19:44:46,930 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 19:44:46,930 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:46,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:46,930 INFO L85 PathProgramCache]: Analyzing trace with hash 431449587, now seen corresponding path program 5 times [2022-03-20 19:44:46,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:46,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1338983177] [2022-03-20 19:44:46,931 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:46,931 INFO L85 PathProgramCache]: Analyzing trace with hash 431449587, now seen corresponding path program 6 times [2022-03-20 19:44:46,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:46,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320619043] [2022-03-20 19:44:46,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:46,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:46,937 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:46,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1506288755] [2022-03-20 19:44:46,937 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:44:46,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:46,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:46,944 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 19:44:46,967 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 19:44:46,994 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 19:44:46,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:46,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-20 19:44:46,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:47,549 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 19:44:47,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:47,794 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:44:47,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:47,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320619043] [2022-03-20 19:44:47,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:47,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506288755] [2022-03-20 19:44:47,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506288755] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:47,795 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:47,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 22 [2022-03-20 19:44:47,795 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:47,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1338983177] [2022-03-20 19:44:47,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1338983177] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:47,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:47,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 19:44:47,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539791185] [2022-03-20 19:44:47,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:47,795 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 19:44:47,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:47,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 19:44:47,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2022-03-20 19:44:47,796 INFO L87 Difference]: Start difference. First operand 121 states and 138 transitions. Second operand has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:48,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:48,190 INFO L93 Difference]: Finished difference Result 142 states and 159 transitions. [2022-03-20 19:44:48,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 19:44:48,191 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 50 [2022-03-20 19:44:48,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:48,192 INFO L225 Difference]: With dead ends: 142 [2022-03-20 19:44:48,192 INFO L226 Difference]: Without dead ends: 140 [2022-03-20 19:44:48,192 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:44:48,193 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 18 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:48,193 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 332 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:44:48,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-03-20 19:44:48,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 129. [2022-03-20 19:44:48,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 95 states have (on average 1.1157894736842104) internal successors, (106), 99 states have internal predecessors, (106), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:44:48,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2022-03-20 19:44:48,220 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 50 [2022-03-20 19:44:48,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:48,221 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2022-03-20 19:44:48,221 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:44:48,221 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2022-03-20 19:44:48,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 19:44:48,221 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:48,222 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:48,239 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-20 19:44:48,426 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 19:44:48,427 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:48,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:48,427 INFO L85 PathProgramCache]: Analyzing trace with hash 850213676, now seen corresponding path program 3 times [2022-03-20 19:44:48,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:48,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1146397651] [2022-03-20 19:44:48,428 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:48,428 INFO L85 PathProgramCache]: Analyzing trace with hash 850213676, now seen corresponding path program 4 times [2022-03-20 19:44:48,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:48,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978965986] [2022-03-20 19:44:48,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:48,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:48,434 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:48,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768527918] [2022-03-20 19:44:48,434 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:44:48,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:48,434 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:48,436 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:44:48,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 19:44:48,467 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:44:48,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:48,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 19:44:48,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:48,653 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:44:48,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:44:48,869 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:44:48,869 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:44:48,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978965986] [2022-03-20 19:44:48,869 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:44:48,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768527918] [2022-03-20 19:44:48,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768527918] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:44:48,869 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:44:48,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-03-20 19:44:48,870 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:44:48,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1146397651] [2022-03-20 19:44:48,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1146397651] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:44:48,870 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:44:48,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 19:44:48,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031941184] [2022-03-20 19:44:48,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:44:48,870 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 19:44:48,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:48,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 19:44:48,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-20 19:44:48,871 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:44:48,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:44:48,990 INFO L93 Difference]: Finished difference Result 140 states and 155 transitions. [2022-03-20 19:44:48,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 19:44:48,990 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2022-03-20 19:44:48,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:44:48,991 INFO L225 Difference]: With dead ends: 140 [2022-03-20 19:44:48,991 INFO L226 Difference]: Without dead ends: 132 [2022-03-20 19:44:48,992 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-20 19:44:48,992 INFO L913 BasicCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:44:48,992 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 175 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:44:48,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-20 19:44:49,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2022-03-20 19:44:49,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 96 states have (on average 1.1145833333333333) internal successors, (107), 99 states have internal predecessors, (107), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:44:49,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 145 transitions. [2022-03-20 19:44:49,028 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 145 transitions. Word has length 57 [2022-03-20 19:44:49,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:44:49,028 INFO L478 AbstractCegarLoop]: Abstraction has 130 states and 145 transitions. [2022-03-20 19:44:49,028 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 9 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:44:49,028 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 145 transitions. [2022-03-20 19:44:49,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 19:44:49,029 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:44:49,029 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:44:49,048 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 19:44:49,229 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:49,229 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:44:49,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:44:49,230 INFO L85 PathProgramCache]: Analyzing trace with hash 55892592, now seen corresponding path program 5 times [2022-03-20 19:44:49,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:44:49,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [353074485] [2022-03-20 19:44:49,230 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:44:49,230 INFO L85 PathProgramCache]: Analyzing trace with hash 55892592, now seen corresponding path program 6 times [2022-03-20 19:44:49,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:44:49,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746912808] [2022-03-20 19:44:49,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:44:49,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:44:49,236 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:44:49,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1031842361] [2022-03-20 19:44:49,236 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:44:49,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:44:49,237 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:44:49,238 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:44:49,246 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 19:44:49,618 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 19:44:49,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:44:49,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 19:44:49,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:44:50,710 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:50,713 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:44:50,715 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:45:07,805 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 25 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-03-20 19:45:07,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:45:08,874 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:45:10,438 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:45:32,728 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 19:45:32,728 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:45:32,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746912808] [2022-03-20 19:45:32,729 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:45:32,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031842361] [2022-03-20 19:45:32,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031842361] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:45:32,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:45:32,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13] total 27 [2022-03-20 19:45:32,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:45:32,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [353074485] [2022-03-20 19:45:32,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [353074485] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:45:32,730 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:45:32,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:45:32,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277525692] [2022-03-20 19:45:32,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:45:32,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:45:32,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:45:32,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:45:32,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=586, Unknown=3, NotChecked=0, Total=702 [2022-03-20 19:45:32,731 INFO L87 Difference]: Start difference. First operand 130 states and 145 transitions. Second operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 19:45:38,194 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:45:42,224 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:45:44,668 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:45:50,589 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:46:02,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:46:02,896 INFO L93 Difference]: Finished difference Result 145 states and 162 transitions. [2022-03-20 19:46:02,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 19:46:02,897 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 57 [2022-03-20 19:46:02,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:46:02,898 INFO L225 Difference]: With dead ends: 145 [2022-03-20 19:46:02,898 INFO L226 Difference]: Without dead ends: 135 [2022-03-20 19:46:02,899 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=361, Invalid=1616, Unknown=3, NotChecked=0, Total=1980 [2022-03-20 19:46:02,899 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 24 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.7s IncrementalHoareTripleChecker+Time [2022-03-20 19:46:02,899 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 175 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 375 Invalid, 4 Unknown, 0 Unchecked, 11.7s Time] [2022-03-20 19:46:02,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-03-20 19:46:02,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 128. [2022-03-20 19:46:02,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 99 states have internal predecessors, (103), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:46:02,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 141 transitions. [2022-03-20 19:46:02,930 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 141 transitions. Word has length 57 [2022-03-20 19:46:02,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:46:02,930 INFO L478 AbstractCegarLoop]: Abstraction has 128 states and 141 transitions. [2022-03-20 19:46:02,930 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 19:46:02,931 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 141 transitions. [2022-03-20 19:46:02,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 19:46:02,931 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:46:02,931 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:46:02,939 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 19:46:03,132 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:46:03,132 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:46:03,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:46:03,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1124973290, now seen corresponding path program 7 times [2022-03-20 19:46:03,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:46:03,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [984096311] [2022-03-20 19:46:03,133 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:46:03,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1124973290, now seen corresponding path program 8 times [2022-03-20 19:46:03,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:46:03,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605505351] [2022-03-20 19:46:03,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:46:03,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:46:03,138 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:46:03,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1225630074] [2022-03-20 19:46:03,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:46:03,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:46:03,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:46:03,140 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:46:03,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 19:46:03,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:46:03,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:46:03,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 19:46:03,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:46:04,187 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:46:04,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:46:05,595 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:46:05,595 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:46:05,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605505351] [2022-03-20 19:46:05,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:46:05,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225630074] [2022-03-20 19:46:05,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225630074] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:46:05,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:46:05,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 23 [2022-03-20 19:46:05,596 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:46:05,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [984096311] [2022-03-20 19:46:05,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [984096311] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:46:05,596 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:46:05,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:46:05,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680781168] [2022-03-20 19:46:05,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:46:05,596 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:46:05,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:46:05,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:46:05,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:46:05,597 INFO L87 Difference]: Start difference. First operand 128 states and 141 transitions. Second operand has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:46:06,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:46:06,365 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2022-03-20 19:46:06,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:46:06,366 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2022-03-20 19:46:06,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:46:06,367 INFO L225 Difference]: With dead ends: 141 [2022-03-20 19:46:06,367 INFO L226 Difference]: Without dead ends: 133 [2022-03-20 19:46:06,367 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-03-20 19:46:06,368 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 9 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:46:06,368 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 294 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:46:06,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-03-20 19:46:06,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2022-03-20 19:46:06,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 97 states have (on average 1.092783505154639) internal successors, (106), 102 states have internal predecessors, (106), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 19:46:06,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 146 transitions. [2022-03-20 19:46:06,399 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 146 transitions. Word has length 57 [2022-03-20 19:46:06,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:46:06,399 INFO L478 AbstractCegarLoop]: Abstraction has 132 states and 146 transitions. [2022-03-20 19:46:06,399 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:46:06,399 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 146 transitions. [2022-03-20 19:46:06,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 19:46:06,400 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:46:06,400 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:46:06,416 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 19:46:06,600 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 19:46:06,601 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:46:06,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:46:06,601 INFO L85 PathProgramCache]: Analyzing trace with hash -680465044, now seen corresponding path program 5 times [2022-03-20 19:46:06,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:46:06,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [81883735] [2022-03-20 19:46:06,601 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:46:06,601 INFO L85 PathProgramCache]: Analyzing trace with hash -680465044, now seen corresponding path program 6 times [2022-03-20 19:46:06,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:46:06,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222603098] [2022-03-20 19:46:06,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:46:06,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:46:06,607 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:46:06,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1501954088] [2022-03-20 19:46:06,608 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:46:06,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:46:06,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:46:06,609 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:46:06,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 19:46:07,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 19:46:07,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:46:07,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 19:46:07,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:46:07,438 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:46:07,440 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:46:07,441 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:46:15,581 WARN L833 $PredicateComparison]: unable to prove that (and (let ((.cse3 (+ c_main_~X~0 1)) (.cse2 (+ (* (- 1) c_main_~Y~0) (div (+ c_main_~v~0 c_main_~X~0) 2) (* c_main_~X~0 c_main_~y~0))) (.cse0 (= c_main_~Y~0 0)) (.cse4 (= (mod (+ (* 2 c_main_~X~0 c_main_~y~0) c_main_~v~0 c_main_~X~0) 2) 0))) (or (let ((.cse1 (div .cse2 c_main_~Y~0))) (and (not .cse0) (not (<= .cse1 c_main_~X~0)) (= (mod .cse2 c_main_~Y~0) 0) (= c_main_~xy~0 (* c_main_~y~0 .cse1)) (<= .cse1 .cse3) (= c_main_~yx~0 (* c_main_~Y~0 .cse1)) .cse4)) (and (let ((.cse6 (= c_main_~y~0 0))) (or (let ((.cse5 (div c_main_~xy~0 c_main_~y~0))) (and (<= .cse5 .cse3) (= (mod c_main_~xy~0 c_main_~y~0) 0) (not .cse6) (< c_main_~X~0 .cse5))) (and .cse6 (= c_main_~xy~0 0)))) (= 0 .cse2) .cse0 (= c_main_~yx~0 0) .cse4))) (<= 0 c_main_~X~0)) is different from false [2022-03-20 19:47:11,866 WARN L232 SmtUtils]: Spent 5.36s on a formula simplification. DAG size of input: 3 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-03-20 19:47:20,559 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 19:47:20,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:21,455 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 19:47:21,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222603098] [2022-03-20 19:47:21,455 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501954088] [2022-03-20 19:47:21,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501954088] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:21,456 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:21,456 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2022-03-20 19:47:21,456 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:21,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [81883735] [2022-03-20 19:47:21,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [81883735] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:21,456 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:21,456 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:47:21,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885042545] [2022-03-20 19:47:21,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:21,456 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:47:21,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:21,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:47:21,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=313, Unknown=1, NotChecked=36, Total=420 [2022-03-20 19:47:21,457 INFO L87 Difference]: Start difference. First operand 132 states and 146 transitions. Second operand has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:47:24,129 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse7 (* c_main_~X~0 c_main_~y~0)) (.cse3 (+ c_main_~X~0 1))) (and (let ((.cse2 (+ (* (- 1) c_main_~Y~0) (div (+ c_main_~v~0 c_main_~X~0) 2) .cse7)) (.cse0 (= c_main_~Y~0 0)) (.cse4 (= (mod (+ (* 2 c_main_~X~0 c_main_~y~0) c_main_~v~0 c_main_~X~0) 2) 0))) (or (let ((.cse1 (div .cse2 c_main_~Y~0))) (and (not .cse0) (not (<= .cse1 c_main_~X~0)) (= (mod .cse2 c_main_~Y~0) 0) (= c_main_~xy~0 (* c_main_~y~0 .cse1)) (<= .cse1 .cse3) (= c_main_~yx~0 (* c_main_~Y~0 .cse1)) .cse4)) (and (let ((.cse6 (= c_main_~y~0 0))) (or (let ((.cse5 (div c_main_~xy~0 c_main_~y~0))) (and (<= .cse5 .cse3) (= (mod c_main_~xy~0 c_main_~y~0) 0) (not .cse6) (< c_main_~X~0 .cse5))) (and .cse6 (= c_main_~xy~0 0)))) (= 0 .cse2) .cse0 (= c_main_~yx~0 0) .cse4))) (<= 0 c_main_~X~0) (not (<= c_main_~x~0 c_main_~X~0)) (= (+ (* 2 (* c_main_~Y~0 c_main_~x~0)) (* 2 c_main_~Y~0)) (+ (* 2 .cse7) c_main_~v~0 c_main_~X~0)) (<= c_main_~x~0 .cse3))) is different from false [2022-03-20 19:47:24,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:24,249 INFO L93 Difference]: Finished difference Result 139 states and 152 transitions. [2022-03-20 19:47:24,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:47:24,249 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 57 [2022-03-20 19:47:24,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:24,250 INFO L225 Difference]: With dead ends: 139 [2022-03-20 19:47:24,250 INFO L226 Difference]: Without dead ends: 131 [2022-03-20 19:47:24,251 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=170, Invalid=648, Unknown=2, NotChecked=110, Total=930 [2022-03-20 19:47:24,251 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 21 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:24,251 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 166 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 119 Invalid, 0 Unknown, 24 Unchecked, 0.2s Time] [2022-03-20 19:47:24,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-20 19:47:24,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2022-03-20 19:47:24,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.086021505376344) internal successors, (101), 97 states have internal predecessors, (101), 19 states have call successors, (19), 14 states have call predecessors, (19), 13 states have return successors, (18), 14 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:47:24,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 138 transitions. [2022-03-20 19:47:24,285 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 138 transitions. Word has length 57 [2022-03-20 19:47:24,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:24,285 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 138 transitions. [2022-03-20 19:47:24,285 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 19:47:24,286 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 138 transitions. [2022-03-20 19:47:24,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:24,286 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:24,286 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:24,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:24,488 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 19:47:24,488 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:24,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:24,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1830651545, now seen corresponding path program 7 times [2022-03-20 19:47:24,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:24,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1269945318] [2022-03-20 19:47:24,489 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:24,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1830651545, now seen corresponding path program 8 times [2022-03-20 19:47:24,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:24,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148914046] [2022-03-20 19:47:24,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:24,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:24,494 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:24,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [499622725] [2022-03-20 19:47:24,494 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:47:24,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:24,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:24,496 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:24,497 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 19:47:24,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:47:24,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:24,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-20 19:47:24,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:25,563 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:25,875 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-20 19:47:25,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:26,693 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 19:47:26,693 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:26,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148914046] [2022-03-20 19:47:26,693 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:26,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499622725] [2022-03-20 19:47:26,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499622725] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:26,694 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:26,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 24 [2022-03-20 19:47:26,694 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:26,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1269945318] [2022-03-20 19:47:26,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1269945318] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:26,694 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:26,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:47:26,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562225925] [2022-03-20 19:47:26,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:26,694 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:47:26,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:26,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:47:26,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:47:26,695 INFO L87 Difference]: Start difference. First operand 126 states and 138 transitions. Second operand has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:28,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:28,152 INFO L93 Difference]: Finished difference Result 143 states and 156 transitions. [2022-03-20 19:47:28,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 19:47:28,154 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:47:28,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:28,155 INFO L225 Difference]: With dead ends: 143 [2022-03-20 19:47:28,155 INFO L226 Difference]: Without dead ends: 141 [2022-03-20 19:47:28,155 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:47:28,156 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:28,156 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 333 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 19:47:28,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-03-20 19:47:28,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2022-03-20 19:47:28,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 103 states have (on average 1.087378640776699) internal successors, (112), 107 states have internal predecessors, (112), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 19:47:28,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 151 transitions. [2022-03-20 19:47:28,192 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 151 transitions. Word has length 59 [2022-03-20 19:47:28,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:28,192 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 151 transitions. [2022-03-20 19:47:28,192 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:28,192 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 151 transitions. [2022-03-20 19:47:28,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:28,193 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:28,193 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:28,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:28,417 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:28,417 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:28,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:28,417 INFO L85 PathProgramCache]: Analyzing trace with hash -689308389, now seen corresponding path program 15 times [2022-03-20 19:47:28,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:28,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1533688260] [2022-03-20 19:47:28,418 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:28,418 INFO L85 PathProgramCache]: Analyzing trace with hash -689308389, now seen corresponding path program 16 times [2022-03-20 19:47:28,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:28,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774252675] [2022-03-20 19:47:28,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:28,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:28,424 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:28,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1989702752] [2022-03-20 19:47:28,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:47:28,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:28,424 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:28,425 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:28,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 19:47:28,466 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:47:28,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:28,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 19:47:28,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:29,675 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:30,025 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-20 19:47:30,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:30,909 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 19:47:30,909 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:30,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774252675] [2022-03-20 19:47:30,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:30,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989702752] [2022-03-20 19:47:30,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989702752] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:30,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:30,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 26 [2022-03-20 19:47:30,910 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:30,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1533688260] [2022-03-20 19:47:30,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1533688260] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:30,910 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:30,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 19:47:30,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760303913] [2022-03-20 19:47:30,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:30,910 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 19:47:30,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:30,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 19:47:30,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:47:30,911 INFO L87 Difference]: Start difference. First operand 139 states and 151 transitions. Second operand has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:32,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:32,296 INFO L93 Difference]: Finished difference Result 150 states and 162 transitions. [2022-03-20 19:47:32,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 19:47:32,296 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:47:32,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:32,297 INFO L225 Difference]: With dead ends: 150 [2022-03-20 19:47:32,297 INFO L226 Difference]: Without dead ends: 148 [2022-03-20 19:47:32,298 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-03-20 19:47:32,298 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:32,298 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 304 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 19:47:32,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-20 19:47:32,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2022-03-20 19:47:32,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 108 states have (on average 1.0833333333333333) internal successors, (117), 113 states have internal predecessors, (117), 21 states have call successors, (21), 17 states have call predecessors, (21), 16 states have return successors, (20), 15 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-20 19:47:32,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 158 transitions. [2022-03-20 19:47:32,331 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 158 transitions. Word has length 59 [2022-03-20 19:47:32,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:32,332 INFO L478 AbstractCegarLoop]: Abstraction has 146 states and 158 transitions. [2022-03-20 19:47:32,332 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 19 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:32,332 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 158 transitions. [2022-03-20 19:47:32,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:32,333 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:32,333 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:32,351 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:32,539 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:32,539 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:32,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:32,539 INFO L85 PathProgramCache]: Analyzing trace with hash 809583191, now seen corresponding path program 17 times [2022-03-20 19:47:32,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:32,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [334854024] [2022-03-20 19:47:32,540 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:32,540 INFO L85 PathProgramCache]: Analyzing trace with hash 809583191, now seen corresponding path program 18 times [2022-03-20 19:47:32,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:32,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517238177] [2022-03-20 19:47:32,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:32,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:32,545 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:32,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [467438535] [2022-03-20 19:47:32,545 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:47:32,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:32,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:32,546 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:32,548 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 19:47:32,594 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 19:47:32,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:32,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 51 conjunts are in the unsatisfiable core [2022-03-20 19:47:32,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:33,631 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 40 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 19:47:33,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:34,140 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 19:47:34,141 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:34,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517238177] [2022-03-20 19:47:34,141 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:34,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467438535] [2022-03-20 19:47:34,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467438535] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:34,141 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:34,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10] total 23 [2022-03-20 19:47:34,141 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:34,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [334854024] [2022-03-20 19:47:34,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [334854024] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:34,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:34,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 19:47:34,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938867443] [2022-03-20 19:47:34,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:34,142 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 19:47:34,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:34,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 19:47:34,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:47:34,142 INFO L87 Difference]: Start difference. First operand 146 states and 158 transitions. Second operand has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:34,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:34,946 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2022-03-20 19:47:34,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 19:47:34,947 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:47:34,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:34,948 INFO L225 Difference]: With dead ends: 163 [2022-03-20 19:47:34,948 INFO L226 Difference]: Without dead ends: 161 [2022-03-20 19:47:34,948 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 92 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:47:34,949 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 17 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:34,949 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 309 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 19:47:34,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-03-20 19:47:34,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 136. [2022-03-20 19:47:34,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 104 states have internal predecessors, (110), 19 states have call successors, (19), 16 states have call predecessors, (19), 15 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 19:47:34,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 147 transitions. [2022-03-20 19:47:34,978 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 147 transitions. Word has length 59 [2022-03-20 19:47:34,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:34,979 INFO L478 AbstractCegarLoop]: Abstraction has 136 states and 147 transitions. [2022-03-20 19:47:34,979 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:34,979 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 147 transitions. [2022-03-20 19:47:34,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:34,980 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:34,980 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:34,997 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:35,183 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-20 19:47:35,183 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:35,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:35,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1971200155, now seen corresponding path program 19 times [2022-03-20 19:47:35,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:35,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1685879057] [2022-03-20 19:47:35,184 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:35,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1971200155, now seen corresponding path program 20 times [2022-03-20 19:47:35,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:35,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991101799] [2022-03-20 19:47:35,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:35,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:35,189 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:35,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [739521750] [2022-03-20 19:47:35,189 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:47:35,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:35,190 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:35,191 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:35,192 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 19:47:35,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:47:35,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:35,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 19:47:35,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:36,384 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:38,164 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:42,775 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 19:47:42,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:43,670 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 19:47:43,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:43,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991101799] [2022-03-20 19:47:43,671 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:43,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739521750] [2022-03-20 19:47:43,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739521750] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:43,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:43,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 28 [2022-03-20 19:47:43,671 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:43,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1685879057] [2022-03-20 19:47:43,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1685879057] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:43,672 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:43,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 19:47:43,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350972419] [2022-03-20 19:47:43,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:43,672 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 19:47:43,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:43,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 19:47:43,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=661, Unknown=2, NotChecked=0, Total=756 [2022-03-20 19:47:43,674 INFO L87 Difference]: Start difference. First operand 136 states and 147 transitions. Second operand has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:45,579 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.38s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:47:47,907 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:47:49,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:49,086 INFO L93 Difference]: Finished difference Result 161 states and 175 transitions. [2022-03-20 19:47:49,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 19:47:49,087 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:47:49,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:49,088 INFO L225 Difference]: With dead ends: 161 [2022-03-20 19:47:49,088 INFO L226 Difference]: Without dead ends: 159 [2022-03-20 19:47:49,088 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=137, Invalid=983, Unknown=2, NotChecked=0, Total=1122 [2022-03-20 19:47:49,089 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:49,089 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 220 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 647 Invalid, 1 Unknown, 0 Unchecked, 4.8s Time] [2022-03-20 19:47:49,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-03-20 19:47:49,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 150. [2022-03-20 19:47:49,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 112 states have (on average 1.0892857142857142) internal successors, (122), 115 states have internal predecessors, (122), 21 states have call successors, (21), 17 states have call predecessors, (21), 16 states have return successors, (20), 17 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-20 19:47:49,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 163 transitions. [2022-03-20 19:47:49,140 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 163 transitions. Word has length 59 [2022-03-20 19:47:49,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:49,140 INFO L478 AbstractCegarLoop]: Abstraction has 150 states and 163 transitions. [2022-03-20 19:47:49,141 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 1.85) internal successors, (37), 21 states have internal predecessors, (37), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:49,141 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 163 transitions. [2022-03-20 19:47:49,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:49,141 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:49,141 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:49,160 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:49,351 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 19:47:49,351 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:49,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:49,352 INFO L85 PathProgramCache]: Analyzing trace with hash -548759779, now seen corresponding path program 21 times [2022-03-20 19:47:49,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:49,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1467436108] [2022-03-20 19:47:49,352 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:49,352 INFO L85 PathProgramCache]: Analyzing trace with hash -548759779, now seen corresponding path program 22 times [2022-03-20 19:47:49,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:49,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130737486] [2022-03-20 19:47:49,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:49,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:49,356 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:49,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1161810578] [2022-03-20 19:47:49,357 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:47:49,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:49,357 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:49,358 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:49,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 19:47:49,406 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:47:49,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:49,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 19:47:49,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:50,209 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:47:50,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:47:51,192 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:47:51,193 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:47:51,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130737486] [2022-03-20 19:47:51,193 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:47:51,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161810578] [2022-03-20 19:47:51,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161810578] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:47:51,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:47:51,193 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-20 19:47:51,193 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:47:51,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1467436108] [2022-03-20 19:47:51,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1467436108] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:47:51,194 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:47:51,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:47:51,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892104435] [2022-03-20 19:47:51,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:47:51,194 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:47:51,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:51,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:47:51,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:47:51,195 INFO L87 Difference]: Start difference. First operand 150 states and 163 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:51,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:47:51,840 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2022-03-20 19:47:51,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:47:51,841 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:47:51,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:47:51,842 INFO L225 Difference]: With dead ends: 161 [2022-03-20 19:47:51,842 INFO L226 Difference]: Without dead ends: 159 [2022-03-20 19:47:51,842 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:47:51,842 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 19:47:51,843 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 322 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 19:47:51,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-03-20 19:47:51,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 141. [2022-03-20 19:47:51,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 108 states have internal predecessors, (114), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (19), 16 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 19:47:51,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 153 transitions. [2022-03-20 19:47:51,877 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 153 transitions. Word has length 59 [2022-03-20 19:47:51,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:47:51,877 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 153 transitions. [2022-03-20 19:47:51,877 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:47:51,877 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 153 transitions. [2022-03-20 19:47:51,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:47:51,878 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:47:51,878 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:47:51,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 19:47:52,079 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 19:47:52,079 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:47:52,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:47:52,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1434400107, now seen corresponding path program 23 times [2022-03-20 19:47:52,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:47:52,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1524982770] [2022-03-20 19:47:52,080 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:47:52,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1434400107, now seen corresponding path program 24 times [2022-03-20 19:47:52,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:47:52,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80872921] [2022-03-20 19:47:52,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:47:52,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:47:52,087 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:47:52,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1440383214] [2022-03-20 19:47:52,087 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:47:52,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:47:52,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:47:52,090 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:47:52,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 19:47:52,135 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 19:47:52,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:47:52,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 19:47:52,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:47:53,334 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:55,449 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:47:58,574 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 41 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-20 19:47:58,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:00,456 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 19:48:00,457 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:00,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80872921] [2022-03-20 19:48:00,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:00,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440383214] [2022-03-20 19:48:00,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440383214] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:00,457 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:00,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 10] total 28 [2022-03-20 19:48:00,457 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:00,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1524982770] [2022-03-20 19:48:00,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1524982770] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:00,458 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:00,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 19:48:00,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500297187] [2022-03-20 19:48:00,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:00,458 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 19:48:00,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:00,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 19:48:00,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=669, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:48:00,459 INFO L87 Difference]: Start difference. First operand 141 states and 153 transitions. Second operand has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:06,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:06,859 INFO L93 Difference]: Finished difference Result 166 states and 183 transitions. [2022-03-20 19:48:06,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 19:48:06,860 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:48:06,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:06,861 INFO L225 Difference]: With dead ends: 166 [2022-03-20 19:48:06,861 INFO L226 Difference]: Without dead ends: 155 [2022-03-20 19:48:06,861 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 88 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 19:48:06,862 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 19 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:06,862 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 377 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 617 Invalid, 0 Unknown, 18 Unchecked, 3.2s Time] [2022-03-20 19:48:06,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-03-20 19:48:06,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 146. [2022-03-20 19:48:06,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 109 states have (on average 1.091743119266055) internal successors, (119), 112 states have internal predecessors, (119), 21 states have call successors, (21), 16 states have call predecessors, (21), 15 states have return successors, (20), 17 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-20 19:48:06,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 160 transitions. [2022-03-20 19:48:06,920 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 160 transitions. Word has length 59 [2022-03-20 19:48:06,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:06,920 INFO L478 AbstractCegarLoop]: Abstraction has 146 states and 160 transitions. [2022-03-20 19:48:06,920 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:06,920 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 160 transitions. [2022-03-20 19:48:06,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:48:06,921 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:06,921 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:06,947 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:07,144 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 19:48:07,144 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:07,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:07,144 INFO L85 PathProgramCache]: Analyzing trace with hash 340607255, now seen corresponding path program 25 times [2022-03-20 19:48:07,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:07,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [5296446] [2022-03-20 19:48:07,145 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:07,145 INFO L85 PathProgramCache]: Analyzing trace with hash 340607255, now seen corresponding path program 26 times [2022-03-20 19:48:07,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:07,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741774655] [2022-03-20 19:48:07,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:07,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:07,151 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:07,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [144476302] [2022-03-20 19:48:07,151 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:48:07,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:07,151 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:07,154 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:07,156 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 19:48:07,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:48:07,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:07,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 19:48:07,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:08,069 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:08,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:09,277 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:09,277 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:09,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741774655] [2022-03-20 19:48:09,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:09,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144476302] [2022-03-20 19:48:09,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144476302] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:09,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:09,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2022-03-20 19:48:09,278 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:09,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [5296446] [2022-03-20 19:48:09,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [5296446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:09,278 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:09,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:48:09,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915160903] [2022-03-20 19:48:09,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:09,278 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:48:09,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:09,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:48:09,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:48:09,279 INFO L87 Difference]: Start difference. First operand 146 states and 160 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:09,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:09,954 INFO L93 Difference]: Finished difference Result 157 states and 172 transitions. [2022-03-20 19:48:09,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:48:09,955 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:48:09,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:09,956 INFO L225 Difference]: With dead ends: 157 [2022-03-20 19:48:09,956 INFO L226 Difference]: Without dead ends: 155 [2022-03-20 19:48:09,956 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:48:09,957 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:09,957 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 326 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 19:48:09,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-03-20 19:48:10,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 153. [2022-03-20 19:48:10,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 114 states have (on average 1.087719298245614) internal successors, (124), 118 states have internal predecessors, (124), 22 states have call successors, (22), 17 states have call predecessors, (22), 16 states have return successors, (21), 17 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 19:48:10,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 167 transitions. [2022-03-20 19:48:10,005 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 167 transitions. Word has length 59 [2022-03-20 19:48:10,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:10,005 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 167 transitions. [2022-03-20 19:48:10,006 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:10,006 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 167 transitions. [2022-03-20 19:48:10,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:48:10,006 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:10,007 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:10,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:10,212 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-20 19:48:10,212 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:10,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:10,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1502224219, now seen corresponding path program 27 times [2022-03-20 19:48:10,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:10,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [486349027] [2022-03-20 19:48:10,213 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:10,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1502224219, now seen corresponding path program 28 times [2022-03-20 19:48:10,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:10,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224348615] [2022-03-20 19:48:10,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:10,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:10,219 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:10,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [530274247] [2022-03-20 19:48:10,223 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:48:10,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:10,223 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:10,224 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:10,226 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 19:48:10,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:48:10,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:10,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 19:48:10,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:11,169 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:11,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:12,347 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 29 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:12,347 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:12,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224348615] [2022-03-20 19:48:12,347 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:12,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530274247] [2022-03-20 19:48:12,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530274247] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:12,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:12,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 25 [2022-03-20 19:48:12,348 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:12,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [486349027] [2022-03-20 19:48:12,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [486349027] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:12,348 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:12,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:48:12,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678549209] [2022-03-20 19:48:12,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:12,348 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:48:12,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:12,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:48:12,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2022-03-20 19:48:12,349 INFO L87 Difference]: Start difference. First operand 153 states and 167 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:13,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:13,102 INFO L93 Difference]: Finished difference Result 178 states and 196 transitions. [2022-03-20 19:48:13,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:48:13,103 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:48:13,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:13,104 INFO L225 Difference]: With dead ends: 178 [2022-03-20 19:48:13,104 INFO L226 Difference]: Without dead ends: 167 [2022-03-20 19:48:13,104 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=136, Invalid=566, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:48:13,105 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:13,105 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 350 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:48:13,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-03-20 19:48:13,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 165. [2022-03-20 19:48:13,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 123 states have (on average 1.08130081300813) internal successors, (133), 128 states have internal predecessors, (133), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 18 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 19:48:13,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 180 transitions. [2022-03-20 19:48:13,151 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 180 transitions. Word has length 59 [2022-03-20 19:48:13,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:13,151 INFO L478 AbstractCegarLoop]: Abstraction has 165 states and 180 transitions. [2022-03-20 19:48:13,151 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:13,151 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 180 transitions. [2022-03-20 19:48:13,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:48:13,152 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:13,152 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:13,158 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:13,352 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:13,353 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:13,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:13,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1293851497, now seen corresponding path program 29 times [2022-03-20 19:48:13,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:13,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [681559891] [2022-03-20 19:48:13,353 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:13,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1293851497, now seen corresponding path program 30 times [2022-03-20 19:48:13,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:13,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674424859] [2022-03-20 19:48:13,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:13,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:13,359 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:13,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1531121317] [2022-03-20 19:48:13,359 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:48:13,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:13,359 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:13,360 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:13,387 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 19:48:13,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 19:48:13,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:13,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-20 19:48:13,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:14,175 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:14,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:15,202 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:15,202 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:15,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674424859] [2022-03-20 19:48:15,202 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:15,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531121317] [2022-03-20 19:48:15,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531121317] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:15,202 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:15,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-20 19:48:15,203 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:15,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [681559891] [2022-03-20 19:48:15,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [681559891] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:15,203 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:15,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:48:15,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056112100] [2022-03-20 19:48:15,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:15,203 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:48:15,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:15,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:48:15,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:48:15,204 INFO L87 Difference]: Start difference. First operand 165 states and 180 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:15,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:15,910 INFO L93 Difference]: Finished difference Result 187 states and 206 transitions. [2022-03-20 19:48:15,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:48:15,911 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:48:15,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:15,912 INFO L225 Difference]: With dead ends: 187 [2022-03-20 19:48:15,912 INFO L226 Difference]: Without dead ends: 176 [2022-03-20 19:48:15,912 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:48:15,913 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 8 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:15,913 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 326 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:48:15,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-20 19:48:15,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 167. [2022-03-20 19:48:15,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 125 states have (on average 1.088) internal successors, (136), 129 states have internal predecessors, (136), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 19:48:15,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 183 transitions. [2022-03-20 19:48:15,968 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 183 transitions. Word has length 59 [2022-03-20 19:48:15,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:15,968 INFO L478 AbstractCegarLoop]: Abstraction has 167 states and 183 transitions. [2022-03-20 19:48:15,968 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:15,968 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 183 transitions. [2022-03-20 19:48:15,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 19:48:15,969 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:15,969 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:15,985 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:16,170 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-20 19:48:16,170 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:16,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:16,171 INFO L85 PathProgramCache]: Analyzing trace with hash 481155865, now seen corresponding path program 7 times [2022-03-20 19:48:16,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:16,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [678215370] [2022-03-20 19:48:16,171 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:16,171 INFO L85 PathProgramCache]: Analyzing trace with hash 481155865, now seen corresponding path program 8 times [2022-03-20 19:48:16,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:16,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875561694] [2022-03-20 19:48:16,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:16,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:16,182 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:16,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1029158416] [2022-03-20 19:48:16,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:48:16,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:16,183 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:16,184 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:16,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 19:48:16,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:48:16,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:16,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 19:48:16,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:16,991 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:16,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:18,064 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 19:48:18,064 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:18,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875561694] [2022-03-20 19:48:18,064 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:18,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029158416] [2022-03-20 19:48:18,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029158416] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:18,064 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:18,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2022-03-20 19:48:18,065 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:18,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [678215370] [2022-03-20 19:48:18,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [678215370] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:18,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:18,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:48:18,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270501549] [2022-03-20 19:48:18,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:18,065 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:48:18,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:18,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:48:18,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:48:18,066 INFO L87 Difference]: Start difference. First operand 167 states and 183 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:18,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:18,808 INFO L93 Difference]: Finished difference Result 178 states and 195 transitions. [2022-03-20 19:48:18,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:48:18,808 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2022-03-20 19:48:18,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:18,809 INFO L225 Difference]: With dead ends: 178 [2022-03-20 19:48:18,809 INFO L226 Difference]: Without dead ends: 176 [2022-03-20 19:48:18,810 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=127, Invalid=629, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:48:18,810 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:18,810 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 350 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:48:18,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-20 19:48:18,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 167. [2022-03-20 19:48:18,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 125 states have (on average 1.088) internal successors, (136), 129 states have internal predecessors, (136), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 19:48:18,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 183 transitions. [2022-03-20 19:48:18,863 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 183 transitions. Word has length 59 [2022-03-20 19:48:18,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:18,863 INFO L478 AbstractCegarLoop]: Abstraction has 167 states and 183 transitions. [2022-03-20 19:48:18,863 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 19:48:18,864 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 183 transitions. [2022-03-20 19:48:18,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 19:48:18,864 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:18,864 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:18,886 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:19,079 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:19,079 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:19,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:19,080 INFO L85 PathProgramCache]: Analyzing trace with hash 1744740017, now seen corresponding path program 9 times [2022-03-20 19:48:19,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:19,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1434212231] [2022-03-20 19:48:19,080 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:19,080 INFO L85 PathProgramCache]: Analyzing trace with hash 1744740017, now seen corresponding path program 10 times [2022-03-20 19:48:19,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:19,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410198269] [2022-03-20 19:48:19,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:19,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:19,086 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:19,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [174208119] [2022-03-20 19:48:19,086 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:48:19,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:19,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:19,088 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:19,089 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 19:48:19,130 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:48:19,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:19,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 58 conjunts are in the unsatisfiable core [2022-03-20 19:48:19,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 19:48:20,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:21,218 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-03-20 19:48:21,218 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:21,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410198269] [2022-03-20 19:48:21,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:21,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174208119] [2022-03-20 19:48:21,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174208119] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:21,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:21,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 26 [2022-03-20 19:48:21,219 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:21,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1434212231] [2022-03-20 19:48:21,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1434212231] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:21,219 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:21,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 19:48:21,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097808589] [2022-03-20 19:48:21,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:21,220 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 19:48:21,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:21,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 19:48:21,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:48:21,220 INFO L87 Difference]: Start difference. First operand 167 states and 183 transitions. Second operand has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:22,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:22,858 INFO L93 Difference]: Finished difference Result 192 states and 212 transitions. [2022-03-20 19:48:22,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 19:48:22,859 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-20 19:48:22,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:22,861 INFO L225 Difference]: With dead ends: 192 [2022-03-20 19:48:22,861 INFO L226 Difference]: Without dead ends: 190 [2022-03-20 19:48:22,861 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 105 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2022-03-20 19:48:22,861 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:22,862 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 404 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 19:48:22,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-03-20 19:48:22,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 188. [2022-03-20 19:48:22,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 141 states have (on average 1.0921985815602837) internal successors, (154), 146 states have internal predecessors, (154), 27 states have call successors, (27), 20 states have call predecessors, (27), 19 states have return successors, (26), 21 states have call predecessors, (26), 26 states have call successors, (26) [2022-03-20 19:48:22,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 207 transitions. [2022-03-20 19:48:22,943 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 207 transitions. Word has length 68 [2022-03-20 19:48:22,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:22,943 INFO L478 AbstractCegarLoop]: Abstraction has 188 states and 207 transitions. [2022-03-20 19:48:22,943 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.235294117647059) internal successors, (38), 20 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:22,943 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 207 transitions. [2022-03-20 19:48:22,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 19:48:22,944 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:22,944 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:22,968 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:23,163 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:23,163 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:23,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:23,164 INFO L85 PathProgramCache]: Analyzing trace with hash -775219917, now seen corresponding path program 31 times [2022-03-20 19:48:23,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:23,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1308680249] [2022-03-20 19:48:23,164 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:23,164 INFO L85 PathProgramCache]: Analyzing trace with hash -775219917, now seen corresponding path program 32 times [2022-03-20 19:48:23,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:23,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893886639] [2022-03-20 19:48:23,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:23,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:23,169 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:23,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [406486626] [2022-03-20 19:48:23,169 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:48:23,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:23,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:23,171 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:23,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 19:48:23,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:48:23,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:23,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 75 conjunts are in the unsatisfiable core [2022-03-20 19:48:23,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:25,038 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-03-20 19:48:25,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:26,082 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 19:48:26,082 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:26,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893886639] [2022-03-20 19:48:26,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:26,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406486626] [2022-03-20 19:48:26,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406486626] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:26,082 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:26,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12] total 30 [2022-03-20 19:48:26,082 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:26,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1308680249] [2022-03-20 19:48:26,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1308680249] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:26,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:26,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 19:48:26,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302192187] [2022-03-20 19:48:26,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:26,083 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 19:48:26,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:26,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 19:48:26,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2022-03-20 19:48:26,084 INFO L87 Difference]: Start difference. First operand 188 states and 207 transitions. Second operand has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:27,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:27,706 INFO L93 Difference]: Finished difference Result 203 states and 221 transitions. [2022-03-20 19:48:27,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 19:48:27,707 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-20 19:48:27,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:27,708 INFO L225 Difference]: With dead ends: 203 [2022-03-20 19:48:27,708 INFO L226 Difference]: Without dead ends: 201 [2022-03-20 19:48:27,708 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 19:48:27,709 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 22 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:27,709 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 388 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 19:48:27,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-03-20 19:48:27,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 176. [2022-03-20 19:48:27,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 132 states have (on average 1.0909090909090908) internal successors, (144), 136 states have internal predecessors, (144), 25 states have call successors, (25), 19 states have call predecessors, (25), 18 states have return successors, (24), 20 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-20 19:48:27,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 193 transitions. [2022-03-20 19:48:27,763 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 193 transitions. Word has length 68 [2022-03-20 19:48:27,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:27,763 INFO L478 AbstractCegarLoop]: Abstraction has 176 states and 193 transitions. [2022-03-20 19:48:27,763 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 18 states have (on average 2.111111111111111) internal successors, (38), 22 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:27,763 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 193 transitions. [2022-03-20 19:48:27,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 19:48:27,764 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:27,764 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:27,783 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 19:48:27,971 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-03-20 19:48:27,971 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:27,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:27,971 INFO L85 PathProgramCache]: Analyzing trace with hash 723671663, now seen corresponding path program 33 times [2022-03-20 19:48:27,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:27,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [335636427] [2022-03-20 19:48:27,972 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:27,972 INFO L85 PathProgramCache]: Analyzing trace with hash 723671663, now seen corresponding path program 34 times [2022-03-20 19:48:27,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:27,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105573189] [2022-03-20 19:48:27,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:27,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:27,977 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:27,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1087564639] [2022-03-20 19:48:27,977 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 19:48:27,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:27,978 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:27,979 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:27,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 19:48:28,027 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 19:48:28,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:28,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-20 19:48:28,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:29,688 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:48:30,211 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-03-20 19:48:30,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:31,196 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 19:48:31,196 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:31,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105573189] [2022-03-20 19:48:31,197 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:31,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087564639] [2022-03-20 19:48:31,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087564639] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:31,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:31,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 25 [2022-03-20 19:48:31,197 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:31,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [335636427] [2022-03-20 19:48:31,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [335636427] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:31,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:31,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 19:48:31,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076643052] [2022-03-20 19:48:31,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:31,197 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 19:48:31,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:31,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 19:48:31,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2022-03-20 19:48:31,198 INFO L87 Difference]: Start difference. First operand 176 states and 193 transitions. Second operand has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:33,303 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:48:35,790 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 19:48:37,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:48:37,550 INFO L93 Difference]: Finished difference Result 196 states and 214 transitions. [2022-03-20 19:48:37,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 19:48:37,551 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 68 [2022-03-20 19:48:37,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:48:37,552 INFO L225 Difference]: With dead ends: 196 [2022-03-20 19:48:37,552 INFO L226 Difference]: Without dead ends: 194 [2022-03-20 19:48:37,552 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 107 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-03-20 19:48:37,552 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:48:37,553 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 379 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 649 Invalid, 2 Unknown, 0 Unchecked, 5.6s Time] [2022-03-20 19:48:37,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-03-20 19:48:37,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 183. [2022-03-20 19:48:37,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 137 states have (on average 1.0875912408759123) internal successors, (149), 142 states have internal predecessors, (149), 26 states have call successors, (26), 20 states have call predecessors, (26), 19 states have return successors, (25), 20 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 19:48:37,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 200 transitions. [2022-03-20 19:48:37,631 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 200 transitions. Word has length 68 [2022-03-20 19:48:37,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:48:37,631 INFO L478 AbstractCegarLoop]: Abstraction has 183 states and 200 transitions. [2022-03-20 19:48:37,631 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 19 states have internal predecessors, (38), 7 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 19:48:37,631 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 200 transitions. [2022-03-20 19:48:37,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 19:48:37,632 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:48:37,632 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:48:37,649 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-03-20 19:48:37,832 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-20 19:48:37,833 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:48:37,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:48:37,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1885288627, now seen corresponding path program 35 times [2022-03-20 19:48:37,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:37,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [242411170] [2022-03-20 19:48:37,833 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:48:37,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1885288627, now seen corresponding path program 36 times [2022-03-20 19:48:37,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:48:37,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344523122] [2022-03-20 19:48:37,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:48:37,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:48:37,839 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 19:48:37,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [764050845] [2022-03-20 19:48:37,840 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 19:48:37,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:48:37,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:48:37,842 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:48:37,843 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 19:48:37,896 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 19:48:37,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:48:37,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 19:48:37,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:48:38,111 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:48:38,113 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:48:38,116 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 19:48:40,996 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 19:48:40,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:48:41,393 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 46 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 19:48:41,394 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:48:41,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344523122] [2022-03-20 19:48:41,394 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 19:48:41,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764050845] [2022-03-20 19:48:41,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764050845] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:48:41,394 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 19:48:41,394 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2022-03-20 19:48:41,394 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:48:41,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [242411170] [2022-03-20 19:48:41,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [242411170] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:48:41,395 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:48:41,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 19:48:41,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629212119] [2022-03-20 19:48:41,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:48:41,395 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 19:48:41,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:48:41,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 19:48:41,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=126, Unknown=1, NotChecked=0, Total=156 [2022-03-20 19:48:41,395 INFO L87 Difference]: Start difference. First operand 183 states and 200 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 19:49:12,153 WARN L232 SmtUtils]: Spent 30.59s on a formula simplification. DAG size of input: 69 DAG size of output: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 19:49:12,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:49:12,364 INFO L93 Difference]: Finished difference Result 183 states and 200 transitions. [2022-03-20 19:49:12,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 19:49:12,365 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2022-03-20 19:49:12,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:49:12,366 INFO L225 Difference]: With dead ends: 183 [2022-03-20 19:49:12,366 INFO L226 Difference]: Without dead ends: 0 [2022-03-20 19:49:12,367 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 121 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=43, Invalid=166, Unknown=1, NotChecked=0, Total=210 [2022-03-20 19:49:12,367 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 8 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:49:12,367 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 134 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 12 Unchecked, 0.2s Time] [2022-03-20 19:49:12,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-20 19:49:12,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-20 19:49:12,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-20 19:49:12,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-20 19:49:12,368 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2022-03-20 19:49:12,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:49:12,368 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-20 19:49:12,368 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 19:49:12,368 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-20 19:49:12,368 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-20 19:49:12,370 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 19:49:12,387 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-20 19:49:12,571 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-20 19:49:12,572 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-20 19:53:53,892 WARN L232 SmtUtils]: Spent 4.68m on a formula simplification. DAG size of input: 427 DAG size of output: 390 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2022-03-20 19:54:12,067 WARN L232 SmtUtils]: Spent 6.92s on a formula simplification. DAG size of input: 322 DAG size of output: 33 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-20 19:55:49,092 WARN L232 SmtUtils]: Spent 1.62m on a formula simplification. DAG size of input: 357 DAG size of output: 49 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-20 19:56:24,746 WARN L232 SmtUtils]: Spent 35.51s on a formula simplification. DAG size of input: 320 DAG size of output: 30 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-20 19:56:31,872 WARN L232 SmtUtils]: Spent 7.12s on a formula simplification. DAG size of input: 173 DAG size of output: 92 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter) [2022-03-20 19:56:31,960 INFO L882 garLoopResultBuilder]: For program point reach_errorEXIT(line 7) no Hoare annotation was computed. [2022-03-20 19:56:31,960 INFO L882 garLoopResultBuilder]: For program point reach_errorENTRY(line 7) no Hoare annotation was computed. [2022-03-20 19:56:31,960 INFO L882 garLoopResultBuilder]: For program point reach_errorFINAL(line 7) no Hoare annotation was computed. [2022-03-20 19:56:31,960 INFO L885 garLoopResultBuilder]: At program point assume_abort_if_notENTRY(lines 10 12) the Hoare annotation is: true [2022-03-20 19:56:31,960 INFO L878 garLoopResultBuilder]: At program point L11(line 11) the Hoare annotation is: (= assume_abort_if_not_~cond |assume_abort_if_not_#in~cond|) [2022-03-20 19:56:31,960 INFO L878 garLoopResultBuilder]: At program point L11-2(lines 10 12) the Hoare annotation is: (and (not (= |assume_abort_if_not_#in~cond| 0)) (= assume_abort_if_not_~cond |assume_abort_if_not_#in~cond|)) [2022-03-20 19:56:31,960 INFO L878 garLoopResultBuilder]: At program point assume_abort_if_notEXIT(lines 10 12) the Hoare annotation is: (and (not (= |assume_abort_if_not_#in~cond| 0)) (= assume_abort_if_not_~cond |assume_abort_if_not_#in~cond|)) [2022-03-20 19:56:31,960 INFO L878 garLoopResultBuilder]: At program point L27(line 27) the Hoare annotation is: (and (<= main_~X~0 20) (<= 0 main_~X~0)) [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L27-1(line 27) the Hoare annotation is: (and (<= main_~X~0 20) (<= 0 main_~Y~0) (<= main_~Y~0 20) (<= 0 main_~X~0)) [2022-03-20 19:56:31,961 INFO L885 garLoopResultBuilder]: At program point L25(line 25) the Hoare annotation is: true [2022-03-20 19:56:31,961 INFO L885 garLoopResultBuilder]: At program point mainEXIT(lines 21 53) the Hoare annotation is: true [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L25-1(line 25) the Hoare annotation is: (and (<= main_~X~0 20) (<= 0 main_~X~0)) [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L50(line 50) the Hoare annotation is: (let ((.cse3 (+ main_~X~0 main_~v~0)) (.cse16 (* main_~X~0 main_~y~0))) (let ((.cse8 (* .cse16 2)) (.cse4 (* main_~Y~0 4)) (.cse7 (* 2 (* main_~Y~0 main_~x~0))) (.cse10 (* (- 1) main_~Y~0)) (.cse9 (div .cse3 2)) (.cse1 (<= 0 main_~Y~0)) (.cse2 (<= main_~Y~0 20)) (.cse0 (= main_~xy~0 0)) (.cse6 (* main_~Y~0 2)) (.cse5 (= main_~y~0 0)) (.cse18 (= main_~yx~0 0))) (or (and .cse0 (= main_~x~0 1) .cse1 .cse2 (= .cse3 .cse4) (= main_~Y~0 main_~yx~0) .cse5) (and (= .cse3 (* main_~Y~0 8)) .cse0 (= (+ .cse6 .cse7) (+ .cse8 main_~X~0 main_~v~0)) .cse1 .cse2 .cse5 (= main_~yx~0 (* (div (+ .cse9 .cse10) main_~Y~0) main_~Y~0))) (and (= (* main_~Y~0 (div .cse6 main_~Y~0)) main_~yx~0) .cse0 (= (+ .cse8 .cse4) .cse7) .cse1 .cse2 .cse5 (= .cse3 (* main_~Y~0 6))) (let ((.cse13 (+ main_~X~0 1))) (and (let ((.cse14 (= (mod (+ (* main_~X~0 main_~y~0 2) main_~X~0 main_~v~0) 2) 0)) (.cse15 (= main_~Y~0 0))) (or (let ((.cse12 (+ .cse16 .cse9 .cse10))) (let ((.cse11 (div .cse12 main_~Y~0))) (and (= (* main_~y~0 .cse11) main_~xy~0) (= (mod .cse12 main_~Y~0) 0) (<= .cse11 .cse13) .cse14 (not (<= .cse11 main_~X~0)) (not .cse15) (= main_~yx~0 (* main_~Y~0 .cse11))))) (let ((.cse17 (div main_~xy~0 main_~y~0))) (and (= (mod main_~xy~0 main_~y~0) 0) (not .cse5) .cse14 (= (+ .cse16 .cse9) main_~Y~0) (<= .cse17 .cse13) (< main_~X~0 .cse17) .cse18 .cse15)))) (<= main_~X~0 20) .cse1 .cse2 (<= 0 main_~X~0) (not (<= main_~x~0 main_~X~0)) (<= main_~x~0 .cse13))) (and (= main_~x~0 0) .cse0 (= .cse3 .cse6) .cse5 .cse18)))) [2022-03-20 19:56:31,961 INFO L885 garLoopResultBuilder]: At program point L50-1(line 50) the Hoare annotation is: true [2022-03-20 19:56:31,961 INFO L885 garLoopResultBuilder]: At program point mainFINAL(lines 21 53) the Hoare annotation is: true [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L40(lines 40 45) the Hoare annotation is: (let ((.cse0 (<= main_~X~0 20)) (.cse3 (* main_~Y~0 2)) (.cse1 (<= 0 main_~Y~0)) (.cse2 (<= main_~Y~0 20))) (or (and (= main_~x~0 0) .cse0 .cse1 .cse2 (<= 0 main_~X~0) (= (+ main_~X~0 main_~v~0) .cse3) (= main_~y~0 0)) (let ((.cse5 (* main_~X~0 main_~y~0)) (.cse4 (* main_~Y~0 main_~x~0))) (and (<= main_~x~0 main_~X~0) .cse0 (<= 0 main_~x~0) (= (+ .cse3 (* 2 .cse4)) (+ (* .cse5 2) main_~X~0 main_~v~0)) .cse1 .cse2 (= .cse5 main_~xy~0) (= main_~yx~0 .cse4))))) [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L40-2(lines 40 45) the Hoare annotation is: (and (<= main_~x~0 main_~X~0) (<= main_~X~0 20) (<= 0 main_~x~0) (<= 0 main_~Y~0) (<= main_~Y~0 20) (= (+ (* main_~Y~0 4) (* 2 (* main_~Y~0 main_~x~0))) (+ (* (* main_~X~0 main_~y~0) 2) main_~X~0 main_~v~0))) [2022-03-20 19:56:31,961 INFO L878 garLoopResultBuilder]: At program point L32-2(lines 32 47) the Hoare annotation is: (and (<= main_~X~0 20) (<= 0 main_~x~0) (= (+ (* main_~Y~0 2) (* 2 (* main_~Y~0 main_~x~0))) (+ (* (* main_~X~0 main_~y~0) 2) main_~X~0 main_~v~0)) (<= 0 main_~Y~0) (<= main_~Y~0 20) (<= 0 main_~X~0) (<= main_~x~0 (+ main_~X~0 1))) [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point mainENTRY(lines 21 53) the Hoare annotation is: true [2022-03-20 19:56:31,962 INFO L878 garLoopResultBuilder]: At program point L32-3(lines 32 47) the Hoare annotation is: (let ((.cse8 (* main_~X~0 main_~y~0)) (.cse10 (* main_~Y~0 main_~x~0))) (let ((.cse11 (* main_~Y~0 2)) (.cse13 (* 2 .cse10)) (.cse12 (* .cse8 2))) (let ((.cse7 (= (+ .cse11 .cse13) (+ .cse12 main_~X~0 main_~v~0))) (.cse1 (<= 0 main_~Y~0)) (.cse2 (<= main_~Y~0 20)) (.cse4 (* main_~Y~0 4)) (.cse6 (* main_~Y~0 8)) (.cse14 (* main_~Y~0 6)) (.cse9 (not (<= main_~x~0 main_~X~0))) (.cse0 (= main_~xy~0 0)) (.cse3 (+ main_~X~0 main_~v~0)) (.cse5 (= main_~y~0 0))) (or (and .cse0 (= main_~x~0 1) .cse1 .cse2 (= .cse3 .cse4) (= main_~Y~0 main_~yx~0) .cse5) (and (= .cse3 .cse6) .cse0 .cse7 .cse1 .cse2 .cse5 (= main_~yx~0 (* (div (+ (div .cse3 2) (* (- 1) main_~Y~0)) main_~Y~0) main_~Y~0))) (and (<= main_~X~0 20) .cse7 .cse1 .cse2 (<= 0 main_~X~0) (= .cse8 main_~xy~0) .cse9 (= main_~yx~0 .cse10) (<= main_~x~0 (+ main_~X~0 1))) (and (= (* main_~Y~0 (div .cse11 main_~Y~0)) main_~yx~0) .cse0 (= (+ .cse12 .cse4) .cse13) .cse1 .cse2 .cse5 (= .cse3 .cse14)) (let ((.cse15 (* main_~X~0 3))) (and (< .cse4 .cse15) (= main_~y~0 2) (= main_~x~0 3) (= .cse6 (+ main_~v~0 (* 5 main_~X~0))) (<= .cse15 .cse14) .cse9)) (and (= main_~x~0 0) .cse0 (= .cse3 .cse11) .cse5 (= main_~yx~0 0)))))) [2022-03-20 19:56:31,962 INFO L878 garLoopResultBuilder]: At program point L35(line 35) the Hoare annotation is: (and (let ((.cse1 (div main_~yx~0 main_~Y~0))) (let ((.cse0 (* .cse1 main_~Y~0))) (or (and (= (+ .cse0 (div (+ main_~X~0 main_~v~0) (- 2)) main_~Y~0) 0) (= main_~X~0 0) (= (mod (+ (* .cse1 (- 2) main_~Y~0) main_~X~0 main_~v~0) 2) 0)) (and (= (+ main_~X~0 main_~v~0 (* (* (div main_~xy~0 main_~X~0) main_~X~0) 2)) (+ (* .cse0 2) (* main_~Y~0 2))) (= (mod main_~xy~0 main_~X~0) 0))))) (<= main_~X~0 20) (<= 0 main_~x~0) (<= 0 main_~Y~0) (<= main_~Y~0 20) (<= 0 main_~X~0) (= (* main_~X~0 main_~y~0) main_~xy~0) (= main_~yx~0 (* main_~Y~0 main_~x~0)) (<= main_~x~0 (+ main_~X~0 1))) [2022-03-20 19:56:31,962 INFO L878 garLoopResultBuilder]: At program point L35-1(lines 32 47) the Hoare annotation is: (let ((.cse1 (* main_~X~0 main_~y~0)) (.cse0 (* main_~Y~0 main_~x~0))) (and (<= main_~X~0 20) (<= 0 main_~x~0) (= (+ (* main_~Y~0 2) (* 2 .cse0)) (+ (* .cse1 2) main_~X~0 main_~v~0)) (<= 0 main_~Y~0) (<= main_~Y~0 20) (<= 0 main_~X~0) (= .cse1 main_~xy~0) (= main_~yx~0 .cse0) (<= main_~x~0 (+ main_~X~0 1)))) [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,962 INFO L878 garLoopResultBuilder]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#NULL.base)| |#NULL.base|)) [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point L-1(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,962 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,963 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2022-03-20 19:56:31,963 INFO L878 garLoopResultBuilder]: At program point L15(lines 15 16) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2022-03-20 19:56:31,963 INFO L885 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 13 19) the Hoare annotation is: true [2022-03-20 19:56:31,963 INFO L878 garLoopResultBuilder]: At program point L14(lines 14 17) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (not (<= 1 |__VERIFIER_assert_#in~cond|))) [2022-03-20 19:56:31,963 INFO L878 garLoopResultBuilder]: At program point L14-2(lines 13 19) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (not (<= 1 |__VERIFIER_assert_#in~cond|))) [2022-03-20 19:56:31,963 INFO L878 garLoopResultBuilder]: At program point __VERIFIER_assertEXIT(lines 13 19) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (not (<= 1 |__VERIFIER_assert_#in~cond|))) [2022-03-20 19:56:31,963 INFO L878 garLoopResultBuilder]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2022-03-20 19:56:31,966 INFO L719 BasicCegarLoop]: Path program histogram: [36, 10, 8, 8, 6, 2, 2] [2022-03-20 19:56:31,967 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-20 19:56:31,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.03 07:56:31 BoogieIcfgContainer [2022-03-20 19:56:31,979 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-20 19:56:31,979 INFO L158 Benchmark]: Toolchain (without parser) took 775376.58ms. Allocated memory was 176.2MB in the beginning and 255.9MB in the end (delta: 79.7MB). Free memory was 125.4MB in the beginning and 93.4MB in the end (delta: 32.0MB). Peak memory consumption was 129.5MB. Max. memory is 8.0GB. [2022-03-20 19:56:31,980 INFO L158 Benchmark]: CDTParser took 0.15ms. Allocated memory is still 176.2MB. Free memory was 141.7MB in the beginning and 141.5MB in the end (delta: 136.5kB). There was no memory consumed. Max. memory is 8.0GB. [2022-03-20 19:56:31,980 INFO L158 Benchmark]: CACSL2BoogieTranslator took 224.60ms. Allocated memory is still 176.2MB. Free memory was 125.2MB in the beginning and 151.3MB in the end (delta: -26.1MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-20 19:56:31,980 INFO L158 Benchmark]: Boogie Preprocessor took 23.79ms. Allocated memory is still 176.2MB. Free memory was 151.3MB in the beginning and 149.9MB in the end (delta: 1.4MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-03-20 19:56:31,980 INFO L158 Benchmark]: RCFGBuilder took 279.50ms. Allocated memory is still 176.2MB. Free memory was 149.9MB in the beginning and 139.1MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-03-20 19:56:31,980 INFO L158 Benchmark]: TraceAbstraction took 774840.96ms. Allocated memory was 176.2MB in the beginning and 255.9MB in the end (delta: 79.7MB). Free memory was 138.7MB in the beginning and 93.4MB in the end (delta: 45.4MB). Peak memory consumption was 142.2MB. Max. memory is 8.0GB. [2022-03-20 19:56:31,981 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15ms. Allocated memory is still 176.2MB. Free memory was 141.7MB in the beginning and 141.5MB in the end (delta: 136.5kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 224.60ms. Allocated memory is still 176.2MB. Free memory was 125.2MB in the beginning and 151.3MB in the end (delta: -26.1MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 23.79ms. Allocated memory is still 176.2MB. Free memory was 151.3MB in the beginning and 149.9MB in the end (delta: 1.4MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 279.50ms. Allocated memory is still 176.2MB. Free memory was 149.9MB in the beginning and 139.1MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 774840.96ms. Allocated memory was 176.2MB in the beginning and 255.9MB in the end (delta: 79.7MB). Free memory was 138.7MB in the beginning and 93.4MB in the end (delta: 45.4MB). Peak memory consumption was 142.2MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 16]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 774.8s, OverallIterations: 36, TraceHistogramMax: 6, PathProgramHistogramMax: 36, EmptinessCheckTime: 0.0s, AutomataDifference: 129.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 439.4s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 16 mSolverCounterUnknown, 605 SdHoareTripleChecker+Valid, 58.9s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 563 mSDsluCounter, 9239 SdHoareTripleChecker+Invalid, 57.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 83 IncrementalHoareTripleChecker+Unchecked, 8267 mSDsCounter, 205 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 12377 IncrementalHoareTripleChecker+Invalid, 12681 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 205 mSolverCounterUnsat, 972 mSDtfsCounter, 12377 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 3737 GetRequests, 2865 SyntacticMatches, 76 SemanticMatches, 796 ConstructedPredicates, 2 IntricatePredicates, 1 DeprecatedPredicates, 3056 ImplicationChecksByTransitivity, 127.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=188occurred in iteration=33, InterpolantAutomatonStates: 527, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.2s AutomataMinimizationTime, 36 MinimizatonAttempts, 228 StatesRemovedByMinimization, 32 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 32 LocationsWithAnnotation, 304 PreInvPairs, 553 NumberOfFragments, 930 HoareAnnotationTreeSize, 304 FomulaSimplifications, 1458946 FormulaSimplificationTreeSizeReduction, 285.4s HoareSimplificationTime, 32 FomulaSimplificationsInter, 8767222 FormulaSimplificationTreeSizeReductionInter, 154.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 32]: Loop Invariant Derived loop invariant: (((((X <= 20 && 0 <= x) && Y * 2 + 2 * (Y * x) == X * y * 2 + X + v) && 0 <= Y) && Y <= 20) && 0 <= X) && x <= X + 1 - ProcedureContractResult [Line: 10]: Procedure Contract for assume_abort_if_not Derived contract for procedure assume_abort_if_not: !(\old(cond) == 0) && cond == \old(cond) - ProcedureContractResult [Line: 21]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 13]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: \old(cond) == cond || !(1 <= \old(cond)) RESULT: Ultimate proved your program to be correct! [2022-03-20 19:56:32,193 WARN L435 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2022-03-20 19:56:32,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request...