/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 15:22:56,348 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 15:22:56,367 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 15:22:56,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 15:22:56,411 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 15:22:56,416 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 15:22:56,416 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 15:22:56,417 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 15:22:56,417 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 15:22:56,418 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 15:22:56,418 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:22:56,419 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 15:22:56,419 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 15:22:56,419 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 15:22:56,595 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 15:22:56,615 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 15:22:56,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 15:22:56,617 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 15:22:56,618 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 15:22:56,619 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c [2022-04-06 15:22:56,663 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9eb43f75f/a6aede13e6b74998821d9ff96a44169f/FLAG81ccdf2bd [2022-04-06 15:22:56,985 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 15:22:56,985 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c [2022-04-06 15:22:56,989 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9eb43f75f/a6aede13e6b74998821d9ff96a44169f/FLAG81ccdf2bd [2022-04-06 15:22:56,997 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9eb43f75f/a6aede13e6b74998821d9ff96a44169f [2022-04-06 15:22:56,999 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 15:22:57,000 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 15:22:57,001 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 15:22:57,001 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 15:22:57,007 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 15:22:57,007 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:22:56" (1/1) ... [2022-04-06 15:22:57,008 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a63bc09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57, skipping insertion in model container [2022-04-06 15:22:57,008 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:22:56" (1/1) ... [2022-04-06 15:22:57,013 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 15:22:57,022 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 15:22:57,186 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_unwindbound10.c[597,610] [2022-04-06 15:22:57,208 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:22:57,213 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 15:22:57,222 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_unwindbound10.c[597,610] [2022-04-06 15:22:57,234 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:22:57,242 INFO L208 MainTranslator]: Completed translation [2022-04-06 15:22:57,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57 WrapperNode [2022-04-06 15:22:57,242 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 15:22:57,243 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 15:22:57,243 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 15:22:57,243 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 15:22:57,249 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,249 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,254 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,255 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,263 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,268 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,270 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 15:22:57,271 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 15:22:57,271 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 15:22:57,271 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 15:22:57,271 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (1/1) ... [2022-04-06 15:22:57,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:22:57,282 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:57,301 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) [2022-04-06 15:22:57,313 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 [2022-04-06 15:22:57,330 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 15:22:57,330 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 15:22:57,331 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 15:22:57,331 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 15:22:57,331 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 15:22:57,331 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 15:22:57,331 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 15:22:57,331 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 15:22:57,331 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 15:22:57,331 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 15:22:57,332 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 15:22:57,332 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 15:22:57,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 15:22:57,379 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 15:22:57,380 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 15:22:57,500 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 15:22:57,504 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 15:22:57,504 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 15:22:57,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:22:57 BoogieIcfgContainer [2022-04-06 15:22:57,505 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 15:22:57,506 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 15:22:57,506 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 15:22:57,508 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 15:22:57,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 03:22:56" (1/3) ... [2022-04-06 15:22:57,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@539fc4fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:22:57, skipping insertion in model container [2022-04-06 15:22:57,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:57" (2/3) ... [2022-04-06 15:22:57,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@539fc4fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:22:57, skipping insertion in model container [2022-04-06 15:22:57,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:22:57" (3/3) ... [2022-04-06 15:22:57,510 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_unwindbound10.c [2022-04-06 15:22:57,513 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 15:22:57,513 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 15:22:57,537 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 15:22:57,549 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 [2022-04-06 15:22:57,549 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 15:22:57,560 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:22:57,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 15:22:57,567 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:57,568 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:57,568 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:57,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:57,571 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 1 times [2022-04-06 15:22:57,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:57,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1931894199] [2022-04-06 15:22:57,588 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:22:57,589 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 2 times [2022-04-06 15:22:57,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:57,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480658327] [2022-04-06 15:22:57,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:57,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:57,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:22:57,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:22:57,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:22:57,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:57,694 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:57,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480658327] [2022-04-06 15:22:57,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480658327] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:57,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:57,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:22:57,696 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:57,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1931894199] [2022-04-06 15:22:57,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1931894199] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:57,697 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:57,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:22:57,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245570977] [2022-04-06 15:22:57,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:57,700 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 15:22:57,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:57,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 15:22:57,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:22:57,723 INFO L87 Difference]: Start difference. First operand has 25 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 15:22:57,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:57,760 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2022-04-06 15:22:57,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 15:22:57,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 15:22:57,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:57,766 INFO L225 Difference]: With dead ends: 45 [2022-04-06 15:22:57,766 INFO L226 Difference]: Without dead ends: 21 [2022-04-06 15:22:57,768 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:22:57,770 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:57,771 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 31 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:22:57,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-04-06 15:22:57,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-04-06 15:22:57,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:57,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-04-06 15:22:57,791 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 12 [2022-04-06 15:22:57,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:57,792 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-04-06 15:22:57,792 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 15:22:57,792 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-04-06 15:22:57,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 15:22:57,792 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:57,792 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:57,792 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 15:22:57,793 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:57,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:57,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 1 times [2022-04-06 15:22:57,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:57,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1651162528] [2022-04-06 15:22:57,794 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:22:57,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 2 times [2022-04-06 15:22:57,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:57,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292320271] [2022-04-06 15:22:57,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:57,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:57,805 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:57,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1297421800] [2022-04-06 15:22:57,807 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:57,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:57,808 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:57,827 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) [2022-04-06 15:22:57,861 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 15:22:57,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 15:22:57,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:57,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 15:22:57,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:58,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:58,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 15:22:58,030 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:58,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292320271] [2022-04-06 15:22:58,030 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:58,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297421800] [2022-04-06 15:22:58,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297421800] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:58,031 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:58,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 15:22:58,032 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:58,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1651162528] [2022-04-06 15:22:58,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1651162528] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:58,032 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:58,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 15:22:58,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779198320] [2022-04-06 15:22:58,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:58,036 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 15:22:58,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:58,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 15:22:58,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 15:22:58,041 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 15:22:58,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:58,135 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-04-06 15:22:58,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 15:22:58,136 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 15:22:58,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:58,137 INFO L225 Difference]: With dead ends: 34 [2022-04-06 15:22:58,137 INFO L226 Difference]: Without dead ends: 29 [2022-04-06 15:22:58,137 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 15:22:58,138 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:58,139 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 64 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:58,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-04-06 15:22:58,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-04-06 15:22:58,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:22:58,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-04-06 15:22:58,144 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 12 [2022-04-06 15:22:58,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:58,145 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-04-06 15:22:58,145 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 15:22:58,145 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-04-06 15:22:58,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-06 15:22:58,145 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:58,146 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:58,171 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-04-06 15:22:58,373 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 [2022-04-06 15:22:58,374 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:58,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:58,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 1 times [2022-04-06 15:22:58,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:58,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [755631483] [2022-04-06 15:22:58,390 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:58,390 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:58,390 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:58,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 2 times [2022-04-06 15:22:58,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:58,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630912989] [2022-04-06 15:22:58,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:58,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:58,419 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:58,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [895146760] [2022-04-06 15:22:58,420 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:58,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:58,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:58,424 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) [2022-04-06 15:22:58,425 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 15:22:58,461 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:58,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:58,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 19 conjunts are in the unsatisfiable core [2022-04-06 15:22:58,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:58,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:58,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:58,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 15:22:58,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:58,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630912989] [2022-04-06 15:22:58,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:58,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895146760] [2022-04-06 15:22:58,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895146760] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:22:58,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:22:58,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-04-06 15:22:58,710 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:58,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [755631483] [2022-04-06 15:22:58,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [755631483] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:58,711 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:58,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 15:22:58,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838892340] [2022-04-06 15:22:58,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:58,711 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 15:22:58,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:58,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 15:22:58,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-04-06 15:22:58,712 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:58,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:58,787 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-04-06 15:22:58,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:22:58,788 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-04-06 15:22:58,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:58,789 INFO L225 Difference]: With dead ends: 44 [2022-04-06 15:22:58,789 INFO L226 Difference]: Without dead ends: 39 [2022-04-06 15:22:58,789 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-04-06 15:22:58,790 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:58,791 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 106 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:58,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-04-06 15:22:58,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-04-06 15:22:58,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 28 states have internal predecessors, (32), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:22:58,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-04-06 15:22:58,797 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 22 [2022-04-06 15:22:58,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:58,797 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-04-06 15:22:58,797 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:58,797 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-04-06 15:22:58,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-06 15:22:58,798 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:58,798 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:58,814 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-04-06 15:22:59,000 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 [2022-04-06 15:22:59,000 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:59,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:59,001 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 1 times [2022-04-06 15:22:59,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:59,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [16401467] [2022-04-06 15:22:59,013 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:59,013 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:59,013 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:59,013 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 2 times [2022-04-06 15:22:59,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:59,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343434221] [2022-04-06 15:22:59,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:59,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:59,022 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:59,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [404913801] [2022-04-06 15:22:59,022 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:59,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:59,022 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:59,023 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) [2022-04-06 15:22:59,026 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 15:22:59,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:59,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:59,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 15:22:59,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:59,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:59,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:59,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 15:22:59,265 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:59,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343434221] [2022-04-06 15:22:59,265 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:59,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404913801] [2022-04-06 15:22:59,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404913801] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:22:59,266 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:22:59,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-04-06 15:22:59,266 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:59,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [16401467] [2022-04-06 15:22:59,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [16401467] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:59,266 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:59,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 15:22:59,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747129808] [2022-04-06 15:22:59,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:59,267 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 15:22:59,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:59,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 15:22:59,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-04-06 15:22:59,267 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:59,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:59,341 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2022-04-06 15:22:59,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:22:59,342 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-04-06 15:22:59,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:59,342 INFO L225 Difference]: With dead ends: 53 [2022-04-06 15:22:59,342 INFO L226 Difference]: Without dead ends: 51 [2022-04-06 15:22:59,343 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-04-06 15:22:59,343 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:59,344 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 111 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:59,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-04-06 15:22:59,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2022-04-06 15:22:59,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 35 states have internal predecessors, (39), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 15:22:59,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-04-06 15:22:59,350 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 22 [2022-04-06 15:22:59,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:59,350 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-04-06 15:22:59,350 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:59,350 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-04-06 15:22:59,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-06 15:22:59,350 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:59,351 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:59,369 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:59,563 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 [2022-04-06 15:22:59,563 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:59,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:59,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 1 times [2022-04-06 15:22:59,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:59,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [671236947] [2022-04-06 15:22:59,567 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:59,567 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:59,567 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:59,567 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 2 times [2022-04-06 15:22:59,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:59,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688488061] [2022-04-06 15:22:59,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:59,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:59,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:59,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1133959795] [2022-04-06 15:22:59,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:59,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:59,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:59,575 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) [2022-04-06 15:22:59,617 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 15:22:59,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:59,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:59,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 15:22:59,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:59,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:59,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:59,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:59,706 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:59,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688488061] [2022-04-06 15:22:59,707 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:59,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133959795] [2022-04-06 15:22:59,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133959795] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:22:59,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:22:59,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-04-06 15:22:59,707 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:59,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [671236947] [2022-04-06 15:22:59,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [671236947] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:59,707 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:59,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:22:59,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255797650] [2022-04-06 15:22:59,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:59,708 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 15:22:59,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:59,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 15:22:59,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-04-06 15:22:59,708 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:59,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:59,725 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-04-06 15:22:59,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 15:22:59,725 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-04-06 15:22:59,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:59,727 INFO L225 Difference]: With dead ends: 54 [2022-04-06 15:22:59,727 INFO L226 Difference]: Without dead ends: 46 [2022-04-06 15:22:59,727 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-04-06 15:22:59,727 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 3 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:59,728 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 74 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:22:59,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-04-06 15:22:59,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-04-06 15:22:59,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 35 states have internal predecessors, (38), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 15:22:59,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-04-06 15:22:59,733 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 23 [2022-04-06 15:22:59,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:59,733 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-04-06 15:22:59,733 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 15:22:59,734 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-04-06 15:22:59,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-06 15:22:59,734 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:59,734 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:59,753 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:59,950 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 [2022-04-06 15:22:59,950 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:59,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:59,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 1 times [2022-04-06 15:22:59,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:59,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [70797462] [2022-04-06 15:22:59,953 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:59,953 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:59,953 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:59,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 2 times [2022-04-06 15:22:59,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:59,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144797090] [2022-04-06 15:22:59,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:59,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:59,962 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:59,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [865105376] [2022-04-06 15:22:59,963 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:59,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:59,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:59,964 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) [2022-04-06 15:22:59,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 15:23:00,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:23:00,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:23:00,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-06 15:23:00,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:23:00,232 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 15:23:00,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:23:00,600 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 15:23:00,601 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:23:00,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144797090] [2022-04-06 15:23:00,601 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:23:00,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865105376] [2022-04-06 15:23:00,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865105376] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:23:00,601 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:23:00,601 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2022-04-06 15:23:00,601 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:23:00,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [70797462] [2022-04-06 15:23:00,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [70797462] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:23:00,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:23:00,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 15:23:00,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016003985] [2022-04-06 15:23:00,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:23:00,602 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 15:23:00,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:23:00,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 15:23:00,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-04-06 15:23:00,603 INFO L87 Difference]: Start difference. First operand 46 states and 50 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:23:00,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:23:00,792 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2022-04-06 15:23:00,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 15:23:00,792 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2022-04-06 15:23:00,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:23:00,793 INFO L225 Difference]: With dead ends: 57 [2022-04-06 15:23:00,793 INFO L226 Difference]: Without dead ends: 49 [2022-04-06 15:23:00,793 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-04-06 15:23:00,794 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 17 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:23:00,794 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 139 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:23:00,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-04-06 15:23:00,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38. [2022-04-06 15:23:00,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 28 states have internal predecessors, (32), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:23:00,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-04-06 15:23:00,798 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2022-04-06 15:23:00,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:23:00,798 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-04-06 15:23:00,799 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:23:00,799 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-04-06 15:23:00,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-04-06 15:23:00,799 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:23:00,799 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:23:00,818 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 15:23:01,007 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 [2022-04-06 15:23:01,008 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:23:01,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:23:01,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 3 times [2022-04-06 15:23:01,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:23:01,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2119948365] [2022-04-06 15:23:01,011 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:23:01,011 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:23:01,011 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:23:01,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 4 times [2022-04-06 15:23:01,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:23:01,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566666306] [2022-04-06 15:23:01,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:23:01,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:23:01,017 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:23:01,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567650078] [2022-04-06 15:23:01,017 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 15:23:01,017 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:23:01,017 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:23:01,018 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) [2022-04-06 15:23:01,020 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 15:23:01,051 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 15:23:01,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:23:01,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 15:23:01,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:23:01,116 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:23:21,019 WARN L232 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 15:23:31,047 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse1 (* (- 2) c_main_~X~0 c_main_~y~0)) (.cse0 (* 2 c_main_~Y~0 c_main_~x~0))) (and (= c_main_~v~0 (+ (* c_main_~Y~0 4) .cse0 (* (- 1) c_main_~X~0) .cse1)) (or (= (mod (let ((.cse2 (* (- 2) c_main_~Y~0))) (+ (div (+ (* (- 1) .cse1) .cse2 (* (- 1) .cse0)) (- 2)) .cse2 (* c_main_~X~0 c_main_~y~0))) c_main_~Y~0) 0) (= c_main_~Y~0 0)))) is different from true [2022-04-06 15:23:37,066 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 c_main_~Y~0 (+ (- 1) c_main_~x~0))) (.cse1 (* (- 2) c_main_~X~0 c_main_~y~0))) (and (or (= (mod (let ((.cse0 (* (- 2) c_main_~Y~0))) (+ .cse0 (div (+ (* (- 1) .cse1) .cse0 (* (- 1) .cse2)) (- 2)) (* c_main_~X~0 c_main_~y~0))) c_main_~Y~0) 0) (= c_main_~Y~0 0)) (= (+ (* c_main_~Y~0 4) .cse2 (* (- 1) c_main_~X~0) .cse1) c_main_~v~0))) is different from true [2022-04-06 15:23:41,086 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:23:41,089 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:23:41,091 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:23:41,096 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:23:49,222 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse4 (= c_main_~Y~0 0))) (let ((.cse0 (= c_main_~X~0 0)) (.cse5 (= c_main_~yx~0 0)) (.cse1 (not .cse4))) (or (and .cse0 (= c_main_~xy~0 0) (or (let ((.cse2 (div c_main_~yx~0 c_main_~Y~0))) (and (= (mod c_main_~yx~0 c_main_~Y~0) 0) .cse1 (= (+ (* .cse2 c_main_~Y~0) c_main_~Y~0 (div (+ c_main_~v~0 c_main_~X~0) (- 2))) 0) (exists ((main_~y~0 Int)) (= (mod (let ((.cse3 (* (- 2) c_main_~Y~0))) (+ .cse3 (div (+ (* (* (- 2) main_~y~0 c_main_~X~0) (- 1)) .cse3 (* (- 1) (* (+ (- 1) (div c_main_~yx~0 c_main_~Y~0)) 2 c_main_~Y~0))) (- 2)) (* main_~y~0 c_main_~X~0))) c_main_~Y~0) 0)) (= (mod (+ c_main_~v~0 c_main_~X~0 (* .cse2 (- 2) c_main_~Y~0)) 2) 0))) (and (exists ((main_~x~0 Int) (main_~y~0 Int)) (= (+ (* 2 c_main_~Y~0) (* 2 (* main_~x~0 c_main_~Y~0))) (+ (* 2 (* main_~y~0 c_main_~X~0)) c_main_~v~0 c_main_~X~0))) .cse4 .cse5))) (and (not .cse0) (= (mod c_main_~xy~0 c_main_~X~0) 0) (let ((.cse13 (div c_main_~xy~0 c_main_~X~0))) (let ((.cse11 (* .cse13 (- 2) c_main_~X~0))) (let ((.cse8 (= (mod (+ .cse11 c_main_~v~0 c_main_~X~0) 2) 0)) (.cse6 (* .cse13 c_main_~X~0)) (.cse7 (div (+ (* (- 1) c_main_~X~0) (* (- 1) c_main_~v~0)) (- 2)))) (or (and (= (+ .cse6 .cse7) c_main_~Y~0) .cse8 .cse5) (let ((.cse12 (+ (* (- 1) c_main_~Y~0) .cse6 .cse7))) (let ((.cse10 (div .cse12 c_main_~Y~0))) (and (= (mod (let ((.cse9 (* (- 2) c_main_~Y~0))) (+ .cse6 .cse9 (div (+ (* (* 2 c_main_~Y~0 (+ .cse10 (- 1))) (- 1)) .cse9 (* (- 1) .cse11)) (- 2)))) c_main_~Y~0) 0) .cse1 (= (mod .cse12 c_main_~Y~0) 0) .cse8 (= c_main_~yx~0 (* .cse10 c_main_~Y~0))))))))))))) is different from true [2022-04-06 15:23:49,359 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 5 not checked. [2022-04-06 15:23:49,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:23:49,800 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-06 15:23:49,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:23:49,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566666306] [2022-04-06 15:23:49,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:23:49,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567650078] [2022-04-06 15:23:49,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567650078] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:23:49,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:23:49,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 18 [2022-04-06 15:23:49,801 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:23:49,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2119948365] [2022-04-06 15:23:49,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2119948365] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:23:49,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:23:49,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 15:23:49,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000696228] [2022-04-06 15:23:49,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:23:49,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 15:23:49,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:23:49,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 15:23:49,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=170, Unknown=7, NotChecked=84, Total=306 [2022-04-06 15:23:49,803 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:24:06,045 WARN L232 SmtUtils]: Spent 16.15s on a formula simplification. DAG size of input: 45 DAG size of output: 32 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 15:24:19,972 WARN L232 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 33 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 15:24:21,991 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 [] [2022-04-06 15:24:24,016 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 [] [2022-04-06 15:24:26,104 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 c_main_~Y~0 (+ (- 1) c_main_~x~0))) (.cse4 (= c_main_~Y~0 0)) (.cse0 (* (- 2) c_main_~Y~0)) (.cse5 (* (- 1) c_main_~X~0)) (.cse1 (* (- 2) c_main_~X~0 c_main_~y~0)) (.cse3 (* c_main_~X~0 c_main_~y~0))) (and (or (= (mod (+ .cse0 (div (+ (* (- 1) .cse1) .cse0 (* (- 1) .cse2)) (- 2)) .cse3) c_main_~Y~0) 0) .cse4) (= (+ (* c_main_~Y~0 4) .cse2 .cse5 .cse1) c_main_~v~0) (let ((.cse6 (= 0 (mod (+ .cse1 c_main_~v~0 c_main_~X~0) 2))) (.cse7 (+ .cse0 (div (+ .cse5 (* (- 1) c_main_~v~0)) (- 2)) .cse3))) (or (and .cse6 (not .cse4) (= (mod .cse7 c_main_~Y~0) 0) (<= (+ (div .cse7 c_main_~Y~0) 1) c_main_~x~0)) (and .cse6 (= .cse7 0) .cse4))) (= (+ (* 2 (* c_main_~Y~0 c_main_~x~0)) (* 2 c_main_~Y~0)) (+ (* 2 .cse3) c_main_~v~0 c_main_~X~0)))) is different from true [2022-04-06 15:24:28,109 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:24:30,145 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 c_main_~Y~0 (+ (- 1) c_main_~x~0))) (.cse4 (= c_main_~Y~0 0)) (.cse0 (* (- 2) c_main_~Y~0)) (.cse5 (* (- 1) c_main_~X~0)) (.cse3 (* c_main_~X~0 c_main_~y~0)) (.cse1 (* (- 2) c_main_~X~0 c_main_~y~0))) (and (or (= (mod (+ .cse0 (div (+ (* (- 1) .cse1) .cse0 (* (- 1) .cse2)) (- 2)) .cse3) c_main_~Y~0) 0) .cse4) (= (+ (* c_main_~Y~0 4) .cse2 .cse5 .cse1) c_main_~v~0) (let ((.cse6 (= 0 (mod (+ .cse1 c_main_~v~0 c_main_~X~0) 2))) (.cse7 (+ .cse0 (div (+ .cse5 (* (- 1) c_main_~v~0)) (- 2)) .cse3))) (or (and .cse6 (not .cse4) (= (mod .cse7 c_main_~Y~0) 0) (<= (+ (div .cse7 c_main_~Y~0) 1) c_main_~x~0)) (and .cse6 (= .cse7 0) .cse4))))) is different from true [2022-04-06 15:26:16,134 WARN L232 SmtUtils]: Spent 1.60m on a formula simplification. DAG size of input: 106 DAG size of output: 86 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 15:26:18,145 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:18,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:26:18,347 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2022-04-06 15:26:18,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 15:26:18,347 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2022-04-06 15:26:18,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:26:18,348 INFO L225 Difference]: With dead ends: 60 [2022-04-06 15:26:18,348 INFO L226 Difference]: Without dead ends: 56 [2022-04-06 15:26:18,348 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 163.5s TimeCoverageRelationStatistics Valid=86, Invalid=299, Unknown=15, NotChecked=200, Total=600 [2022-04-06 15:26:18,349 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 28 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 12 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2022-04-06 15:26:18,349 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 82 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 104 Invalid, 4 Unknown, 129 Unchecked, 8.4s Time] [2022-04-06 15:26:18,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-04-06 15:26:18,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2022-04-06 15:26:18,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:26:18,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-04-06 15:26:18,360 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2022-04-06 15:26:18,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:26:18,360 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-04-06 15:26:18,360 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:26:18,360 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-04-06 15:26:18,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-04-06 15:26:18,361 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:26:18,361 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:26:18,384 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 15:26:18,561 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 [2022-04-06 15:26:18,561 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:26:18,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:26:18,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1756989579, now seen corresponding path program 1 times [2022-04-06 15:26:18,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:18,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1161263529] [2022-04-06 15:26:18,567 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:26:18,567 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:26:18,567 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:26:18,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1756989579, now seen corresponding path program 2 times [2022-04-06 15:26:18,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:26:18,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834744307] [2022-04-06 15:26:18,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:26:18,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:26:18,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:26:18,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568271441] [2022-04-06 15:26:18,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:26:18,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:26:18,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:26:18,574 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) [2022-04-06 15:26:18,575 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 15:26:18,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:26:18,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:26:18,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 15:26:18,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:26:18,670 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:26:18,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:26:18,748 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 15:26:18,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:26:18,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834744307] [2022-04-06 15:26:18,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:26:18,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568271441] [2022-04-06 15:26:18,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568271441] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:26:18,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:26:18,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 15:26:18,749 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:26:18,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1161263529] [2022-04-06 15:26:18,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1161263529] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:26:18,749 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:26:18,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 15:26:18,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900107227] [2022-04-06 15:26:18,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:26:18,749 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 15:26:18,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:18,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 15:26:18,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 15:26:18,750 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:26:18,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:26:18,793 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-04-06 15:26:18,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:26:18,794 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2022-04-06 15:26:18,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:26:18,794 INFO L225 Difference]: With dead ends: 50 [2022-04-06 15:26:18,794 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 15:26:18,795 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:26:18,795 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:26:18,795 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 75 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:26:18,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 15:26:18,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-04-06 15:26:18,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:26:18,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2022-04-06 15:26:18,810 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2022-04-06 15:26:18,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:26:18,810 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2022-04-06 15:26:18,810 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:26:18,810 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2022-04-06 15:26:18,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-04-06 15:26:18,810 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:26:18,811 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:26:18,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 15:26:19,023 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 [2022-04-06 15:26:19,024 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:26:19,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:26:19,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1565736524, now seen corresponding path program 1 times [2022-04-06 15:26:19,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:19,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [479313607] [2022-04-06 15:26:19,032 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:26:19,032 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:26:19,032 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:26:19,032 INFO L85 PathProgramCache]: Analyzing trace with hash -1565736524, now seen corresponding path program 2 times [2022-04-06 15:26:19,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:26:19,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981378019] [2022-04-06 15:26:19,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:26:19,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:26:19,037 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:26:19,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1378667773] [2022-04-06 15:26:19,038 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:26:19,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:26:19,038 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:26:19,039 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) [2022-04-06 15:26:19,045 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 15:26:19,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:26:19,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:26:19,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-04-06 15:26:19,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:26:19,175 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:26:19,178 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:26:21,387 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 15:26:21,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:26:21,597 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 15:26:21,597 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:26:21,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981378019] [2022-04-06 15:26:21,597 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:26:21,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378667773] [2022-04-06 15:26:21,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378667773] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:26:21,598 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:26:21,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2022-04-06 15:26:21,598 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:26:21,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [479313607] [2022-04-06 15:26:21,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [479313607] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:26:21,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:26:21,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 15:26:21,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896396937] [2022-04-06 15:26:21,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:26:21,599 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 15:26:21,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:21,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 15:26:21,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=146, Unknown=1, NotChecked=0, Total=182 [2022-04-06 15:26:21,599 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:26:23,609 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:27,667 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:29,673 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:31,678 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:33,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:35,727 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 15:26:37,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:26:37,874 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2022-04-06 15:26:37,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 15:26:37,874 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2022-04-06 15:26:37,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:26:37,875 INFO L225 Difference]: With dead ends: 67 [2022-04-06 15:26:37,875 INFO L226 Difference]: Without dead ends: 61 [2022-04-06 15:26:37,875 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=66, Invalid=237, Unknown=3, NotChecked=0, Total=306 [2022-04-06 15:26:37,876 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 8 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2022-04-06 15:26:37,876 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 88 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 99 Invalid, 6 Unknown, 0 Unchecked, 12.2s Time] [2022-04-06 15:26:37,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-04-06 15:26:37,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2022-04-06 15:26:37,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 states have internal predecessors, (54), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 15:26:37,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2022-04-06 15:26:37,894 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 39 [2022-04-06 15:26:37,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:26:37,894 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2022-04-06 15:26:37,895 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 15:26:37,895 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2022-04-06 15:26:37,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-04-06 15:26:37,896 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:26:37,896 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:26:37,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 15:26:38,112 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 [2022-04-06 15:26:38,112 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:26:38,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:26:38,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1449367094, now seen corresponding path program 1 times [2022-04-06 15:26:38,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:38,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1540860472] [2022-04-06 15:26:38,117 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:26:38,117 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:26:38,117 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:26:38,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1449367094, now seen corresponding path program 2 times [2022-04-06 15:26:38,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:26:38,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889411543] [2022-04-06 15:26:38,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:26:38,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:26:38,122 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:26:38,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [926255968] [2022-04-06 15:26:38,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:26:38,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:26:38,122 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:26:38,123 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) [2022-04-06 15:26:38,124 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 15:26:38,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:26:38,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:26:38,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-06 15:26:38,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:26:38,296 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 15:26:38,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:26:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 15:26:38,424 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:26:38,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889411543] [2022-04-06 15:26:38,424 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:26:38,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926255968] [2022-04-06 15:26:38,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926255968] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:26:38,424 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 15:26:38,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-04-06 15:26:38,425 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:26:38,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1540860472] [2022-04-06 15:26:38,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1540860472] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:26:38,425 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:26:38,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:26:38,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362779560] [2022-04-06 15:26:38,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:26:38,425 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 15:26:38,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:38,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 15:26:38,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:26:38,426 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:26:38,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:26:38,495 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-04-06 15:26:38,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 15:26:38,495 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2022-04-06 15:26:38,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:26:38,496 INFO L225 Difference]: With dead ends: 72 [2022-04-06 15:26:38,496 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 15:26:38,496 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:26:38,497 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:26:38,497 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 85 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:26:38,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 15:26:38,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-04-06 15:26:38,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 9 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 15:26:38,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2022-04-06 15:26:38,514 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 39 [2022-04-06 15:26:38,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:26:38,514 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2022-04-06 15:26:38,515 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:26:38,515 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2022-04-06 15:26:38,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-04-06 15:26:38,518 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:26:38,518 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:26:38,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 15:26:38,734 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 [2022-04-06 15:26:38,735 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:26:38,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:26:38,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1425187914, now seen corresponding path program 3 times [2022-04-06 15:26:38,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:26:38,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1348111923] [2022-04-06 15:26:38,740 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:26:38,740 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:26:38,740 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:26:38,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1425187914, now seen corresponding path program 4 times [2022-04-06 15:26:38,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:26:38,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131598399] [2022-04-06 15:26:38,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:26:38,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:26:38,756 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:26:38,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1994339735] [2022-04-06 15:26:38,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 15:26:38,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:26:38,756 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:26:38,758 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) [2022-04-06 15:26:38,782 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 15:26:39,482 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 15:26:39,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:26:39,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 47 conjunts are in the unsatisfiable core [2022-04-06 15:26:39,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:26:40,204 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:26:40,208 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 15:26:40,210 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful