/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_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 13:56:17,381 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 13:56:17,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 13:56:17,442 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 13:56:17,482 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 13:56:17,483 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 13:56:17,489 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 13:56:17,490 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 13:56:17,500 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 13:56:17,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 13:56:17,502 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 13:56:17,502 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 13:56:17,502 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 13:56:17,503 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 13:56:17,503 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 13:56:17,503 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 13:56:17,503 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 13:56:17,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 13:56:17,504 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:56:17,505 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 13:56:17,505 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 13:56:17,506 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 13:56:17,506 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 13:56:17,757 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 13:56:17,788 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 13:56:17,789 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 13:56:17,790 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 13:56:17,790 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 13:56:17,791 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound20.c [2022-03-20 13:56:17,846 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df4ceb8a4/a8e4ff721272417e9f2425a622c11fa5/FLAGaeae63a4c [2022-03-20 13:56:18,276 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 13:56:18,276 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound20.c [2022-03-20 13:56:18,282 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df4ceb8a4/a8e4ff721272417e9f2425a622c11fa5/FLAGaeae63a4c [2022-03-20 13:56:18,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df4ceb8a4/a8e4ff721272417e9f2425a622c11fa5 [2022-03-20 13:56:18,678 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 13:56:18,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 13:56:18,682 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 13:56:18,682 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 13:56:18,686 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 13:56:18,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,687 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e86437a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18, skipping insertion in model container [2022-03-20 13:56:18,687 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,693 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 13:56:18,707 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 13:56:18,823 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_unwindbound20.c[597,610] [2022-03-20 13:56:18,837 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:56:18,843 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 13:56:18,854 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_unwindbound20.c[597,610] [2022-03-20 13:56:18,860 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:56:18,869 INFO L208 MainTranslator]: Completed translation [2022-03-20 13:56:18,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18 WrapperNode [2022-03-20 13:56:18,869 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 13:56:18,870 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 13:56:18,870 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 13:56:18,870 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 13:56:18,877 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,882 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,883 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,886 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,890 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,891 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 13:56:18,892 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 13:56:18,892 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 13:56:18,892 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 13:56:18,893 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (1/1) ... [2022-03-20 13:56:18,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:56:18,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:18,920 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 13:56:18,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 13:56:18,952 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 13:56:18,952 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 13:56:18,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 13:56:18,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 13:56:18,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 13:56:18,954 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 13:56:18,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 13:56:19,013 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 13:56:19,014 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 13:56:19,125 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 13:56:19,130 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 13:56:19,130 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 13:56:19,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:56:19 BoogieIcfgContainer [2022-03-20 13:56:19,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 13:56:19,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 13:56:19,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 13:56:19,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 13:56:19,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 01:56:18" (1/3) ... [2022-03-20 13:56:19,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41330c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:56:19, skipping insertion in model container [2022-03-20 13:56:19,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:56:18" (2/3) ... [2022-03-20 13:56:19,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41330c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:56:19, skipping insertion in model container [2022-03-20 13:56:19,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:56:19" (3/3) ... [2022-03-20 13:56:19,152 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_unwindbound20.c [2022-03-20 13:56:19,156 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 13:56:19,156 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 13:56:19,217 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 13:56:19,223 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 13:56:19,223 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 13:56:19,252 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) [2022-03-20 13:56:19,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 13:56:19,260 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:19,260 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:19,261 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:19,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:19,265 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 1 times [2022-03-20 13:56:19,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:19,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [15796397] [2022-03-20 13:56:19,288 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:56:19,289 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 2 times [2022-03-20 13:56:19,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:19,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234676076] [2022-03-20 13:56:19,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:19,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:19,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:56:19,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:56:19,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:56:19,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:19,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:19,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234676076] [2022-03-20 13:56:19,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234676076] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:19,487 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:19,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:56:19,489 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:19,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [15796397] [2022-03-20 13:56:19,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [15796397] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:19,489 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:19,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:56:19,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50678389] [2022-03-20 13:56:19,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:19,493 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 13:56:19,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:19,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 13:56:19,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 13:56:19,525 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) [2022-03-20 13:56:19,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:19,604 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2022-03-20 13:56:19,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 13:56:19,607 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 [2022-03-20 13:56:19,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:19,617 INFO L225 Difference]: With dead ends: 45 [2022-03-20 13:56:19,618 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 13:56:19,621 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 [2022-03-20 13:56:19,624 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 [2022-03-20 13:56:19,626 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] [2022-03-20 13:56:19,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 13:56:19,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-03-20 13:56:19,669 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) [2022-03-20 13:56:19,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-20 13:56:19,670 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 12 [2022-03-20 13:56:19,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:19,671 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-20 13:56:19,671 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) [2022-03-20 13:56:19,671 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-20 13:56:19,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 13:56:19,672 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:19,672 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:19,672 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 13:56:19,672 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:19,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:19,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 1 times [2022-03-20 13:56:19,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:19,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [63736573] [2022-03-20 13:56:19,674 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:56:19,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 2 times [2022-03-20 13:56:19,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:19,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137549402] [2022-03-20 13:56:19,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:19,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:19,709 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:19,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2132968008] [2022-03-20 13:56:19,710 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:19,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:19,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:19,713 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:19,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 13:56:19,762 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 13:56:19,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:19,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 13:56:19,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:19,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:19,878 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 13:56:19,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:19,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137549402] [2022-03-20 13:56:19,879 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:19,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132968008] [2022-03-20 13:56:19,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132968008] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:19,879 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:19,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:56:19,880 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:19,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [63736573] [2022-03-20 13:56:19,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [63736573] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:19,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:19,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:56:19,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453252137] [2022-03-20 13:56:19,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:19,882 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 13:56:19,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:19,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 13:56:19,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 13:56:19,883 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) [2022-03-20 13:56:19,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:19,961 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-03-20 13:56:19,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 13:56:19,962 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 [2022-03-20 13:56:19,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:19,964 INFO L225 Difference]: With dead ends: 34 [2022-03-20 13:56:19,964 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 13:56:19,964 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 [2022-03-20 13:56:19,966 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:19,966 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 70 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:56:19,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 13:56:19,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-03-20 13:56:19,974 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) [2022-03-20 13:56:19,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-03-20 13:56:19,975 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 12 [2022-03-20 13:56:19,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:19,975 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-03-20 13:56:19,976 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) [2022-03-20 13:56:19,976 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-03-20 13:56:19,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 13:56:19,976 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:19,977 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:20,003 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:20,200 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:20,200 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:20,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:20,201 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 1 times [2022-03-20 13:56:20,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:20,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [526791343] [2022-03-20 13:56:20,218 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:20,218 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:20,218 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:20,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 2 times [2022-03-20 13:56:20,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:20,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077512229] [2022-03-20 13:56:20,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:20,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:20,243 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:20,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568008710] [2022-03-20 13:56:20,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:20,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:20,244 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:20,253 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:20,257 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 13:56:20,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:20,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:20,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 13:56:20,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:20,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:20,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 13:56:20,694 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:20,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077512229] [2022-03-20 13:56:20,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:20,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568008710] [2022-03-20 13:56:20,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568008710] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:20,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:20,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-03-20 13:56:20,696 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:20,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [526791343] [2022-03-20 13:56:20,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [526791343] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:20,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:20,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 13:56:20,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112998774] [2022-03-20 13:56:20,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:20,699 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 13:56:20,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:20,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 13:56:20,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 13:56:20,701 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) [2022-03-20 13:56:20,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:20,817 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-03-20 13:56:20,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:56:20,818 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 [2022-03-20 13:56:20,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:20,822 INFO L225 Difference]: With dead ends: 44 [2022-03-20 13:56:20,822 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 13:56:20,824 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 [2022-03-20 13:56:20,832 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:20,832 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 121 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:56:20,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 13:56:20,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-03-20 13:56:20,840 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) [2022-03-20 13:56:20,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-03-20 13:56:20,841 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 22 [2022-03-20 13:56:20,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:20,842 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-03-20 13:56:20,842 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) [2022-03-20 13:56:20,842 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-03-20 13:56:20,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 13:56:20,843 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:20,843 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:20,870 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:21,067 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 13:56:21,068 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:21,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:21,069 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 1 times [2022-03-20 13:56:21,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:21,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1365302255] [2022-03-20 13:56:21,073 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:21,073 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:21,073 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:21,073 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 2 times [2022-03-20 13:56:21,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:21,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440739594] [2022-03-20 13:56:21,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:21,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:21,092 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:21,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [439419111] [2022-03-20 13:56:21,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:21,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:21,093 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:21,097 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:21,103 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 13:56:21,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:21,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:21,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:56:21,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:21,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:21,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:21,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 13:56:21,382 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:21,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440739594] [2022-03-20 13:56:21,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:21,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439419111] [2022-03-20 13:56:21,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439419111] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:21,390 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:21,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-03-20 13:56:21,390 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:21,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1365302255] [2022-03-20 13:56:21,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1365302255] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:21,393 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:21,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 13:56:21,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698481586] [2022-03-20 13:56:21,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:21,394 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 13:56:21,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:21,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 13:56:21,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 13:56:21,395 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) [2022-03-20 13:56:21,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:21,485 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2022-03-20 13:56:21,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:56:21,485 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 [2022-03-20 13:56:21,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:21,486 INFO L225 Difference]: With dead ends: 53 [2022-03-20 13:56:21,486 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 13:56:21,487 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 [2022-03-20 13:56:21,487 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:21,488 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 126 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:56:21,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 13:56:21,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2022-03-20 13:56:21,496 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) [2022-03-20 13:56:21,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-20 13:56:21,497 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 22 [2022-03-20 13:56:21,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:21,498 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-20 13:56:21,498 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) [2022-03-20 13:56:21,498 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-20 13:56:21,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 13:56:21,499 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:21,499 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] [2022-03-20 13:56:21,527 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:21,719 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:21,720 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:21,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:21,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 1 times [2022-03-20 13:56:21,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:21,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1478585548] [2022-03-20 13:56:21,724 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:21,724 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:21,724 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:21,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 2 times [2022-03-20 13:56:21,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:21,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314908674] [2022-03-20 13:56:21,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:21,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:21,733 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:21,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [722795670] [2022-03-20 13:56:21,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:21,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:21,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:21,735 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:21,755 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 13:56:21,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:21,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:21,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 13:56:21,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:21,834 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:21,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:21,891 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:21,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:21,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314908674] [2022-03-20 13:56:21,892 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:21,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722795670] [2022-03-20 13:56:21,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722795670] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:21,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:21,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-20 13:56:21,893 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:21,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1478585548] [2022-03-20 13:56:21,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1478585548] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:21,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:21,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:56:21,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075072855] [2022-03-20 13:56:21,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:21,893 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 13:56:21,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:21,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 13:56:21,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-03-20 13:56:21,894 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) [2022-03-20 13:56:21,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:21,918 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-20 13:56:21,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 13:56:21,918 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 [2022-03-20 13:56:21,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:21,920 INFO L225 Difference]: With dead ends: 54 [2022-03-20 13:56:21,920 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 13:56:21,921 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 [2022-03-20 13:56:21,921 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 [2022-03-20 13:56:21,922 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] [2022-03-20 13:56:21,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 13:56:21,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 13:56:21,929 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) [2022-03-20 13:56:21,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-03-20 13:56:21,930 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 23 [2022-03-20 13:56:21,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:21,930 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-03-20 13:56:21,931 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) [2022-03-20 13:56:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-03-20 13:56:21,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 13:56:21,931 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:21,931 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] [2022-03-20 13:56:21,957 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:22,154 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:22,155 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:22,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:22,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 1 times [2022-03-20 13:56:22,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:22,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [796977369] [2022-03-20 13:56:22,159 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:22,159 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:22,159 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:22,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 2 times [2022-03-20 13:56:22,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:22,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705740643] [2022-03-20 13:56:22,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:22,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:22,168 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:22,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [736177192] [2022-03-20 13:56:22,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:22,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:22,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:22,169 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:22,171 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 13:56:22,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:22,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:22,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 13:56:22,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 13:56:22,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:22,924 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 13:56:22,925 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:22,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705740643] [2022-03-20 13:56:22,925 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:22,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736177192] [2022-03-20 13:56:22,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736177192] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:22,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:22,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2022-03-20 13:56:22,926 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:22,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [796977369] [2022-03-20 13:56:22,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [796977369] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:22,926 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:22,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:56:22,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689944872] [2022-03-20 13:56:22,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:22,927 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 13:56:22,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:22,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 13:56:22,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-03-20 13:56:22,928 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) [2022-03-20 13:56:23,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:23,163 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2022-03-20 13:56:23,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 13:56:23,163 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 [2022-03-20 13:56:23,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:23,164 INFO L225 Difference]: With dead ends: 57 [2022-03-20 13:56:23,164 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 13:56:23,165 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-03-20 13:56:23,165 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 17 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:23,166 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 158 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:56:23,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 13:56:23,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38. [2022-03-20 13:56:23,172 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) [2022-03-20 13:56:23,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-03-20 13:56:23,173 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2022-03-20 13:56:23,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:23,173 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-03-20 13:56:23,173 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) [2022-03-20 13:56:23,173 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-03-20 13:56:23,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 13:56:23,174 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:23,174 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:23,203 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:23,395 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:23,395 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:23,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:23,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 3 times [2022-03-20 13:56:23,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:23,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [652365131] [2022-03-20 13:56:23,399 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:23,399 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:23,399 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:23,399 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 4 times [2022-03-20 13:56:23,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:23,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559247261] [2022-03-20 13:56:23,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:23,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:23,407 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:23,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1073203818] [2022-03-20 13:56:23,407 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:56:23,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:23,408 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:23,409 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:23,443 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 13:56:23,463 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:56:23,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:23,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 13:56:23,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:23,707 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 13:56:23,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:23,920 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 13:56:23,920 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:23,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559247261] [2022-03-20 13:56:23,920 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:23,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073203818] [2022-03-20 13:56:23,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073203818] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:23,921 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:23,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 18 [2022-03-20 13:56:23,921 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:23,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [652365131] [2022-03-20 13:56:23,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [652365131] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:23,921 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:23,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 13:56:23,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099125241] [2022-03-20 13:56:23,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:23,922 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 13:56:23,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:23,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 13:56:23,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2022-03-20 13:56:23,923 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 12 states have internal predecessors, (24), 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) [2022-03-20 13:56:24,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:24,109 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2022-03-20 13:56:24,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 13:56:24,110 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 12 states have internal predecessors, (24), 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 [2022-03-20 13:56:24,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:24,111 INFO L225 Difference]: With dead ends: 63 [2022-03-20 13:56:24,111 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 13:56:24,111 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-03-20 13:56:24,112 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 19 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:24,112 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 156 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:56:24,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 13:56:24,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2022-03-20 13:56:24,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 36 states have internal predecessors, (41), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:56:24,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2022-03-20 13:56:24,121 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 32 [2022-03-20 13:56:24,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:24,121 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2022-03-20 13:56:24,121 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 12 states have internal predecessors, (24), 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) [2022-03-20 13:56:24,121 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2022-03-20 13:56:24,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 13:56:24,122 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:24,122 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:24,146 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:24,322 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:24,323 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:24,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:24,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1882160230, now seen corresponding path program 1 times [2022-03-20 13:56:24,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:24,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [102588785] [2022-03-20 13:56:24,331 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:24,331 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:24,331 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:24,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1882160230, now seen corresponding path program 2 times [2022-03-20 13:56:24,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:24,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272513527] [2022-03-20 13:56:24,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:24,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:24,339 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:24,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1715449244] [2022-03-20 13:56:24,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:24,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:24,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:24,341 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:24,357 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 13:56:24,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:24,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:24,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 13:56:24,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:24,796 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:56:24,992 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:56:24,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:25,448 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 13:56:25,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:25,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272513527] [2022-03-20 13:56:25,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:25,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715449244] [2022-03-20 13:56:25,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715449244] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:25,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:25,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 20 [2022-03-20 13:56:25,450 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:25,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [102588785] [2022-03-20 13:56:25,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [102588785] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:25,450 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:25,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:56:25,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130785998] [2022-03-20 13:56:25,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:25,451 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 13:56:25,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:25,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 13:56:25,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-03-20 13:56:25,452 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 13 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) [2022-03-20 13:56:25,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:25,767 INFO L93 Difference]: Finished difference Result 74 states and 86 transitions. [2022-03-20 13:56:25,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 13:56:25,767 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 13 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 [2022-03-20 13:56:25,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:25,768 INFO L225 Difference]: With dead ends: 74 [2022-03-20 13:56:25,769 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 13:56:25,769 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2022-03-20 13:56:25,770 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 18 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:25,770 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 172 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:56:25,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 13:56:25,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2022-03-20 13:56:25,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 44 states have internal predecessors, (50), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 13:56:25,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2022-03-20 13:56:25,781 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 32 [2022-03-20 13:56:25,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:25,781 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2022-03-20 13:56:25,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 13 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) [2022-03-20 13:56:25,782 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2022-03-20 13:56:25,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 13:56:25,782 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:25,782 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:25,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:26,005 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:26,006 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:26,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:26,006 INFO L85 PathProgramCache]: Analyzing trace with hash 697362150, now seen corresponding path program 3 times [2022-03-20 13:56:26,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:26,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [322668018] [2022-03-20 13:56:26,010 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:26,010 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:26,010 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:26,010 INFO L85 PathProgramCache]: Analyzing trace with hash 697362150, now seen corresponding path program 4 times [2022-03-20 13:56:26,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:26,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744975954] [2022-03-20 13:56:26,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:26,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:26,018 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:26,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1160511079] [2022-03-20 13:56:26,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:56:26,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:26,018 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:26,019 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:26,047 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 13:56:26,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:56:26,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:26,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 13:56:26,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:26,412 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:56:26,608 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 13:56:26,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:27,266 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 13:56:27,267 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744975954] [2022-03-20 13:56:27,267 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160511079] [2022-03-20 13:56:27,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160511079] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:27,267 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:27,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 20 [2022-03-20 13:56:27,268 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:27,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [322668018] [2022-03-20 13:56:27,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [322668018] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:27,268 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:27,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:56:27,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920857663] [2022-03-20 13:56:27,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:27,268 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 13:56:27,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:27,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 13:56:27,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2022-03-20 13:56:27,269 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 14 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 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) [2022-03-20 13:56:27,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:27,671 INFO L93 Difference]: Finished difference Result 94 states and 108 transitions. [2022-03-20 13:56:27,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 13:56:27,671 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 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 [2022-03-20 13:56:27,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:27,672 INFO L225 Difference]: With dead ends: 94 [2022-03-20 13:56:27,672 INFO L226 Difference]: Without dead ends: 80 [2022-03-20 13:56:27,673 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2022-03-20 13:56:27,674 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 19 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:27,674 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 205 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:56:27,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-03-20 13:56:27,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2022-03-20 13:56:27,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 59 states have (on average 1.152542372881356) internal successors, (68), 60 states have internal predecessors, (68), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 13:56:27,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2022-03-20 13:56:27,689 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 32 [2022-03-20 13:56:27,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:27,689 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2022-03-20 13:56:27,689 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 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) [2022-03-20 13:56:27,689 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2022-03-20 13:56:27,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 13:56:27,690 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:27,690 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:27,715 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:27,913 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-20 13:56:27,913 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:27,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:27,914 INFO L85 PathProgramCache]: Analyzing trace with hash -111984476, now seen corresponding path program 3 times [2022-03-20 13:56:27,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:27,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [53633723] [2022-03-20 13:56:27,917 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:27,917 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:27,917 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:27,917 INFO L85 PathProgramCache]: Analyzing trace with hash -111984476, now seen corresponding path program 4 times [2022-03-20 13:56:27,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:27,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373532706] [2022-03-20 13:56:27,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:27,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:27,924 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:27,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2023930937] [2022-03-20 13:56:27,925 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:56:27,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:27,925 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:27,926 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:27,927 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 13:56:27,976 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:56:27,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:27,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 13:56:27,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:28,239 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:56:28,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:28,639 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:56:28,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:28,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373532706] [2022-03-20 13:56:28,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:28,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023930937] [2022-03-20 13:56:28,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023930937] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:28,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:28,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-03-20 13:56:28,640 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:28,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [53633723] [2022-03-20 13:56:28,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [53633723] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:28,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:28,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 13:56:28,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948401762] [2022-03-20 13:56:28,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:28,641 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 13:56:28,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:28,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 13:56:28,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2022-03-20 13:56:28,642 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:56:28,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:28,832 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2022-03-20 13:56:28,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 13:56:28,832 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2022-03-20 13:56:28,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:28,833 INFO L225 Difference]: With dead ends: 93 [2022-03-20 13:56:28,833 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 13:56:28,834 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-03-20 13:56:28,834 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:28,835 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 201 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:56:28,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 13:56:28,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2022-03-20 13:56:28,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 65 states have (on average 1.1538461538461537) internal successors, (75), 67 states have internal predecessors, (75), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 13:56:28,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2022-03-20 13:56:28,853 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 32 [2022-03-20 13:56:28,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:28,854 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2022-03-20 13:56:28,854 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:56:28,854 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2022-03-20 13:56:28,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 13:56:28,857 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:28,857 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:28,883 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:29,072 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 13:56:29,072 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:29,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:29,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1857919347, now seen corresponding path program 1 times [2022-03-20 13:56:29,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:29,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [54263864] [2022-03-20 13:56:29,076 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:29,077 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:29,077 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:29,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1857919347, now seen corresponding path program 2 times [2022-03-20 13:56:29,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:29,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603733373] [2022-03-20 13:56:29,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:29,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:29,094 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:29,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [892534504] [2022-03-20 13:56:29,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:56:29,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:29,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:29,104 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:29,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 13:56:29,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:56:29,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:29,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 13:56:29,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:29,219 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:56:29,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:56:29,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:29,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603733373] [2022-03-20 13:56:29,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:29,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892534504] [2022-03-20 13:56:29,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892534504] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:29,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:29,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-03-20 13:56:29,295 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:29,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [54263864] [2022-03-20 13:56:29,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [54263864] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:29,295 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:29,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:56:29,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882833160] [2022-03-20 13:56:29,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:29,296 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 13:56:29,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:29,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 13:56:29,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-03-20 13:56:29,297 INFO L87 Difference]: Start difference. First operand 86 states and 95 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) [2022-03-20 13:56:29,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:29,331 INFO L93 Difference]: Finished difference Result 94 states and 102 transitions. [2022-03-20 13:56:29,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:56:29,332 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 [2022-03-20 13:56:29,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:29,334 INFO L225 Difference]: With dead ends: 94 [2022-03-20 13:56:29,334 INFO L226 Difference]: Without dead ends: 86 [2022-03-20 13:56:29,334 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 [2022-03-20 13:56:29,335 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 5 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:29,335 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 91 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:56:29,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-20 13:56:29,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-03-20 13:56:29,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 67 states have internal predecessors, (72), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 13:56:29,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2022-03-20 13:56:29,362 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 33 [2022-03-20 13:56:29,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:29,363 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2022-03-20 13:56:29,364 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) [2022-03-20 13:56:29,365 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2022-03-20 13:56:29,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:56:29,370 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:29,370 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] [2022-03-20 13:56:29,395 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:29,591 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 13:56:29,591 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:29,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:29,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1589915704, now seen corresponding path program 3 times [2022-03-20 13:56:29,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:29,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1523421968] [2022-03-20 13:56:29,594 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:29,594 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:29,594 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:29,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1589915704, now seen corresponding path program 4 times [2022-03-20 13:56:29,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:29,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762348493] [2022-03-20 13:56:29,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:29,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:29,601 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:29,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1148896727] [2022-03-20 13:56:29,601 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:56:29,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:29,602 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:29,603 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:29,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 13:56:29,663 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:56:29,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:29,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 13:56:29,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:29,953 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 13:56:29,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:30,306 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 13:56:30,306 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:30,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762348493] [2022-03-20 13:56:30,306 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:30,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148896727] [2022-03-20 13:56:30,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148896727] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:30,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:30,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 24 [2022-03-20 13:56:30,307 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:30,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1523421968] [2022-03-20 13:56:30,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1523421968] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:30,307 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:30,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 13:56:30,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080236934] [2022-03-20 13:56:30,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:30,307 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 13:56:30,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:30,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 13:56:30,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2022-03-20 13:56:30,308 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:56:30,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:30,630 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2022-03-20 13:56:30,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 13:56:30,630 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2022-03-20 13:56:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:30,631 INFO L225 Difference]: With dead ends: 97 [2022-03-20 13:56:30,631 INFO L226 Difference]: Without dead ends: 89 [2022-03-20 13:56:30,632 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2022-03-20 13:56:30,632 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 18 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:30,632 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 209 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:56:30,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-20 13:56:30,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 78. [2022-03-20 13:56:30,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 59 states have (on average 1.11864406779661) internal successors, (66), 60 states have internal predecessors, (66), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 13:56:30,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2022-03-20 13:56:30,646 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 39 [2022-03-20 13:56:30,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:30,646 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2022-03-20 13:56:30,646 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:56:30,646 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2022-03-20 13:56:30,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 13:56:30,648 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:30,648 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:30,671 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:30,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 13:56:30,863 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:30,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:30,864 INFO L85 PathProgramCache]: Analyzing trace with hash -108827544, now seen corresponding path program 5 times [2022-03-20 13:56:30,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:30,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1763974754] [2022-03-20 13:56:30,867 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:30,867 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:30,867 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:30,867 INFO L85 PathProgramCache]: Analyzing trace with hash -108827544, now seen corresponding path program 6 times [2022-03-20 13:56:30,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:30,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54653385] [2022-03-20 13:56:30,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:30,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:30,880 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:30,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [359868404] [2022-03-20 13:56:30,880 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 13:56:30,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:30,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:30,885 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:30,886 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 13:56:30,938 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 13:56:30,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:30,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 13:56:30,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:31,078 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:56:31,506 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:56:31,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:56:31,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:31,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54653385] [2022-03-20 13:56:31,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:31,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359868404] [2022-03-20 13:56:31,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359868404] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:31,830 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:31,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2022-03-20 13:56:31,830 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:31,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1763974754] [2022-03-20 13:56:31,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1763974754] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:31,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:31,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 13:56:31,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803573652] [2022-03-20 13:56:31,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:31,831 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 13:56:31,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:31,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 13:56:31,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-03-20 13:56:31,832 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-03-20 13:56:48,023 WARN L232 SmtUtils]: Spent 16.17s on a formula simplification. DAG size of input: 45 DAG size of output: 33 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:56:52,160 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:56:54,267 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:56:58,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:56:58,308 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2022-03-20 13:56:58,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 13:56:58,308 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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 42 [2022-03-20 13:56:58,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:56:58,309 INFO L225 Difference]: With dead ends: 103 [2022-03-20 13:56:58,309 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 13:56:58,310 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=78, Invalid=340, Unknown=2, NotChecked=0, Total=420 [2022-03-20 13:56:58,310 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 20 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 9 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:56:58,311 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 89 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 93 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2022-03-20 13:56:58,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 13:56:58,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 88. [2022-03-20 13:56:58,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 67 states have (on average 1.1194029850746268) internal successors, (75), 68 states have internal predecessors, (75), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 13:56:58,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2022-03-20 13:56:58,326 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 42 [2022-03-20 13:56:58,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:56:58,326 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2022-03-20 13:56:58,327 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-03-20 13:56:58,327 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2022-03-20 13:56:58,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 13:56:58,327 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:56:58,327 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:56:58,351 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 13:56:58,528 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 13:56:58,528 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:56:58,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:56:58,529 INFO L85 PathProgramCache]: Analyzing trace with hash -918174170, now seen corresponding path program 5 times [2022-03-20 13:56:58,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:58,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [764956181] [2022-03-20 13:56:58,532 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:56:58,532 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:56:58,532 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:56:58,533 INFO L85 PathProgramCache]: Analyzing trace with hash -918174170, now seen corresponding path program 6 times [2022-03-20 13:56:58,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:56:58,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600381173] [2022-03-20 13:56:58,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:56:58,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:56:58,542 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:56:58,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [45016262] [2022-03-20 13:56:58,543 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 13:56:58,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:56:58,543 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:56:58,556 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:56:58,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 13:56:58,608 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 13:56:58,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:56:58,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 13:56:58,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:56:58,785 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:56:59,223 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 17 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:56:59,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:56:59,544 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:56:59,544 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:56:59,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600381173] [2022-03-20 13:56:59,544 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:56:59,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45016262] [2022-03-20 13:56:59,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45016262] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:56:59,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:56:59,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 17 [2022-03-20 13:56:59,545 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:56:59,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [764956181] [2022-03-20 13:56:59,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [764956181] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:56:59,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:56:59,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 13:56:59,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468844486] [2022-03-20 13:56:59,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:56:59,545 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 13:56:59,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:56:59,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 13:56:59,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2022-03-20 13:56:59,546 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 12 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 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) [2022-03-20 13:57:00,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:00,160 INFO L93 Difference]: Finished difference Result 103 states and 113 transitions. [2022-03-20 13:57:00,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 13:57:00,160 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 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 42 [2022-03-20 13:57:00,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:00,161 INFO L225 Difference]: With dead ends: 103 [2022-03-20 13:57:00,161 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 13:57:00,162 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2022-03-20 13:57:00,162 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 22 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:00,162 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 100 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:57:00,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 13:57:00,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2022-03-20 13:57:00,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.1466666666666667) internal successors, (86), 76 states have internal predecessors, (86), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 13:57:00,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2022-03-20 13:57:00,180 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 42 [2022-03-20 13:57:00,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:00,180 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2022-03-20 13:57:00,180 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 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) [2022-03-20 13:57:00,180 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2022-03-20 13:57:00,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 13:57:00,181 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:00,181 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:00,206 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:00,395 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 13:57:00,395 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:00,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:00,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1427647260, now seen corresponding path program 7 times [2022-03-20 13:57:00,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:00,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1018482590] [2022-03-20 13:57:00,399 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:00,399 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:00,399 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:00,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1427647260, now seen corresponding path program 8 times [2022-03-20 13:57:00,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:00,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734295629] [2022-03-20 13:57:00,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:00,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:00,410 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:00,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [437015044] [2022-03-20 13:57:00,410 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:57:00,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:00,410 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:00,411 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:00,412 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 13:57:00,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:57:00,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:00,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 13:57:00,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:00,859 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 13:57:00,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:01,328 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:57:01,328 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:01,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734295629] [2022-03-20 13:57:01,328 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:01,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437015044] [2022-03-20 13:57:01,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437015044] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:01,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:01,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 24 [2022-03-20 13:57:01,329 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:01,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1018482590] [2022-03-20 13:57:01,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1018482590] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:01,329 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:01,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 13:57:01,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906474028] [2022-03-20 13:57:01,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:01,330 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 13:57:01,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:01,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 13:57:01,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-03-20 13:57:01,330 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand has 17 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:01,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:01,685 INFO L93 Difference]: Finished difference Result 113 states and 126 transitions. [2022-03-20 13:57:01,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 13:57:01,686 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 42 [2022-03-20 13:57:01,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:01,687 INFO L225 Difference]: With dead ends: 113 [2022-03-20 13:57:01,687 INFO L226 Difference]: Without dead ends: 111 [2022-03-20 13:57:01,687 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2022-03-20 13:57:01,688 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 20 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:01,688 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 304 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 13:57:01,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-20 13:57:01,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 106. [2022-03-20 13:57:01,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 81 states have (on average 1.1481481481481481) internal successors, (93), 83 states have internal predecessors, (93), 13 states have call successors, (13), 12 states have call predecessors, (13), 11 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 13:57:01,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 117 transitions. [2022-03-20 13:57:01,705 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 117 transitions. Word has length 42 [2022-03-20 13:57:01,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:01,706 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 117 transitions. [2022-03-20 13:57:01,706 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:01,706 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 117 transitions. [2022-03-20 13:57:01,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 13:57:01,706 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:01,707 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:01,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:01,927 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:01,927 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:01,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:01,928 INFO L85 PathProgramCache]: Analyzing trace with hash 1682521956, now seen corresponding path program 9 times [2022-03-20 13:57:01,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:01,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1555047628] [2022-03-20 13:57:01,930 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:01,931 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:01,931 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:01,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1682521956, now seen corresponding path program 10 times [2022-03-20 13:57:01,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:01,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823142444] [2022-03-20 13:57:01,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:01,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:01,936 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:01,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [107926119] [2022-03-20 13:57:01,936 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:57:01,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:01,937 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:01,938 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:01,957 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 13:57:01,994 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:57:01,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:01,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 13:57:01,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:02,124 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:02,311 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 13:57:02,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:02,632 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:57:02,632 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823142444] [2022-03-20 13:57:02,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107926119] [2022-03-20 13:57:02,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107926119] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:02,636 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:02,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 19 [2022-03-20 13:57:02,636 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:02,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1555047628] [2022-03-20 13:57:02,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1555047628] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:02,636 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:02,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:57:02,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533264211] [2022-03-20 13:57:02,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:02,636 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 13:57:02,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:02,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 13:57:02,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2022-03-20 13:57:02,637 INFO L87 Difference]: Start difference. First operand 106 states and 117 transitions. Second operand has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:21,083 WARN L232 SmtUtils]: Spent 18.17s on a formula simplification. DAG size of input: 48 DAG size of output: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:57:21,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:21,329 INFO L93 Difference]: Finished difference Result 150 states and 171 transitions. [2022-03-20 13:57:21,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 13:57:21,330 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 42 [2022-03-20 13:57:21,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:21,331 INFO L225 Difference]: With dead ends: 150 [2022-03-20 13:57:21,331 INFO L226 Difference]: Without dead ends: 148 [2022-03-20 13:57:21,331 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2022-03-20 13:57:21,332 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 21 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:21,332 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 234 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 13:57:21,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-20 13:57:21,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 107. [2022-03-20 13:57:21,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 82 states have (on average 1.1585365853658536) internal successors, (95), 84 states have internal predecessors, (95), 13 states have call successors, (13), 12 states have call predecessors, (13), 11 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 13:57:21,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 119 transitions. [2022-03-20 13:57:21,362 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 119 transitions. Word has length 42 [2022-03-20 13:57:21,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:21,362 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 119 transitions. [2022-03-20 13:57:21,362 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:21,363 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 119 transitions. [2022-03-20 13:57:21,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 13:57:21,363 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:21,363 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:21,389 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:21,575 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 13:57:21,575 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:21,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:21,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1526027469, now seen corresponding path program 3 times [2022-03-20 13:57:21,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:21,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1128384583] [2022-03-20 13:57:21,579 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:21,579 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:21,579 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:21,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1526027469, now seen corresponding path program 4 times [2022-03-20 13:57:21,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:21,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292280490] [2022-03-20 13:57:21,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:21,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:21,587 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:21,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [315874639] [2022-03-20 13:57:21,587 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:57:21,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:21,588 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:21,595 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:21,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 13:57:21,646 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:57:21,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:21,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 13:57:21,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:21,721 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:57:21,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:21,811 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 13:57:21,811 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:21,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292280490] [2022-03-20 13:57:21,812 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:21,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315874639] [2022-03-20 13:57:21,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315874639] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:21,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:21,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-20 13:57:21,812 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:21,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1128384583] [2022-03-20 13:57:21,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1128384583] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:21,812 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:21,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 13:57:21,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618138233] [2022-03-20 13:57:21,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:21,813 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 13:57:21,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:21,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 13:57:21,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-03-20 13:57:21,814 INFO L87 Difference]: Start difference. First operand 107 states and 119 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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) [2022-03-20 13:57:21,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:21,873 INFO L93 Difference]: Finished difference Result 131 states and 144 transitions. [2022-03-20 13:57:21,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 13:57:21,873 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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) Word has length 43 [2022-03-20 13:57:21,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:21,874 INFO L225 Difference]: With dead ends: 131 [2022-03-20 13:57:21,874 INFO L226 Difference]: Without dead ends: 123 [2022-03-20 13:57:21,874 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2022-03-20 13:57:21,875 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 12 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:21,875 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 84 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:57:21,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-03-20 13:57:21,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2022-03-20 13:57:21,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 95 states have internal predecessors, (106), 14 states have call successors, (14), 13 states have call predecessors, (14), 12 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 13:57:21,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 132 transitions. [2022-03-20 13:57:21,898 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 132 transitions. Word has length 43 [2022-03-20 13:57:21,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:21,899 INFO L478 AbstractCegarLoop]: Abstraction has 120 states and 132 transitions. [2022-03-20 13:57:21,903 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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) [2022-03-20 13:57:21,903 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 132 transitions. [2022-03-20 13:57:21,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 13:57:21,904 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:21,904 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:21,923 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:22,115 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 13:57:22,115 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:22,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:22,116 INFO L85 PathProgramCache]: Analyzing trace with hash -684010378, now seen corresponding path program 1 times [2022-03-20 13:57:22,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:22,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [698839656] [2022-03-20 13:57:22,118 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:22,119 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:22,119 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:22,119 INFO L85 PathProgramCache]: Analyzing trace with hash -684010378, now seen corresponding path program 2 times [2022-03-20 13:57:22,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:22,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139757110] [2022-03-20 13:57:22,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:22,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:22,130 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:22,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [477584104] [2022-03-20 13:57:22,130 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:57:22,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:22,130 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:22,132 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:22,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 13:57:22,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:57:22,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:22,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 13:57:22,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:22,357 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 13:57:22,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:22,568 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 13:57:22,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:22,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139757110] [2022-03-20 13:57:22,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:22,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477584104] [2022-03-20 13:57:22,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [477584104] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:22,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:22,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-03-20 13:57:22,569 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:22,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [698839656] [2022-03-20 13:57:22,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [698839656] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:22,569 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:22,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 13:57:22,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961535754] [2022-03-20 13:57:22,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:22,569 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 13:57:22,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:22,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 13:57:22,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-20 13:57:22,570 INFO L87 Difference]: Start difference. First operand 120 states and 132 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:57:22,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:22,662 INFO L93 Difference]: Finished difference Result 136 states and 150 transitions. [2022-03-20 13:57:22,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 13:57:22,664 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 49 [2022-03-20 13:57:22,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:22,665 INFO L225 Difference]: With dead ends: 136 [2022-03-20 13:57:22,665 INFO L226 Difference]: Without dead ends: 128 [2022-03-20 13:57:22,665 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-03-20 13:57:22,666 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 3 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:22,666 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 173 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:57:22,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-03-20 13:57:22,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2022-03-20 13:57:22,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 97 states have (on average 1.134020618556701) internal successors, (110), 99 states have internal predecessors, (110), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 13:57:22,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 138 transitions. [2022-03-20 13:57:22,698 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 138 transitions. Word has length 49 [2022-03-20 13:57:22,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:22,698 INFO L478 AbstractCegarLoop]: Abstraction has 125 states and 138 transitions. [2022-03-20 13:57:22,698 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:57:22,698 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 138 transitions. [2022-03-20 13:57:22,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 13:57:22,699 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:22,700 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:22,716 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:22,900 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 13:57:22,900 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:22,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:22,901 INFO L85 PathProgramCache]: Analyzing trace with hash 736401910, now seen corresponding path program 3 times [2022-03-20 13:57:22,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:22,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [222900574] [2022-03-20 13:57:22,904 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:22,904 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:22,904 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:22,904 INFO L85 PathProgramCache]: Analyzing trace with hash 736401910, now seen corresponding path program 4 times [2022-03-20 13:57:22,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:22,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576764515] [2022-03-20 13:57:22,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:22,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:22,912 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:22,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1577089388] [2022-03-20 13:57:22,913 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:57:22,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:22,913 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:22,914 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:22,926 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 13:57:22,967 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:57:22,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:22,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 13:57:22,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:23,156 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 13:57:23,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:23,310 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 13:57:23,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:23,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576764515] [2022-03-20 13:57:23,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:23,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577089388] [2022-03-20 13:57:23,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577089388] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:23,310 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:23,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-03-20 13:57:23,311 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:23,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [222900574] [2022-03-20 13:57:23,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [222900574] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:23,311 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:23,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 13:57:23,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597876309] [2022-03-20 13:57:23,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:23,311 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 13:57:23,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:23,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 13:57:23,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-03-20 13:57:23,312 INFO L87 Difference]: Start difference. First operand 125 states and 138 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:57:23,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:23,405 INFO L93 Difference]: Finished difference Result 138 states and 153 transitions. [2022-03-20 13:57:23,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:57:23,406 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 49 [2022-03-20 13:57:23,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:23,407 INFO L225 Difference]: With dead ends: 138 [2022-03-20 13:57:23,407 INFO L226 Difference]: Without dead ends: 130 [2022-03-20 13:57:23,407 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-03-20 13:57:23,408 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 3 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:23,408 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 156 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:57:23,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-03-20 13:57:23,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 122. [2022-03-20 13:57:23,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 94 states have (on average 1.1382978723404256) internal successors, (107), 96 states have internal predecessors, (107), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 13:57:23,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 135 transitions. [2022-03-20 13:57:23,434 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 135 transitions. Word has length 49 [2022-03-20 13:57:23,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:23,434 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 135 transitions. [2022-03-20 13:57:23,434 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:57:23,434 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 135 transitions. [2022-03-20 13:57:23,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 13:57:23,435 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:23,435 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:23,452 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 13:57:23,639 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:23,639 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:23,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:23,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1528015880, now seen corresponding path program 5 times [2022-03-20 13:57:23,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:23,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [838289024] [2022-03-20 13:57:23,645 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:23,645 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:23,645 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:23,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1528015880, now seen corresponding path program 6 times [2022-03-20 13:57:23,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:23,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138531596] [2022-03-20 13:57:23,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:23,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:23,656 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:23,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [345104736] [2022-03-20 13:57:23,656 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 13:57:23,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:23,657 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:23,658 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:57:23,677 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 13:57:23,717 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 13:57:23,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:23,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 13:57:23,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:23,925 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:23,929 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:23,930 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:34,551 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 13:57:34,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:34,797 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:03:18,273 WARN L855 $PredicateComparison]: unable to prove that (or (forall ((aux_div_main_~v~0_57 Int) (aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 Int) (aux_div_aux_mod_main_~v~0_57_59 Int)) (let ((.cse6 (* c_main_~X~0 c_main_~y~0)) (.cse5 (* (- 1) c_main_~Y~0))) (or (let ((.cse0 (<= (+ aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 1) aux_div_aux_mod_main_~v~0_57_59)) (.cse1 (<= (+ aux_div_aux_mod_main_~v~0_57_59 1) aux_div_main_~v~0_57)) (.cse3 (<= (+ aux_div_main_~v~0_57 1) aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103))) (and (or .cse0 .cse1 (forall ((aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 Int)) (or (let ((.cse2 (div (+ (* (- 1) c_main_~Y~0) aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 c_main_~X~0 (* c_main_~X~0 c_main_~y~0)) c_main_~Y~0))) (<= (+ c_main_~Y~0 (* c_main_~Y~0 .cse2) c_main_~y~0 1) (+ .cse2 aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 (* .cse2 c_main_~y~0)))) (<= (+ aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 1) aux_div_aux_mod_main_~v~0_57_59) (<= (+ aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 1) aux_div_aux_mod_aux_mod_main_~v~0_57_59_81))) .cse3) (or (forall ((aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 Int)) (or (let ((.cse4 (div (+ (* (- 1) c_main_~Y~0) aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 c_main_~X~0 (* c_main_~X~0 c_main_~y~0)) c_main_~Y~0))) (<= (+ .cse4 aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 (* .cse4 c_main_~y~0)) (+ c_main_~Y~0 (* c_main_~Y~0 .cse4) c_main_~y~0 1))) (<= (+ aux_div_aux_mod_aux_mod_main_~v~0_57_59_81 1) aux_div_aux_mod_main_~v~0_57_59) (<= (+ aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 1) aux_div_aux_mod_aux_mod_main_~v~0_57_59_81))) .cse0 .cse1 .cse3))) (< (+ c_main_~X~0 1) (div (+ aux_div_aux_mod_main_~v~0_57_59 .cse5 c_main_~X~0 .cse6) c_main_~Y~0)) (<= (div (+ .cse5 aux_div_aux_mod_aux_mod_aux_mod_main_~v~0_57_59_81_103 c_main_~X~0 .cse6) c_main_~Y~0) c_main_~X~0) (not (= (mod (+ .cse5 (* c_main_~X~0 (+ c_main_~y~0 1)) aux_div_main_~v~0_57) c_main_~Y~0) 0))))) (= c_main_~Y~0 0)) is different from true [2022-03-20 14:06:09,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 14:06:09,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138531596] [2022-03-20 14:06:09,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 14:06:09,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345104736] [2022-03-20 14:06:09,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345104736] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 14:06:09,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 14:06:09,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-03-20 14:06:09,621 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 14:06:09,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [838289024] [2022-03-20 14:06:09,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [838289024] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 14:06:09,621 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 14:06:09,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 14:06:09,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701634384] [2022-03-20 14:06:09,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 14:06:09,622 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 14:06:09,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 14:06:09,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 14:06:09,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=460, Unknown=10, NotChecked=44, Total=600 [2022-03-20 14:06:09,623 INFO L87 Difference]: Start difference. First operand 122 states and 135 transitions. Second operand has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:06:12,422 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:16,570 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:20,751 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:25,914 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:32,853 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:34,862 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:06:35,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 14:06:35,251 INFO L93 Difference]: Finished difference Result 148 states and 165 transitions. [2022-03-20 14:06:35,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 14:06:35,252 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 49 [2022-03-20 14:06:35,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 14:06:35,253 INFO L225 Difference]: With dead ends: 148 [2022-03-20 14:06:35,253 INFO L226 Difference]: Without dead ends: 140 [2022-03-20 14:06:35,253 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 40.5s TimeCoverageRelationStatistics Valid=156, Invalid=828, Unknown=12, NotChecked=60, Total=1056 [2022-03-20 14:06:35,254 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 28 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 11 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-03-20 14:06:35,254 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 231 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 309 Invalid, 6 Unknown, 0 Unchecked, 13.1s Time] [2022-03-20 14:06:35,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-03-20 14:06:35,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 132. [2022-03-20 14:06:35,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 105 states have internal predecessors, (117), 17 states have call successors, (17), 13 states have call predecessors, (17), 12 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 14:06:35,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 149 transitions. [2022-03-20 14:06:35,280 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 149 transitions. Word has length 49 [2022-03-20 14:06:35,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 14:06:35,281 INFO L478 AbstractCegarLoop]: Abstraction has 132 states and 149 transitions. [2022-03-20 14:06:35,281 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:06:35,281 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 149 transitions. [2022-03-20 14:06:35,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 14:06:35,281 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 14:06:35,282 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 14:06:35,302 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 14:06:35,492 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:06:35,492 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 14:06:35,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 14:06:35,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1387467270, now seen corresponding path program 5 times [2022-03-20 14:06:35,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 14:06:35,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1579685474] [2022-03-20 14:06:35,494 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 14:06:35,494 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 14:06:35,494 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 14:06:35,494 INFO L85 PathProgramCache]: Analyzing trace with hash -1387467270, now seen corresponding path program 6 times [2022-03-20 14:06:35,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 14:06:35,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152693627] [2022-03-20 14:06:35,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 14:06:35,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 14:06:35,500 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 14:06:35,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2101028741] [2022-03-20 14:06:35,500 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 14:06:35,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:06:35,500 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 14:06:35,501 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 14:06:35,502 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 14:06:35,927 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 14:06:35,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 14:06:35,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 14:06:35,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 14:06:36,735 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:06:36,738 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:06:36,739 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:06:38,949 WARN L833 $PredicateComparison]: unable to prove that (and (let ((.cse3 (+ c_main_~X~0 1)) (.cse2 (+ (* (- 1) c_main_~Y~0) (div (+ c_main_~v~0 c_main_~X~0) 2) (* c_main_~X~0 c_main_~y~0))) (.cse0 (= c_main_~Y~0 0)) (.cse4 (= (mod (+ (* 2 c_main_~X~0 c_main_~y~0) c_main_~v~0 c_main_~X~0) 2) 0))) (or (let ((.cse1 (div .cse2 c_main_~Y~0))) (and (not .cse0) (not (<= .cse1 c_main_~X~0)) (= (mod .cse2 c_main_~Y~0) 0) (= c_main_~xy~0 (* c_main_~y~0 .cse1)) (<= .cse1 .cse3) (= c_main_~yx~0 (* c_main_~Y~0 .cse1)) .cse4)) (and (let ((.cse6 (= c_main_~y~0 0))) (or (let ((.cse5 (div c_main_~xy~0 c_main_~y~0))) (and (<= .cse5 .cse3) (= (mod c_main_~xy~0 c_main_~y~0) 0) (not .cse6) (< c_main_~X~0 .cse5))) (and .cse6 (= c_main_~xy~0 0)))) (= 0 .cse2) .cse0 (= c_main_~yx~0 0) .cse4))) (<= 0 c_main_~X~0)) is different from false [2022-03-20 14:08:33,570 WARN L232 SmtUtils]: Spent 5.42s on a formula simplification. DAG size of input: 3 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-03-20 14:09:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 28 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 14:09:05,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 14:09:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-20 14:09:06,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 14:09:06,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152693627] [2022-03-20 14:09:06,365 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 14:09:06,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101028741] [2022-03-20 14:09:06,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101028741] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 14:09:06,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 14:09:06,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 22 [2022-03-20 14:09:06,366 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 14:09:06,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1579685474] [2022-03-20 14:09:06,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1579685474] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 14:09:06,366 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 14:09:06,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 14:09:06,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978430116] [2022-03-20 14:09:06,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 14:09:06,367 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 14:09:06,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 14:09:06,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 14:09:06,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=347, Unknown=1, NotChecked=38, Total=462 [2022-03-20 14:09:06,367 INFO L87 Difference]: Start difference. First operand 132 states and 149 transitions. Second operand has 14 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:09:48,177 WARN L232 SmtUtils]: Spent 19.95s on a formula simplification. DAG size of input: 61 DAG size of output: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 14:09:50,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 14:09:50,351 INFO L93 Difference]: Finished difference Result 145 states and 161 transitions. [2022-03-20 14:09:50,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 14:09:50,351 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 49 [2022-03-20 14:09:50,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 14:09:50,352 INFO L225 Difference]: With dead ends: 145 [2022-03-20 14:09:50,352 INFO L226 Difference]: Without dead ends: 137 [2022-03-20 14:09:50,353 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 47.1s TimeCoverageRelationStatistics Valid=187, Invalid=737, Unknown=10, NotChecked=58, Total=992 [2022-03-20 14:09:50,353 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 14:09:50,353 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 105 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 99 Invalid, 0 Unknown, 47 Unchecked, 0.4s Time] [2022-03-20 14:09:50,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-03-20 14:09:50,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 120. [2022-03-20 14:09:50,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 93 states have (on average 1.118279569892473) internal successors, (104), 95 states have internal predecessors, (104), 14 states have call successors, (14), 13 states have call predecessors, (14), 12 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 14:09:50,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 130 transitions. [2022-03-20 14:09:50,373 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 130 transitions. Word has length 49 [2022-03-20 14:09:50,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 14:09:50,373 INFO L478 AbstractCegarLoop]: Abstraction has 120 states and 130 transitions. [2022-03-20 14:09:50,373 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:09:50,373 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 130 transitions. [2022-03-20 14:09:50,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 14:09:50,374 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 14:09:50,374 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 14:09:50,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 14:09:50,580 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 14:09:50,580 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 14:09:50,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 14:09:50,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1434541020, now seen corresponding path program 11 times [2022-03-20 14:09:50,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 14:09:50,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1178934607] [2022-03-20 14:09:50,583 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 14:09:50,583 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 14:09:50,583 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 14:09:50,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1434541020, now seen corresponding path program 12 times [2022-03-20 14:09:50,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 14:09:50,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412228696] [2022-03-20 14:09:50,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 14:09:50,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 14:09:50,589 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 14:09:50,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1225600809] [2022-03-20 14:09:50,589 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 14:09:50,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:09:50,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 14:09:50,590 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 14:09:50,591 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 14:09:50,928 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 14:09:50,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 14:09:50,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 14:09:50,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 14:09:52,003 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:09:52,004 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:09:52,008 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 14:09:55,796 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 32 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 14:09:55,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 14:09:56,772 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 39 proven. 2 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-03-20 14:09:56,772 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 14:09:56,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412228696] [2022-03-20 14:09:56,772 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 14:09:56,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225600809] [2022-03-20 14:09:56,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225600809] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 14:09:56,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 14:09:56,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 19 [2022-03-20 14:09:56,773 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 14:09:56,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1178934607] [2022-03-20 14:09:56,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1178934607] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 14:09:56,773 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 14:09:56,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 14:09:56,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629635350] [2022-03-20 14:09:56,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 14:09:56,773 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 14:09:56,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 14:09:56,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 14:09:56,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=292, Unknown=1, NotChecked=0, Total=342 [2022-03-20 14:09:56,774 INFO L87 Difference]: Start difference. First operand 120 states and 130 transitions. Second operand has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:09:59,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:01,143 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:05,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:07,352 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:11,539 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:13,586 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:42,690 WARN L232 SmtUtils]: Spent 26.86s on a formula simplification. DAG size of input: 67 DAG size of output: 58 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 14:10:45,005 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:46,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 14:10:46,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 14:10:46,926 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2022-03-20 14:10:46,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 14:10:46,926 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 52 [2022-03-20 14:10:46,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 14:10:46,927 INFO L225 Difference]: With dead ends: 137 [2022-03-20 14:10:46,927 INFO L226 Difference]: Without dead ends: 135 [2022-03-20 14:10:46,928 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 37.5s TimeCoverageRelationStatistics Valid=87, Invalid=462, Unknown=3, NotChecked=0, Total=552 [2022-03-20 14:10:46,928 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 17 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 6 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.8s IncrementalHoareTripleChecker+Time [2022-03-20 14:10:46,928 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 143 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 223 Invalid, 7 Unknown, 0 Unchecked, 16.8s Time] [2022-03-20 14:10:46,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-03-20 14:10:46,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 120. [2022-03-20 14:10:46,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 93 states have (on average 1.118279569892473) internal successors, (104), 95 states have internal predecessors, (104), 14 states have call successors, (14), 13 states have call predecessors, (14), 12 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 14:10:46,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 130 transitions. [2022-03-20 14:10:46,955 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 130 transitions. Word has length 52 [2022-03-20 14:10:46,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 14:10:46,956 INFO L478 AbstractCegarLoop]: Abstraction has 120 states and 130 transitions. [2022-03-20 14:10:46,956 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 13 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 14:10:46,956 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 130 transitions. [2022-03-20 14:10:46,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 14:10:46,956 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 14:10:46,956 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 14:10:46,973 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 14:10:47,157 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 14:10:47,157 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 14:10:47,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 14:10:47,157 INFO L85 PathProgramCache]: Analyzing trace with hash -1654553692, now seen corresponding path program 13 times [2022-03-20 14:10:47,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 14:10:47,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1385694188] [2022-03-20 14:10:47,160 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 14:10:47,160 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 14:10:47,160 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 14:10:47,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1654553692, now seen corresponding path program 14 times [2022-03-20 14:10:47,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 14:10:47,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199552231] [2022-03-20 14:10:47,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 14:10:47,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 14:10:47,177 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 14:10:47,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [353727104] [2022-03-20 14:10:47,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 14:10:47,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:10:47,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 14:10:47,179 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 14:10:47,182 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 14:10:47,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 14:10:47,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 14:10:47,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-20 14:10:47,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 14:10:49,658 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 18 proven. 50 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 14:10:49,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 14:10:51,338 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 39 proven. 2 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-03-20 14:10:51,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 14:10:51,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199552231] [2022-03-20 14:10:51,339 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 14:10:51,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353727104] [2022-03-20 14:10:51,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353727104] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 14:10:51,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 14:10:51,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12] total 25 [2022-03-20 14:10:51,339 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 14:10:51,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1385694188] [2022-03-20 14:10:51,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1385694188] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 14:10:51,339 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 14:10:51,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 14:10:51,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566213815] [2022-03-20 14:10:51,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 14:10:51,340 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 14:10:51,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 14:10:51,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 14:10:51,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2022-03-20 14:10:51,341 INFO L87 Difference]: Start difference. First operand 120 states and 130 transitions. Second operand has 18 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 14:10:53,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 14:10:53,575 INFO L93 Difference]: Finished difference Result 156 states and 172 transitions. [2022-03-20 14:10:53,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 14:10:53,576 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 52 [2022-03-20 14:10:53,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 14:10:53,577 INFO L225 Difference]: With dead ends: 156 [2022-03-20 14:10:53,577 INFO L226 Difference]: Without dead ends: 142 [2022-03-20 14:10:53,578 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=134, Invalid=678, Unknown=0, NotChecked=0, Total=812 [2022-03-20 14:10:53,578 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 14:10:53,579 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 326 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 14:10:53,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-20 14:10:53,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2022-03-20 14:10:53,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 109 states have (on average 1.1192660550458715) internal successors, (122), 111 states have internal predecessors, (122), 16 states have call successors, (16), 15 states have call predecessors, (16), 14 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 14:10:53,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 152 transitions. [2022-03-20 14:10:53,611 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 152 transitions. Word has length 52 [2022-03-20 14:10:53,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 14:10:53,611 INFO L478 AbstractCegarLoop]: Abstraction has 140 states and 152 transitions. [2022-03-20 14:10:53,611 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 14:10:53,611 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 152 transitions. [2022-03-20 14:10:53,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 14:10:53,612 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 14:10:53,612 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 14:10:53,628 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-20 14:10:53,819 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:10:53,819 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 14:10:53,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 14:10:53,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1831066978, now seen corresponding path program 15 times [2022-03-20 14:10:53,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 14:10:53,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [308193153] [2022-03-20 14:10:53,823 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 14:10:53,823 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 14:10:53,823 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 14:10:53,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1831066978, now seen corresponding path program 16 times [2022-03-20 14:10:53,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 14:10:53,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96056255] [2022-03-20 14:10:53,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 14:10:53,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 14:10:53,828 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 14:10:53,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [640372511] [2022-03-20 14:10:53,828 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 14:10:53,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 14:10:53,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 14:10:53,829 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 14:10:53,839 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 14:10:53,884 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 14:10:53,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 14:10:53,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-20 14:10:53,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 14:10:55,558 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful