/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 13:51:42,254 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 13:51:42,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 13:51:42,287 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 13:51:42,329 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 13:51:42,330 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 13:51:42,331 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 13:51:42,331 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 13:51:42,340 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 13:51:42,341 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 13:51:42,343 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 13:51:42,343 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 13:51:42,344 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 13:51:42,344 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:51:42,345 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 13:51:42,345 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 13:51:42,345 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 13:51:42,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 13:51:42,560 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 13:51:42,562 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 13:51:42,563 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 13:51:42,564 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 13:51:42,565 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c [2022-03-20 13:51:42,612 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a21c0775c/3ec60b73dd634915bf60499a63e0e860/FLAG31f6c3cf5 [2022-03-20 13:51:42,956 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 13:51:42,956 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c [2022-03-20 13:51:42,963 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a21c0775c/3ec60b73dd634915bf60499a63e0e860/FLAG31f6c3cf5 [2022-03-20 13:51:42,972 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a21c0775c/3ec60b73dd634915bf60499a63e0e860 [2022-03-20 13:51:42,974 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 13:51:42,975 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 13:51:42,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 13:51:42,977 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 13:51:42,980 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 13:51:42,980 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:51:42" (1/1) ... [2022-03-20 13:51:42,982 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19c277cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:42, skipping insertion in model container [2022-03-20 13:51:42,982 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:51:42" (1/1) ... [2022-03-20 13:51:42,986 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 13:51:42,997 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 13:51:43,113 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c[597,610] [2022-03-20 13:51:43,124 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:51:43,129 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 13:51:43,137 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_unwindbound10.c[597,610] [2022-03-20 13:51:43,141 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:51:43,150 INFO L208 MainTranslator]: Completed translation [2022-03-20 13:51:43,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43 WrapperNode [2022-03-20 13:51:43,150 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 13:51:43,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 13:51:43,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 13:51:43,151 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 13:51:43,160 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,175 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,178 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 13:51:43,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 13:51:43,180 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 13:51:43,180 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 13:51:43,181 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (1/1) ... [2022-03-20 13:51:43,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:51:43,198 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:43,209 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 13:51:43,217 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 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 13:51:43,238 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 13:51:43,239 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 13:51:43,239 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 13:51:43,239 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 13:51:43,239 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 13:51:43,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 13:51:43,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 13:51:43,285 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 13:51:43,286 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 13:51:43,406 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 13:51:43,410 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 13:51:43,411 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 13:51:43,414 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:51:43 BoogieIcfgContainer [2022-03-20 13:51:43,414 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 13:51:43,424 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 13:51:43,424 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 13:51:43,437 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 13:51:43,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 01:51:42" (1/3) ... [2022-03-20 13:51:43,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1fc86091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:51:43, skipping insertion in model container [2022-03-20 13:51:43,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:51:43" (2/3) ... [2022-03-20 13:51:43,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1fc86091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:51:43, skipping insertion in model container [2022-03-20 13:51:43,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:51:43" (3/3) ... [2022-03-20 13:51:43,439 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_unwindbound10.c [2022-03-20 13:51:43,443 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 13:51:43,443 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 13:51:43,486 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 13:51:43,494 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 13:51:43,494 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 13:51:43,510 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 13:51:43,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 13:51:43,526 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:43,526 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:51:43,527 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:43,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:43,531 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 1 times [2022-03-20 13:51:43,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:43,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [37796490] [2022-03-20 13:51:43,547 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:51:43,547 INFO L85 PathProgramCache]: Analyzing trace with hash 2019451875, now seen corresponding path program 2 times [2022-03-20 13:51:43,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:43,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651782997] [2022-03-20 13:51:43,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:43,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:43,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:51:43,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:51:43,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:51:43,735 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 13:51:43,735 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:43,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651782997] [2022-03-20 13:51:43,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651782997] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:43,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:43,737 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:51:43,738 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:43,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [37796490] [2022-03-20 13:51:43,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [37796490] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:43,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:43,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:51:43,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216804156] [2022-03-20 13:51:43,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:43,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 13:51:43,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:43,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 13:51:43,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 13:51:43,774 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 13:51:43,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:43,840 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2022-03-20 13:51:43,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 13:51:43,842 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 13:51:43,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:43,846 INFO L225 Difference]: With dead ends: 45 [2022-03-20 13:51:43,847 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 13:51:43,849 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 13:51:43,854 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 13:51:43,855 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 13:51:43,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 13:51:43,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-03-20 13:51:43,893 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 13:51:43,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-20 13:51:43,895 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 12 [2022-03-20 13:51:43,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:43,895 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-20 13:51:43,895 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 13:51:43,896 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-20 13:51:43,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 13:51:43,896 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:43,896 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:51:43,897 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 13:51:43,897 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:43,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:43,898 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 1 times [2022-03-20 13:51:43,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:43,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [617040103] [2022-03-20 13:51:43,899 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:51:43,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1431109416, now seen corresponding path program 2 times [2022-03-20 13:51:43,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:43,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132691458] [2022-03-20 13:51:43,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:43,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:43,915 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:43,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [84032589] [2022-03-20 13:51:43,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:51:43,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:43,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:43,918 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 13:51:43,919 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 13:51:43,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 13:51:43,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:43,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 13:51:43,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:44,067 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 13:51:44,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 13:51:44,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:44,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132691458] [2022-03-20 13:51:44,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:51:44,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84032589] [2022-03-20 13:51:44,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84032589] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:44,069 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:44,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:51:44,070 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:44,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [617040103] [2022-03-20 13:51:44,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [617040103] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:44,071 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:44,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:51:44,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93558878] [2022-03-20 13:51:44,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:44,075 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 13:51:44,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:44,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 13:51:44,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 13:51:44,081 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 13:51:44,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:44,143 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-03-20 13:51:44,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 13:51:44,144 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 13:51:44,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:44,145 INFO L225 Difference]: With dead ends: 34 [2022-03-20 13:51:44,145 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 13:51:44,146 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 13:51:44,146 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 13:51:44,147 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 13:51:44,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 13:51:44,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-03-20 13:51:44,152 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 13:51:44,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-03-20 13:51:44,153 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 12 [2022-03-20 13:51:44,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:44,153 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-03-20 13:51:44,153 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 13:51:44,153 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-03-20 13:51:44,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 13:51:44,154 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:44,154 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 13:51:44,171 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-20 13:51:44,367 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 13:51:44,368 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:44,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:44,368 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 1 times [2022-03-20 13:51:44,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:44,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1160173328] [2022-03-20 13:51:44,388 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:51:44,388 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:51:44,388 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:51:44,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1603905768, now seen corresponding path program 2 times [2022-03-20 13:51:44,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:44,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434469151] [2022-03-20 13:51:44,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:44,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:44,411 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:44,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [710807756] [2022-03-20 13:51:44,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:51:44,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:44,422 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:44,423 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 13:51:44,432 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 13:51:44,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:51:44,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:44,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 13:51:44,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:44,644 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 13:51:44,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:51:44,782 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 13:51:44,782 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:44,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434469151] [2022-03-20 13:51:44,782 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:51:44,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710807756] [2022-03-20 13:51:44,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710807756] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:51:44,783 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:51:44,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-03-20 13:51:44,783 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:44,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1160173328] [2022-03-20 13:51:44,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1160173328] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:44,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:44,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 13:51:44,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014090628] [2022-03-20 13:51:44,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:44,786 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 13:51:44,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:44,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 13:51:44,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 13:51:44,787 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 13:51:44,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:44,888 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-03-20 13:51:44,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:51:44,889 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 13:51:44,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:44,891 INFO L225 Difference]: With dead ends: 44 [2022-03-20 13:51:44,892 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 13:51:44,894 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 13:51:44,901 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 13:51:44,902 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 13:51:44,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 13:51:44,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-03-20 13:51:44,907 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 13:51:44,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-03-20 13:51:44,908 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 22 [2022-03-20 13:51:44,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:44,908 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-03-20 13:51:44,908 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 13:51:44,909 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-03-20 13:51:44,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 13:51:44,909 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:44,909 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 13:51:44,929 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-20 13:51:45,127 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 13:51:45,128 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:45,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:45,128 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 1 times [2022-03-20 13:51:45,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:45,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [810465834] [2022-03-20 13:51:45,132 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:51:45,132 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:51:45,132 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:51:45,132 INFO L85 PathProgramCache]: Analyzing trace with hash 794559142, now seen corresponding path program 2 times [2022-03-20 13:51:45,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:45,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126507087] [2022-03-20 13:51:45,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:45,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:45,140 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:45,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1444005885] [2022-03-20 13:51:45,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:51:45,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:45,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:45,142 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 13:51:45,143 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 13:51:45,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:51:45,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:45,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:51:45,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:45,321 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 13:51:45,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:51:45,427 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 13:51:45,428 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:45,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126507087] [2022-03-20 13:51:45,431 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:51:45,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444005885] [2022-03-20 13:51:45,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444005885] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:51:45,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:51:45,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-03-20 13:51:45,433 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:45,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [810465834] [2022-03-20 13:51:45,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [810465834] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:45,435 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:45,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 13:51:45,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433484159] [2022-03-20 13:51:45,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:45,435 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 13:51:45,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:45,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 13:51:45,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-03-20 13:51:45,436 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 13:51:45,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:45,534 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2022-03-20 13:51:45,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:51:45,534 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 13:51:45,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:45,535 INFO L225 Difference]: With dead ends: 53 [2022-03-20 13:51:45,535 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 13:51:45,536 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 13:51:45,540 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 13:51:45,541 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 13:51:45,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 13:51:45,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2022-03-20 13:51:45,556 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 13:51:45,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-20 13:51:45,559 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 22 [2022-03-20 13:51:45,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:45,559 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-20 13:51:45,559 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 13:51:45,560 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-20 13:51:45,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 13:51:45,561 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:45,561 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 13:51:45,581 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 13:51:45,771 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 13:51:45,772 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:45,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:45,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 1 times [2022-03-20 13:51:45,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:45,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1634616209] [2022-03-20 13:51:45,775 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:51:45,775 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:51:45,775 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:51:45,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1213814707, now seen corresponding path program 2 times [2022-03-20 13:51:45,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:45,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857294234] [2022-03-20 13:51:45,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:45,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:45,782 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:45,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [243778566] [2022-03-20 13:51:45,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:51:45,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:45,783 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:45,788 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 13:51:45,789 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 13:51:45,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:51:45,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:45,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 13:51:45,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:45,881 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 13:51:45,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:51:45,935 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 13:51:45,935 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:45,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857294234] [2022-03-20 13:51:45,935 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:51:45,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243778566] [2022-03-20 13:51:45,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243778566] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:51:45,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:51:45,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-20 13:51:45,936 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:45,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1634616209] [2022-03-20 13:51:45,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1634616209] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:45,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:45,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:51:45,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511155254] [2022-03-20 13:51:45,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:45,936 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 13:51:45,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:45,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 13:51:45,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-03-20 13:51:45,937 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 13:51:45,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:45,961 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-20 13:51:45,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 13:51:45,962 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 13:51:45,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:45,966 INFO L225 Difference]: With dead ends: 54 [2022-03-20 13:51:45,966 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 13:51:45,966 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 13:51:45,966 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 13:51:45,967 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 13:51:45,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 13:51:45,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 13:51:45,977 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 13:51:45,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-03-20 13:51:45,979 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 23 [2022-03-20 13:51:45,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:45,980 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-03-20 13:51:45,980 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 13:51:45,980 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-03-20 13:51:45,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 13:51:45,980 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:45,981 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 13:51:45,998 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 13:51:46,197 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 13:51:46,198 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:46,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:46,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 1 times [2022-03-20 13:51:46,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:46,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [280997804] [2022-03-20 13:51:46,201 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 6 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:51:46,201 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:51:46,202 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:51:46,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1132431350, now seen corresponding path program 2 times [2022-03-20 13:51:46,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:46,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170275028] [2022-03-20 13:51:46,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:46,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:46,208 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:46,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1184312129] [2022-03-20 13:51:46,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:51:46,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:46,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:46,210 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 13:51:46,211 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 13:51:46,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:51:46,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:46,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 13:51:46,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:46,471 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 13:51:46,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:51:46,801 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 13:51:46,801 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:51:46,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170275028] [2022-03-20 13:51:46,801 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:51:46,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184312129] [2022-03-20 13:51:46,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184312129] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:51:46,802 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:51:46,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2022-03-20 13:51:46,802 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:51:46,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [280997804] [2022-03-20 13:51:46,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [280997804] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:51:46,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:51:46,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:51:46,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890902079] [2022-03-20 13:51:46,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:51:46,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 13:51:46,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:46,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 13:51:46,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-03-20 13:51:46,803 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 13:51:46,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:51:46,998 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2022-03-20 13:51:46,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 13:51:46,998 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 13:51:46,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:51:46,999 INFO L225 Difference]: With dead ends: 57 [2022-03-20 13:51:46,999 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 13:51:47,000 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-03-20 13:51:47,000 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 13:51:47,000 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 13:51:47,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 13:51:47,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38. [2022-03-20 13:51:47,005 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 13:51:47,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-03-20 13:51:47,005 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2022-03-20 13:51:47,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:51:47,005 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-03-20 13:51:47,005 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 13:51:47,006 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-03-20 13:51:47,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 13:51:47,006 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:51:47,006 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 13:51:47,027 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 13:51:47,209 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 13:51:47,210 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:51:47,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:51:47,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 3 times [2022-03-20 13:51:47,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:51:47,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1502246573] [2022-03-20 13:51:47,213 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:51:47,213 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:51:47,213 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:51:47,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1603460440, now seen corresponding path program 4 times [2022-03-20 13:51:47,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:51:47,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859213043] [2022-03-20 13:51:47,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:51:47,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:51:47,220 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:51:47,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1995913486] [2022-03-20 13:51:47,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:51:47,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:51:47,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:51:47,222 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 13:51:47,223 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 13:51:47,254 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:51:47,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:51:47,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 13:51:47,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:51:47,309 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:52:08,549 WARN L232 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:52:34,610 WARN L232 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:52:58,669 WARN L232 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 29 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:53:02,699 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:53:02,702 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:53:02,707 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:53:02,711 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:53:40,646 WARN L232 SmtUtils]: Spent 22.92s on a formula simplification that was a NOOP. DAG size: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:53:43,182 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 10 proven. 4 refuted. 2 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:53:43,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:53:43,818 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 13:53:43,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:53:43,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859213043] [2022-03-20 13:53:43,819 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:53:43,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995913486] [2022-03-20 13:53:43,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995913486] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:53:43,819 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:53:43,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 18 [2022-03-20 13:53:43,819 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:53:43,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1502246573] [2022-03-20 13:53:43,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1502246573] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:53:43,820 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:53:43,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 13:53:43,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755531888] [2022-03-20 13:53:43,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:53:43,820 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 13:53:43,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:53:43,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 13:53:43,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=236, Unknown=21, NotChecked=0, Total=306 [2022-03-20 13:53:43,821 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:54:16,360 WARN L232 SmtUtils]: Spent 24.12s on a formula simplification. DAG size of input: 40 DAG size of output: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:56:00,367 WARN L232 SmtUtils]: Spent 1.62m on a formula simplification. DAG size of input: 104 DAG size of output: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:56:01,532 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:56:35,984 WARN L232 SmtUtils]: Spent 28.25s on a formula simplification. DAG size of input: 57 DAG size of output: 38 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:56:38,043 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:56:48,190 WARN L232 SmtUtils]: Spent 6.11s on a formula simplification that was a NOOP. DAG size: 32 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:56:50,223 WARN L534 Checker$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 13:56:51,685 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:56:53,709 WARN L534 Checker$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 13:57:02,682 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:04,685 WARN L534 Checker$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 13:57:06,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:08,704 WARN L534 Checker$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 13:57:34,879 WARN L232 SmtUtils]: Spent 16.10s on a formula simplification. DAG size of input: 45 DAG size of output: 32 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 13:57:36,887 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:38,908 WARN L534 Checker$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 13:57:40,491 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:42,495 WARN L534 Checker$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 13:57:44,537 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:46,570 WARN L534 Checker$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 13:57:48,632 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 13:57:48,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:48,633 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2022-03-20 13:57:48,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 13:57:48,635 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2022-03-20 13:57:48,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:48,636 INFO L225 Difference]: With dead ends: 60 [2022-03-20 13:57:48,636 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 13:57:48,636 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 301.6s TimeCoverageRelationStatistics Valid=110, Invalid=454, Unknown=36, NotChecked=0, Total=600 [2022-03-20 13:57:48,636 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 20 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 30.6s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:48,637 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 94 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 82 Invalid, 13 Unknown, 21 Unchecked, 30.6s Time] [2022-03-20 13:57:48,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 13:57:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2022-03-20 13:57:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:48,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-03-20 13:57:48,645 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2022-03-20 13:57:48,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:48,645 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-03-20 13:57:48,645 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 1.75) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:57:48,645 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-03-20 13:57:48,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 13:57:48,646 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:48,646 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:57:48,663 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-20 13:57:48,846 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 13:57:48,847 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:48,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:48,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1756989579, now seen corresponding path program 1 times [2022-03-20 13:57:48,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:48,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1057116335] [2022-03-20 13:57:48,849 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:48,849 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:48,849 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:48,849 INFO L85 PathProgramCache]: Analyzing trace with hash 1756989579, now seen corresponding path program 2 times [2022-03-20 13:57:48,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:48,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905073883] [2022-03-20 13:57:48,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:48,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:48,866 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:48,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [584112661] [2022-03-20 13:57:48,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:57:48,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:48,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:48,868 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 13:57:48,868 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 13:57:48,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:57:48,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:48,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 13:57:48,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:48,958 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 13:57:48,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:49,026 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 13:57:49,026 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:49,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905073883] [2022-03-20 13:57:49,026 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:49,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584112661] [2022-03-20 13:57:49,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584112661] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:49,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:49,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-03-20 13:57:49,027 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:49,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1057116335] [2022-03-20 13:57:49,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1057116335] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:49,027 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:49,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:57:49,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727281773] [2022-03-20 13:57:49,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:49,028 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 13:57:49,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:49,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 13:57:49,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-03-20 13:57:49,028 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:57:49,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:57:49,065 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-03-20 13:57:49,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:57:49,065 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 13:57:49,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:57:49,066 INFO L225 Difference]: With dead ends: 50 [2022-03-20 13:57:49,066 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 13:57:49,066 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 13:57:49,066 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:57:49,067 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 75 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:57:49,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 13:57:49,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-20 13:57:49,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:57:49,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2022-03-20 13:57:49,073 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2022-03-20 13:57:49,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:57:49,074 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2022-03-20 13:57:49,074 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 13:57:49,074 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2022-03-20 13:57:49,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:57:49,074 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:57:49,074 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 13:57:49,091 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 13:57:49,287 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 13:57:49,289 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:57:49,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:57:49,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1565736524, now seen corresponding path program 1 times [2022-03-20 13:57:49,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:49,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1318261090] [2022-03-20 13:57:49,292 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:57:49,292 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:57:49,292 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:57:49,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1565736524, now seen corresponding path program 2 times [2022-03-20 13:57:49,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:57:49,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837148768] [2022-03-20 13:57:49,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:57:49,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:57:49,297 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:57:49,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [814456523] [2022-03-20 13:57:49,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:57:49,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:57:49,298 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:57:49,299 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 13:57:49,308 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 13:57:49,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:57:49,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:57:49,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 13:57:49,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:57:49,413 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:49,414 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:57:49,705 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:57:49,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:57:49,835 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 13:57:49,835 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:57:49,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837148768] [2022-03-20 13:57:49,835 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:57:49,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814456523] [2022-03-20 13:57:49,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814456523] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:57:49,836 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:57:49,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2022-03-20 13:57:49,836 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:57:49,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1318261090] [2022-03-20 13:57:49,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1318261090] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:57:49,836 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:57:49,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 13:57:49,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060621109] [2022-03-20 13:57:49,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:57:49,836 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 13:57:49,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:57:49,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 13:57:49,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 13:57:49,837 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:57:51,845 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 13:57:55,873 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:57:57,878 WARN L534 Checker$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 13:57:59,883 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 13:58:01,908 WARN L534 Checker$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 13:58:03,922 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 13:58:06,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:58:06,155 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2022-03-20 13:58:06,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 13:58:06,155 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2022-03-20 13:58:06,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:58:06,156 INFO L225 Difference]: With dead ends: 67 [2022-03-20 13:58:06,156 INFO L226 Difference]: Without dead ends: 61 [2022-03-20 13:58:06,156 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=66, Invalid=238, Unknown=2, NotChecked=0, Total=306 [2022-03-20 13:58:06,157 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:58:06,157 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 100 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 6 Unknown, 0 Unchecked, 12.1s Time] [2022-03-20 13:58:06,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-20 13:58:06,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2022-03-20 13:58:06,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 states have internal predecessors, (54), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 13:58:06,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2022-03-20 13:58:06,167 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 39 [2022-03-20 13:58:06,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:58:06,167 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2022-03-20 13:58:06,167 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 13:58:06,168 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2022-03-20 13:58:06,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:58:06,169 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:58:06,169 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:58:06,195 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 13:58:06,369 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 13:58:06,370 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:58:06,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:58:06,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1449367094, now seen corresponding path program 1 times [2022-03-20 13:58:06,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:58:06,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1516776828] [2022-03-20 13:58:06,373 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:58:06,373 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:58:06,373 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:58:06,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1449367094, now seen corresponding path program 2 times [2022-03-20 13:58:06,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:58:06,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942210317] [2022-03-20 13:58:06,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:58:06,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:58:06,388 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:58:06,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [261427433] [2022-03-20 13:58:06,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:58:06,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:58:06,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:58:06,394 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 13:58:06,395 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 13:58:06,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:58:06,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:58:06,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 13:58:06,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:58:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 13:58:06,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:58:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 13:58:06,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:58:06,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942210317] [2022-03-20 13:58:06,711 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:58:06,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261427433] [2022-03-20 13:58:06,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261427433] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:58:06,712 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 13:58:06,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-03-20 13:58:06,712 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:58:06,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1516776828] [2022-03-20 13:58:06,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1516776828] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:58:06,712 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:58:06,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 13:58:06,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380387820] [2022-03-20 13:58:06,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:58:06,712 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 13:58:06,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:58:06,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 13:58:06,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-20 13:58:06,713 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:58:06,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:58:06,767 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-03-20 13:58:06,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 13:58:06,767 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2022-03-20 13:58:06,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:58:06,768 INFO L225 Difference]: With dead ends: 72 [2022-03-20 13:58:06,768 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 13:58:06,768 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-03-20 13:58:06,768 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:58:06,769 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 101 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:58:06,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 13:58:06,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 13:58:06,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 9 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 13:58:06,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2022-03-20 13:58:06,781 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 39 [2022-03-20 13:58:06,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:58:06,781 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2022-03-20 13:58:06,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 13:58:06,781 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2022-03-20 13:58:06,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:58:06,782 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:58:06,782 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:58:06,805 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 13:58:06,999 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 13:58:07,000 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:58:07,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:58:07,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1425187914, now seen corresponding path program 3 times [2022-03-20 13:58:07,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:58:07,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1998229126] [2022-03-20 13:58:07,003 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 5 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:58:07,003 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-03-20 13:58:07,004 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:58:07,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1425187914, now seen corresponding path program 4 times [2022-03-20 13:58:07,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:58:07,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328005746] [2022-03-20 13:58:07,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:58:07,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:58:07,015 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:58:07,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [978527209] [2022-03-20 13:58:07,016 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:58:07,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:58:07,018 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:58:07,019 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 13:58:07,020 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 13:58:07,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:58:07,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:58:07,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-20 13:58:07,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:58:08,518 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:58:08,522 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 13:58:08,524 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful