/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/hard2_valuebound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 15:54:32,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 15:54:32,363 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 15:54:32,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-20 15:54:32,386 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-20 15:54:32,386 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-20 15:54:32,391 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-20 15:54:32,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-20 15:54:32,397 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-20 15:54:32,401 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-20 15:54:32,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-20 15:54:32,402 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-20 15:54:32,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 15:54:32,404 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 15:54:32,405 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 15:54:32,407 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 15:54:32,407 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 15:54:32,407 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 15:54:32,412 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 15:54:32,413 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 15:54:32,413 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 15:54:32,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 15:54:32,415 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 15:54:32,416 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 15:54:32,417 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 15:54:32,424 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-20 15:54:32,424 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-20 15:54:32,424 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-20 15:54:32,425 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-20 15:54:32,425 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-20 15:54:32,425 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-20 15:54:32,425 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-20 15:54:32,426 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-20 15:54:32,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-20 15:54:32,427 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-20 15:54:32,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-20 15:54:32,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-20 15:54:32,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-20 15:54:32,428 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-20 15:54:32,428 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 15:54:32,428 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 15:54:32,432 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 15:54:32,433 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 15:54:32,441 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 15:54:32,442 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 15:54:32,444 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 15:54:32,444 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 15:54:32,444 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 15:54:32,445 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 15:54:32,445 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 15:54:32,445 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 15:54:32,445 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 15:54:32,445 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 15:54:32,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 15:54:32,446 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 15:54:32,446 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 15:54:32,447 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 15:54:32,447 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 15:54:32,447 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 15:54:32,447 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 15:54:32,598 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 15:54:32,614 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 15:54:32,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 15:54:32,617 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 15:54:32,618 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 15:54:32,619 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_valuebound100.c [2022-03-20 15:54:32,675 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7a0782e/c2db4563020a41049873b933ab0375de/FLAGec0ec3231 [2022-03-20 15:54:33,012 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 15:54:33,013 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_valuebound100.c [2022-03-20 15:54:33,017 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7a0782e/c2db4563020a41049873b933ab0375de/FLAGec0ec3231 [2022-03-20 15:54:33,026 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7a0782e/c2db4563020a41049873b933ab0375de [2022-03-20 15:54:33,028 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 15:54:33,029 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 15:54:33,030 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 15:54:33,030 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 15:54:33,032 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 15:54:33,032 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,033 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7845ccb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33, skipping insertion in model container [2022-03-20 15:54:33,033 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,038 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 15:54:33,047 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 15:54:33,165 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/hard2_valuebound100.c[526,539] [2022-03-20 15:54:33,175 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 15:54:33,187 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 15:54:33,195 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/hard2_valuebound100.c[526,539] [2022-03-20 15:54:33,199 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 15:54:33,207 INFO L208 MainTranslator]: Completed translation [2022-03-20 15:54:33,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33 WrapperNode [2022-03-20 15:54:33,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 15:54:33,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 15:54:33,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 15:54:33,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 15:54:33,215 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,219 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,220 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,223 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,227 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,228 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,229 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 15:54:33,230 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 15:54:33,230 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 15:54:33,230 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 15:54:33,230 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (1/1) ... [2022-03-20 15:54:33,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 15:54:33,257 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:33,270 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 15:54:33,291 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 15:54:33,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 15:54:33,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 15:54:33,303 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 15:54:33,303 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 15:54:33,303 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 15:54:33,303 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 15:54:33,303 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 15:54:33,303 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 15:54:33,303 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 15:54:33,304 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 15:54:33,304 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 15:54:33,304 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 15:54:33,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 15:54:33,354 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 15:54:33,355 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 15:54:33,442 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 15:54:33,446 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 15:54:33,447 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 15:54:33,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 03:54:33 BoogieIcfgContainer [2022-03-20 15:54:33,448 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 15:54:33,449 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 15:54:33,449 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 15:54:33,451 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 15:54:33,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 03:54:33" (1/3) ... [2022-03-20 15:54:33,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7d32e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 03:54:33, skipping insertion in model container [2022-03-20 15:54:33,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 03:54:33" (2/3) ... [2022-03-20 15:54:33,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7d32e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 03:54:33, skipping insertion in model container [2022-03-20 15:54:33,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 03:54:33" (3/3) ... [2022-03-20 15:54:33,453 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_valuebound100.c [2022-03-20 15:54:33,457 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 15:54:33,457 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 15:54:33,487 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 15:54:33,491 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 15:54:33,491 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 15:54:33,501 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 15:54:33,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 15:54:33,507 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:33,508 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:33,508 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:33,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:33,512 INFO L85 PathProgramCache]: Analyzing trace with hash -977830905, now seen corresponding path program 1 times [2022-03-20 15:54:33,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:33,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [172505818] [2022-03-20 15:54:33,525 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 15:54:33,525 INFO L85 PathProgramCache]: Analyzing trace with hash -977830905, now seen corresponding path program 2 times [2022-03-20 15:54:33,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:33,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307536095] [2022-03-20 15:54:33,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:33,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:33,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 15:54:33,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,659 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 15:54:33,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,665 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 15:54:33,665 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:33,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307536095] [2022-03-20 15:54:33,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307536095] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:33,666 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:33,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 15:54:33,668 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:33,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [172505818] [2022-03-20 15:54:33,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [172505818] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:33,669 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:33,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 15:54:33,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060784673] [2022-03-20 15:54:33,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:33,673 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 15:54:33,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:33,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 15:54:33,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 15:54:33,694 INFO L87 Difference]: Start difference. First operand has 35 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 15:54:33,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:33,755 INFO L93 Difference]: Finished difference Result 61 states and 95 transitions. [2022-03-20 15:54:33,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 15:54:33,757 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-20 15:54:33,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:33,762 INFO L225 Difference]: With dead ends: 61 [2022-03-20 15:54:33,763 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 15:54:33,765 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 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 15:54:33,767 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:33,768 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 38 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 15:54:33,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 15:54:33,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 15:54:33,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 15:54:33,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2022-03-20 15:54:33,797 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 17 [2022-03-20 15:54:33,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:33,798 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2022-03-20 15:54:33,798 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 15:54:33,798 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2022-03-20 15:54:33,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 15:54:33,798 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:33,798 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:33,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 15:54:33,799 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:33,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:33,799 INFO L85 PathProgramCache]: Analyzing trace with hash -297772535, now seen corresponding path program 1 times [2022-03-20 15:54:33,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:33,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2086259530] [2022-03-20 15:54:33,800 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 15:54:33,800 INFO L85 PathProgramCache]: Analyzing trace with hash -297772535, now seen corresponding path program 2 times [2022-03-20 15:54:33,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:33,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546645072] [2022-03-20 15:54:33,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:33,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:33,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 15:54:33,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 15:54:33,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:33,870 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 15:54:33,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:33,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546645072] [2022-03-20 15:54:33,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546645072] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:33,871 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:33,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:54:33,871 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:33,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2086259530] [2022-03-20 15:54:33,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2086259530] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:33,872 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:33,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:54:33,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500128044] [2022-03-20 15:54:33,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:33,873 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 15:54:33,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:33,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 15:54:33,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:54:33,873 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 15:54:34,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:34,002 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-03-20 15:54:34,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 15:54:34,002 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-20 15:54:34,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:34,003 INFO L225 Difference]: With dead ends: 43 [2022-03-20 15:54:34,004 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 15:54:34,004 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 15:54:34,005 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 37 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:34,006 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 45 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:54:34,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 15:54:34,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2022-03-20 15:54:34,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 15:54:34,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2022-03-20 15:54:34,015 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 17 [2022-03-20 15:54:34,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:34,016 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2022-03-20 15:54:34,016 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 15:54:34,016 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2022-03-20 15:54:34,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 15:54:34,016 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:34,016 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:34,017 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 15:54:34,017 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:34,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:34,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1294462534, now seen corresponding path program 1 times [2022-03-20 15:54:34,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [993849303] [2022-03-20 15:54:34,018 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 15:54:34,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1294462534, now seen corresponding path program 2 times [2022-03-20 15:54:34,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:34,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252626229] [2022-03-20 15:54:34,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:34,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:34,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:34,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 15:54:34,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:34,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 15:54:34,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:34,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2022-03-20 15:54:34,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 15:54:34,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 15:54:34,078 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:34,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252626229] [2022-03-20 15:54:34,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252626229] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,078 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:54:34,078 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:34,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [993849303] [2022-03-20 15:54:34,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [993849303] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,079 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:54:34,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908202049] [2022-03-20 15:54:34,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:34,079 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 15:54:34,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 15:54:34,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:54:34,080 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 15:54:34,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:34,217 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2022-03-20 15:54:34,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 15:54:34,217 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2022-03-20 15:54:34,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:34,220 INFO L225 Difference]: With dead ends: 47 [2022-03-20 15:54:34,220 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 15:54:34,220 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 15:54:34,223 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 32 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:34,227 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 45 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:54:34,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 15:54:34,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2022-03-20 15:54:34,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 15:54:34,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-03-20 15:54:34,248 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 22 [2022-03-20 15:54:34,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:34,248 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-03-20 15:54:34,249 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 15:54:34,249 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-03-20 15:54:34,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 15:54:34,250 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:34,250 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:34,250 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 15:54:34,251 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:34,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:34,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1449027479, now seen corresponding path program 1 times [2022-03-20 15:54:34,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [53670559] [2022-03-20 15:54:34,255 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 15:54:34,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1449027479, now seen corresponding path program 2 times [2022-03-20 15:54:34,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:34,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517285505] [2022-03-20 15:54:34,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:34,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:34,278 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:34,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1826495693] [2022-03-20 15:54:34,279 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:54:34,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:34,279 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:34,280 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 15:54:34,282 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 15:54:34,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:54:34,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:34,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 15:54:34,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:34,482 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 15:54:34,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 15:54:34,482 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:34,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517285505] [2022-03-20 15:54:34,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:34,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826495693] [2022-03-20 15:54:34,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826495693] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,483 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 15:54:34,484 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:34,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [53670559] [2022-03-20 15:54:34,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [53670559] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 15:54:34,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760503271] [2022-03-20 15:54:34,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:34,486 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 15:54:34,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 15:54:34,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 15:54:34,487 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 15:54:34,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:34,534 INFO L93 Difference]: Finished difference Result 66 states and 84 transitions. [2022-03-20 15:54:34,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 15:54:34,536 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2022-03-20 15:54:34,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:34,539 INFO L225 Difference]: With dead ends: 66 [2022-03-20 15:54:34,540 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 15:54:34,546 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:54:34,550 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 8 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:34,550 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 138 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 15:54:34,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 15:54:34,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-03-20 15:54:34,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 31 states have internal predecessors, (34), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 15:54:34,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 63 transitions. [2022-03-20 15:54:34,558 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 63 transitions. Word has length 27 [2022-03-20 15:54:34,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:34,558 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 63 transitions. [2022-03-20 15:54:34,558 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 15:54:34,558 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 63 transitions. [2022-03-20 15:54:34,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 15:54:34,559 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:34,559 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:34,578 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 15:54:34,765 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:34,766 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:34,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:34,766 INFO L85 PathProgramCache]: Analyzing trace with hash 905213191, now seen corresponding path program 1 times [2022-03-20 15:54:34,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1888499171] [2022-03-20 15:54:34,767 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 15:54:34,767 INFO L85 PathProgramCache]: Analyzing trace with hash 905213191, now seen corresponding path program 2 times [2022-03-20 15:54:34,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:34,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957054165] [2022-03-20 15:54:34,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:34,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:34,783 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:34,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977325621] [2022-03-20 15:54:34,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:54:34,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:34,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:34,785 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 15:54:34,787 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 15:54:34,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:54:34,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:34,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 15:54:34,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:34,921 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 15:54:34,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 15:54:34,922 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:34,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957054165] [2022-03-20 15:54:34,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:34,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977325621] [2022-03-20 15:54:34,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977325621] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,922 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 15:54:34,923 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:34,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1888499171] [2022-03-20 15:54:34,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1888499171] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:34,923 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:34,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 15:54:34,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646064043] [2022-03-20 15:54:34,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:34,924 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 15:54:34,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:34,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 15:54:34,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 15:54:34,924 INFO L87 Difference]: Start difference. First operand 52 states and 63 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 15:54:34,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:34,965 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2022-03-20 15:54:34,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 15:54:34,965 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2022-03-20 15:54:34,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:34,966 INFO L225 Difference]: With dead ends: 65 [2022-03-20 15:54:34,966 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 15:54:34,966 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:54:34,967 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 9 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:34,967 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 15:54:34,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 15:54:34,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2022-03-20 15:54:34,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 35 states have internal predecessors, (39), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 15:54:34,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 69 transitions. [2022-03-20 15:54:34,974 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 69 transitions. Word has length 34 [2022-03-20 15:54:34,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:34,975 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 69 transitions. [2022-03-20 15:54:34,975 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 15:54:34,975 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 69 transitions. [2022-03-20 15:54:34,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 15:54:34,976 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:34,976 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:34,997 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 15:54:35,195 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:35,195 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:35,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:35,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1576096488, now seen corresponding path program 1 times [2022-03-20 15:54:35,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:35,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [305214263] [2022-03-20 15:54:35,213 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:54:35,213 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:54:35,213 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:54:35,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1576096488, now seen corresponding path program 2 times [2022-03-20 15:54:35,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:35,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918800628] [2022-03-20 15:54:35,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:35,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:35,222 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:35,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1724928804] [2022-03-20 15:54:35,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:54:35,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:35,222 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:35,223 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 15:54:35,224 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 15:54:35,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:54:35,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:35,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 15:54:35,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:35,417 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-20 15:54:35,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:54:35,528 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-03-20 15:54:35,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:35,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918800628] [2022-03-20 15:54:35,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:35,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724928804] [2022-03-20 15:54:35,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724928804] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 15:54:35,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 15:54:35,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-03-20 15:54:35,529 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:35,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [305214263] [2022-03-20 15:54:35,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [305214263] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:35,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:35,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 15:54:35,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923515972] [2022-03-20 15:54:35,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:35,530 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 15:54:35,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:35,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 15:54:35,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-20 15:54:35,531 INFO L87 Difference]: Start difference. First operand 57 states and 69 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 15:54:35,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:35,566 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2022-03-20 15:54:35,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 15:54:35,566 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2022-03-20 15:54:35,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:35,568 INFO L225 Difference]: With dead ends: 69 [2022-03-20 15:54:35,568 INFO L226 Difference]: Without dead ends: 67 [2022-03-20 15:54:35,569 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 15:54:35,569 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:35,569 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 122 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 15:54:35,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-20 15:54:35,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2022-03-20 15:54:35,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 37 states have (on average 1.162162162162162) internal successors, (43), 40 states have internal predecessors, (43), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 15:54:35,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2022-03-20 15:54:35,578 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 44 [2022-03-20 15:54:35,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:35,578 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2022-03-20 15:54:35,578 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 15:54:35,578 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2022-03-20 15:54:35,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-03-20 15:54:35,579 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:35,579 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:35,599 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 15:54:35,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:35,788 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:35,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:35,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1615471943, now seen corresponding path program 1 times [2022-03-20 15:54:35,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:35,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1882137867] [2022-03-20 15:54:35,792 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:54:35,792 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:54:35,792 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:54:35,792 INFO L85 PathProgramCache]: Analyzing trace with hash 1615471943, now seen corresponding path program 2 times [2022-03-20 15:54:35,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:35,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822421644] [2022-03-20 15:54:35,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:35,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:35,801 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:35,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1781748240] [2022-03-20 15:54:35,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:54:35,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:35,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:35,802 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 15:54:35,804 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 15:54:35,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:54:35,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:35,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 15:54:35,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:36,127 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-03-20 15:54:36,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:54:36,831 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-03-20 15:54:36,831 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:36,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822421644] [2022-03-20 15:54:36,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:36,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781748240] [2022-03-20 15:54:36,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781748240] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:54:36,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:54:36,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2022-03-20 15:54:36,832 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:36,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1882137867] [2022-03-20 15:54:36,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1882137867] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:36,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:36,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 15:54:36,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356857459] [2022-03-20 15:54:36,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:36,832 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 15:54:36,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:36,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 15:54:36,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 15:54:36,833 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-03-20 15:54:36,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:36,942 INFO L93 Difference]: Finished difference Result 130 states and 164 transitions. [2022-03-20 15:54:36,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 15:54:36,943 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 64 [2022-03-20 15:54:36,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:36,944 INFO L225 Difference]: With dead ends: 130 [2022-03-20 15:54:36,944 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 15:54:36,947 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 116 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2022-03-20 15:54:36,947 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 11 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:36,948 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 239 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:54:36,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 15:54:36,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2022-03-20 15:54:36,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 60 states have (on average 1.15) internal successors, (69), 63 states have internal predecessors, (69), 25 states have call successors, (25), 14 states have call predecessors, (25), 13 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 15:54:36,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2022-03-20 15:54:36,965 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 64 [2022-03-20 15:54:36,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:36,965 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2022-03-20 15:54:36,965 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-03-20 15:54:36,965 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2022-03-20 15:54:36,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 15:54:36,967 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:36,967 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:36,985 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 15:54:37,179 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:37,179 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:37,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:37,180 INFO L85 PathProgramCache]: Analyzing trace with hash -262609796, now seen corresponding path program 3 times [2022-03-20 15:54:37,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:37,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [852736324] [2022-03-20 15:54:37,183 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:54:37,183 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:54:37,183 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:54:37,183 INFO L85 PathProgramCache]: Analyzing trace with hash -262609796, now seen corresponding path program 4 times [2022-03-20 15:54:37,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:37,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412227409] [2022-03-20 15:54:37,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:37,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:37,194 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:37,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [764730613] [2022-03-20 15:54:37,195 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 15:54:37,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:37,195 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:37,201 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 15:54:37,202 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 15:54:37,242 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 15:54:37,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:37,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 15:54:37,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:37,409 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 15:54:37,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:54:38,420 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 15:54:38,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:38,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412227409] [2022-03-20 15:54:38,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:38,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764730613] [2022-03-20 15:54:38,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764730613] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:54:38,421 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:54:38,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-03-20 15:54:38,421 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:38,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [852736324] [2022-03-20 15:54:38,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [852736324] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:38,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:38,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:54:38,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378483799] [2022-03-20 15:54:38,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:38,422 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 15:54:38,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:38,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 15:54:38,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 15:54:38,422 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-03-20 15:54:38,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:38,519 INFO L93 Difference]: Finished difference Result 126 states and 151 transitions. [2022-03-20 15:54:38,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 15:54:38,520 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 69 [2022-03-20 15:54:38,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:38,521 INFO L225 Difference]: With dead ends: 126 [2022-03-20 15:54:38,521 INFO L226 Difference]: Without dead ends: 103 [2022-03-20 15:54:38,521 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-03-20 15:54:38,521 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:38,522 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 199 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:54:38,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-20 15:54:38,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-20 15:54:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 66 states have internal predecessors, (69), 26 states have call successors, (26), 15 states have call predecessors, (26), 14 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 15:54:38,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2022-03-20 15:54:38,542 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 69 [2022-03-20 15:54:38,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:38,543 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2022-03-20 15:54:38,543 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-03-20 15:54:38,543 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2022-03-20 15:54:38,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 15:54:38,551 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:38,551 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:38,571 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 15:54:38,755 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:38,756 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:38,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:38,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1554666020, now seen corresponding path program 1 times [2022-03-20 15:54:38,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:38,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [970783664] [2022-03-20 15:54:38,759 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:54:38,759 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:54:38,759 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:54:38,759 INFO L85 PathProgramCache]: Analyzing trace with hash -1554666020, now seen corresponding path program 2 times [2022-03-20 15:54:38,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:38,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737328482] [2022-03-20 15:54:38,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:38,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:38,766 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:38,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1189061511] [2022-03-20 15:54:38,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:54:38,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:38,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:38,768 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 15:54:38,769 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 15:54:38,806 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:54:38,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:38,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-20 15:54:38,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 30 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-03-20 15:54:39,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:54:39,388 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2022-03-20 15:54:39,389 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:54:39,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737328482] [2022-03-20 15:54:39,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:54:39,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189061511] [2022-03-20 15:54:39,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189061511] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:54:39,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:54:39,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2022-03-20 15:54:39,390 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:54:39,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [970783664] [2022-03-20 15:54:39,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [970783664] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:54:39,390 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:54:39,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 15:54:39,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845975932] [2022-03-20 15:54:39,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:54:39,390 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 15:54:39,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:39,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 15:54:39,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-03-20 15:54:39,391 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-03-20 15:54:39,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:54:39,572 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2022-03-20 15:54:39,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 15:54:39,573 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 75 [2022-03-20 15:54:39,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:54:39,575 INFO L225 Difference]: With dead ends: 109 [2022-03-20 15:54:39,575 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 15:54:39,576 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2022-03-20 15:54:39,577 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 16 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:54:39,578 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 207 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:54:39,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 15:54:39,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-20 15:54:39,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 48 states have (on average 1.125) internal successors, (54), 51 states have internal predecessors, (54), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 15:54:39,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 94 transitions. [2022-03-20 15:54:39,589 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 94 transitions. Word has length 75 [2022-03-20 15:54:39,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:54:39,589 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 94 transitions. [2022-03-20 15:54:39,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-03-20 15:54:39,589 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 94 transitions. [2022-03-20 15:54:39,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-20 15:54:39,590 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:54:39,590 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:54:39,612 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 15:54:39,793 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:39,794 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:54:39,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:54:39,794 INFO L85 PathProgramCache]: Analyzing trace with hash 330473976, now seen corresponding path program 5 times [2022-03-20 15:54:39,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:54:39,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [132570824] [2022-03-20 15:54:39,797 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:54:39,797 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:54:39,797 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:54:39,797 INFO L85 PathProgramCache]: Analyzing trace with hash 330473976, now seen corresponding path program 6 times [2022-03-20 15:54:39,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:54:39,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946081696] [2022-03-20 15:54:39,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:54:39,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:54:39,805 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:54:39,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1369246649] [2022-03-20 15:54:39,806 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 15:54:39,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:54:39,806 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:54:39,807 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 15:54:39,818 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 15:54:39,844 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 15:54:39,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:54:39,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 15:54:39,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:54:40,194 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2022-03-20 15:54:40,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:55:00,406 WARN L232 SmtUtils]: Spent 7.45s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 15:55:43,924 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 45 proven. 19 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2022-03-20 15:55:43,925 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:55:43,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946081696] [2022-03-20 15:55:43,925 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:55:43,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369246649] [2022-03-20 15:55:43,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369246649] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:55:43,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:55:43,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2022-03-20 15:55:43,927 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:55:43,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [132570824] [2022-03-20 15:55:43,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [132570824] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:55:43,927 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:55:43,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 15:55:43,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988695903] [2022-03-20 15:55:43,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:55:43,928 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 15:55:43,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:55:43,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 15:55:43,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 15:55:43,929 INFO L87 Difference]: Start difference. First operand 81 states and 94 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-03-20 15:55:44,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:55:44,104 INFO L93 Difference]: Finished difference Result 106 states and 124 transitions. [2022-03-20 15:55:44,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 15:55:44,104 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 81 [2022-03-20 15:55:44,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:55:44,105 INFO L225 Difference]: With dead ends: 106 [2022-03-20 15:55:44,105 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 15:55:44,106 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 146 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2022-03-20 15:55:44,106 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 27 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:55:44,106 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 130 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:55:44,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 15:55:44,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91. [2022-03-20 15:55:44,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 57 states have internal predecessors, (63), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 15:55:44,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-03-20 15:55:44,113 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 81 [2022-03-20 15:55:44,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:55:44,113 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-03-20 15:55:44,113 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-03-20 15:55:44,113 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-03-20 15:55:44,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 15:55:44,114 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:55:44,114 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:55:44,131 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 15:55:44,327 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:55:44,327 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:55:44,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:55:44,328 INFO L85 PathProgramCache]: Analyzing trace with hash -454578581, now seen corresponding path program 7 times [2022-03-20 15:55:44,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:55:44,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [568180665] [2022-03-20 15:55:44,330 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:55:44,330 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:55:44,331 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:55:44,331 INFO L85 PathProgramCache]: Analyzing trace with hash -454578581, now seen corresponding path program 8 times [2022-03-20 15:55:44,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:55:44,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022840276] [2022-03-20 15:55:44,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:55:44,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:55:44,337 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:55:44,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1164828481] [2022-03-20 15:55:44,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:55:44,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:55:44,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:55:44,338 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 15:55:44,339 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 15:55:44,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:55:44,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:55:44,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 15:55:44,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:55:44,634 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-03-20 15:55:44,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:55:45,652 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 24 proven. 13 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2022-03-20 15:55:45,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:55:45,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022840276] [2022-03-20 15:55:45,653 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:55:45,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164828481] [2022-03-20 15:55:45,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164828481] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:55:45,653 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:55:45,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-03-20 15:55:45,653 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:55:45,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [568180665] [2022-03-20 15:55:45,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [568180665] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:55:45,653 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:55:45,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 15:55:45,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109419419] [2022-03-20 15:55:45,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:55:45,654 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 15:55:45,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:55:45,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 15:55:45,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-03-20 15:55:45,654 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-03-20 15:55:45,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:55:45,782 INFO L93 Difference]: Finished difference Result 170 states and 221 transitions. [2022-03-20 15:55:45,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 15:55:45,782 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 86 [2022-03-20 15:55:45,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:55:45,783 INFO L225 Difference]: With dead ends: 170 [2022-03-20 15:55:45,783 INFO L226 Difference]: Without dead ends: 132 [2022-03-20 15:55:45,784 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 161 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2022-03-20 15:55:45,784 INFO L913 BasicCegarLoop]: 57 mSDtfsCounter, 10 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:55:45,784 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 277 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:55:45,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-20 15:55:45,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2022-03-20 15:55:45,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 78 states have (on average 1.141025641025641) internal successors, (89), 82 states have internal predecessors, (89), 36 states have call successors, (36), 16 states have call predecessors, (36), 15 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2022-03-20 15:55:45,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 158 transitions. [2022-03-20 15:55:45,794 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 158 transitions. Word has length 86 [2022-03-20 15:55:45,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:55:45,794 INFO L478 AbstractCegarLoop]: Abstraction has 130 states and 158 transitions. [2022-03-20 15:55:45,794 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-03-20 15:55:45,794 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 158 transitions. [2022-03-20 15:55:45,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-03-20 15:55:45,795 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:55:45,795 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:55:45,814 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 15:55:46,011 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,SelfDestructingSolverStorable10 [2022-03-20 15:55:46,012 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:55:46,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:55:46,012 INFO L85 PathProgramCache]: Analyzing trace with hash -132947769, now seen corresponding path program 9 times [2022-03-20 15:55:46,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:55:46,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [199128129] [2022-03-20 15:55:46,014 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:55:46,014 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:55:46,014 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:55:46,014 INFO L85 PathProgramCache]: Analyzing trace with hash -132947769, now seen corresponding path program 10 times [2022-03-20 15:55:46,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:55:46,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110876262] [2022-03-20 15:55:46,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:55:46,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:55:46,020 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:55:46,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1711408294] [2022-03-20 15:55:46,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 15:55:46,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:55:46,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:55:46,023 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 15:55:46,024 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 15:55:46,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 15:55:46,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:55:46,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 15:55:46,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:55:46,550 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 26 proven. 24 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-03-20 15:55:46,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:56:00,211 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 26 proven. 24 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-03-20 15:56:00,211 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:00,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110876262] [2022-03-20 15:56:00,211 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:00,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711408294] [2022-03-20 15:56:00,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711408294] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:56:00,211 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:56:00,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2022-03-20 15:56:00,212 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:00,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [199128129] [2022-03-20 15:56:00,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [199128129] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:00,212 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:00,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 15:56:00,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117531663] [2022-03-20 15:56:00,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:00,212 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 15:56:00,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:00,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 15:56:00,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2022-03-20 15:56:00,213 INFO L87 Difference]: Start difference. First operand 130 states and 158 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 6 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 15:56:00,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:00,452 INFO L93 Difference]: Finished difference Result 164 states and 189 transitions. [2022-03-20 15:56:00,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 15:56:00,453 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 6 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 94 [2022-03-20 15:56:00,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:00,454 INFO L225 Difference]: With dead ends: 164 [2022-03-20 15:56:00,454 INFO L226 Difference]: Without dead ends: 157 [2022-03-20 15:56:00,454 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2022-03-20 15:56:00,454 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 11 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:00,455 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 425 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 15:56:00,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-03-20 15:56:00,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 154. [2022-03-20 15:56:00,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 96 states have (on average 1.1041666666666667) internal successors, (106), 100 states have internal predecessors, (106), 36 states have call successors, (36), 22 states have call predecessors, (36), 21 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2022-03-20 15:56:00,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 175 transitions. [2022-03-20 15:56:00,464 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 175 transitions. Word has length 94 [2022-03-20 15:56:00,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:00,465 INFO L478 AbstractCegarLoop]: Abstraction has 154 states and 175 transitions. [2022-03-20 15:56:00,465 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 6 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 15:56:00,465 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 175 transitions. [2022-03-20 15:56:00,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-20 15:56:00,465 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:00,466 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:00,485 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 15:56:00,672 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:00,673 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:00,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:00,673 INFO L85 PathProgramCache]: Analyzing trace with hash -321511332, now seen corresponding path program 11 times [2022-03-20 15:56:00,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:00,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1313852836] [2022-03-20 15:56:00,676 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:00,676 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:00,676 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:00,676 INFO L85 PathProgramCache]: Analyzing trace with hash -321511332, now seen corresponding path program 12 times [2022-03-20 15:56:00,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:00,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633657774] [2022-03-20 15:56:00,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:00,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:00,682 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:00,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1982486452] [2022-03-20 15:56:00,682 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 15:56:00,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:00,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:00,684 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 15:56:00,685 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 15:56:00,732 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 15:56:00,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:00,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 15:56:00,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:00,948 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 70 proven. 22 refuted. 0 times theorem prover too weak. 391 trivial. 0 not checked. [2022-03-20 15:56:00,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:56:01,933 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 69 proven. 23 refuted. 0 times theorem prover too weak. 391 trivial. 0 not checked. [2022-03-20 15:56:01,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:01,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633657774] [2022-03-20 15:56:01,934 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:01,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982486452] [2022-03-20 15:56:01,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982486452] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:56:01,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:56:01,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-03-20 15:56:01,934 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:01,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1313852836] [2022-03-20 15:56:01,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1313852836] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:01,934 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:01,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 15:56:01,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439028205] [2022-03-20 15:56:01,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:01,935 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 15:56:01,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:01,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 15:56:01,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2022-03-20 15:56:01,935 INFO L87 Difference]: Start difference. First operand 154 states and 175 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 15:56:02,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:02,036 INFO L93 Difference]: Finished difference Result 164 states and 183 transitions. [2022-03-20 15:56:02,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 15:56:02,036 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 103 [2022-03-20 15:56:02,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:02,038 INFO L225 Difference]: With dead ends: 164 [2022-03-20 15:56:02,038 INFO L226 Difference]: Without dead ends: 162 [2022-03-20 15:56:02,038 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 193 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-20 15:56:02,038 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 17 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:02,038 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 138 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:56:02,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-03-20 15:56:02,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2022-03-20 15:56:02,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 102 states have (on average 1.0980392156862746) internal successors, (112), 106 states have internal predecessors, (112), 36 states have call successors, (36), 24 states have call predecessors, (36), 23 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2022-03-20 15:56:02,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2022-03-20 15:56:02,049 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 103 [2022-03-20 15:56:02,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:02,050 INFO L478 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2022-03-20 15:56:02,050 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 15:56:02,050 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2022-03-20 15:56:02,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 15:56:02,051 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:02,051 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:02,069 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 15:56:02,268 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 15:56:02,269 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:02,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:02,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1306280540, now seen corresponding path program 3 times [2022-03-20 15:56:02,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:02,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [369092584] [2022-03-20 15:56:02,271 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:02,271 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:02,271 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:02,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1306280540, now seen corresponding path program 4 times [2022-03-20 15:56:02,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:02,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889695091] [2022-03-20 15:56:02,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:02,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:02,277 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:02,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [547965366] [2022-03-20 15:56:02,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 15:56:02,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:02,277 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:02,279 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:56:02,280 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 15:56:02,333 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 15:56:02,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:02,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 15:56:02,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:02,684 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 30 proven. 28 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 15:56:02,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:56:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 30 proven. 28 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 15:56:07,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:07,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889695091] [2022-03-20 15:56:07,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:07,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547965366] [2022-03-20 15:56:07,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547965366] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:56:07,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:56:07,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 16 [2022-03-20 15:56:07,099 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:07,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [369092584] [2022-03-20 15:56:07,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [369092584] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:07,100 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:07,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 15:56:07,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036668879] [2022-03-20 15:56:07,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:07,100 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 15:56:07,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:07,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 15:56:07,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-03-20 15:56:07,101 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-03-20 15:56:07,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:07,257 INFO L93 Difference]: Finished difference Result 171 states and 190 transitions. [2022-03-20 15:56:07,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 15:56:07,258 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 105 [2022-03-20 15:56:07,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:07,259 INFO L225 Difference]: With dead ends: 171 [2022-03-20 15:56:07,259 INFO L226 Difference]: Without dead ends: 143 [2022-03-20 15:56:07,259 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 191 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2022-03-20 15:56:07,259 INFO L913 BasicCegarLoop]: 56 mSDtfsCounter, 9 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:07,260 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 414 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:56:07,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-03-20 15:56:07,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2022-03-20 15:56:07,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 89 states have (on average 1.101123595505618) internal successors, (98), 92 states have internal predecessors, (98), 33 states have call successors, (33), 21 states have call predecessors, (33), 20 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2022-03-20 15:56:07,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 161 transitions. [2022-03-20 15:56:07,270 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 161 transitions. Word has length 105 [2022-03-20 15:56:07,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:07,270 INFO L478 AbstractCegarLoop]: Abstraction has 143 states and 161 transitions. [2022-03-20 15:56:07,270 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-03-20 15:56:07,270 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 161 transitions. [2022-03-20 15:56:07,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 15:56:07,271 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:07,271 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:07,288 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 15:56:07,475 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 15:56:07,475 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:07,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:07,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1328912794, now seen corresponding path program 1 times [2022-03-20 15:56:07,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:07,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [149184050] [2022-03-20 15:56:07,478 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:07,478 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:07,478 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:07,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1328912794, now seen corresponding path program 2 times [2022-03-20 15:56:07,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:07,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126387339] [2022-03-20 15:56:07,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:07,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:07,486 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:07,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1614412866] [2022-03-20 15:56:07,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:56:07,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:07,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:07,488 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:56:07,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 15:56:07,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:56:07,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:07,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 15:56:07,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:07,776 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 222 proven. 0 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2022-03-20 15:56:07,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 15:56:07,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:07,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126387339] [2022-03-20 15:56:07,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:07,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614412866] [2022-03-20 15:56:07,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614412866] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:07,777 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:07,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:56:07,777 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:07,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [149184050] [2022-03-20 15:56:07,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [149184050] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:07,777 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:07,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:56:07,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303655500] [2022-03-20 15:56:07,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:07,778 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 15:56:07,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:07,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 15:56:07,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:56:07,778 INFO L87 Difference]: Start difference. First operand 143 states and 161 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 15:56:07,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:07,858 INFO L93 Difference]: Finished difference Result 195 states and 230 transitions. [2022-03-20 15:56:07,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 15:56:07,859 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 105 [2022-03-20 15:56:07,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:07,860 INFO L225 Difference]: With dead ends: 195 [2022-03-20 15:56:07,860 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 15:56:07,860 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-20 15:56:07,860 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 8 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:07,860 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 193 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 15:56:07,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 15:56:07,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 107. [2022-03-20 15:56:07,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 67 states have (on average 1.0895522388059702) internal successors, (73), 68 states have internal predecessors, (73), 23 states have call successors, (23), 17 states have call predecessors, (23), 16 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 15:56:07,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 117 transitions. [2022-03-20 15:56:07,891 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 117 transitions. Word has length 105 [2022-03-20 15:56:07,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:07,891 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 117 transitions. [2022-03-20 15:56:07,892 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 15:56:07,892 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 117 transitions. [2022-03-20 15:56:07,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-03-20 15:56:07,892 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:07,892 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:07,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 15:56:08,107 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 15:56:08,107 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:08,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:08,108 INFO L85 PathProgramCache]: Analyzing trace with hash -416382532, now seen corresponding path program 5 times [2022-03-20 15:56:08,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:08,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [257454193] [2022-03-20 15:56:08,110 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:08,110 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:08,110 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:08,110 INFO L85 PathProgramCache]: Analyzing trace with hash -416382532, now seen corresponding path program 6 times [2022-03-20 15:56:08,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:08,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943856539] [2022-03-20 15:56:08,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:08,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:08,116 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:08,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [50366319] [2022-03-20 15:56:08,116 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 15:56:08,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:08,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:08,117 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:56:08,118 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 15:56:08,169 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 15:56:08,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:08,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 15:56:08,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:08,447 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-03-20 15:56:08,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:56:08,678 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2022-03-20 15:56:08,679 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:08,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943856539] [2022-03-20 15:56:08,679 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:08,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50366319] [2022-03-20 15:56:08,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50366319] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:56:08,679 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:56:08,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2022-03-20 15:56:08,679 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:08,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [257454193] [2022-03-20 15:56:08,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [257454193] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:08,679 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:08,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 15:56:08,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595581550] [2022-03-20 15:56:08,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:08,680 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 15:56:08,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:08,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 15:56:08,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:56:08,680 INFO L87 Difference]: Start difference. First operand 107 states and 117 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2022-03-20 15:56:08,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:08,737 INFO L93 Difference]: Finished difference Result 128 states and 148 transitions. [2022-03-20 15:56:08,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 15:56:08,738 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) Word has length 109 [2022-03-20 15:56:08,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:08,739 INFO L225 Difference]: With dead ends: 128 [2022-03-20 15:56:08,739 INFO L226 Difference]: Without dead ends: 120 [2022-03-20 15:56:08,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 208 SyntacticMatches, 5 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 15:56:08,739 INFO L913 BasicCegarLoop]: 61 mSDtfsCounter, 17 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:08,739 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 132 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 15:56:08,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-03-20 15:56:08,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-03-20 15:56:08,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 75 states have internal predecessors, (81), 29 states have call successors, (29), 17 states have call predecessors, (29), 16 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-03-20 15:56:08,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 137 transitions. [2022-03-20 15:56:08,749 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 137 transitions. Word has length 109 [2022-03-20 15:56:08,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:08,749 INFO L478 AbstractCegarLoop]: Abstraction has 120 states and 137 transitions. [2022-03-20 15:56:08,749 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2022-03-20 15:56:08,749 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 137 transitions. [2022-03-20 15:56:08,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-03-20 15:56:08,750 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:08,750 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:08,771 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 15:56:08,963 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 15:56:08,963 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:08,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:08,964 INFO L85 PathProgramCache]: Analyzing trace with hash -76721736, now seen corresponding path program 13 times [2022-03-20 15:56:08,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:08,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [798029992] [2022-03-20 15:56:08,966 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:08,966 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:08,966 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:08,966 INFO L85 PathProgramCache]: Analyzing trace with hash -76721736, now seen corresponding path program 14 times [2022-03-20 15:56:08,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:08,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496422080] [2022-03-20 15:56:08,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:08,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:08,972 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:08,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1411252403] [2022-03-20 15:56:08,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:56:08,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:08,972 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:08,973 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:56:08,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 15:56:09,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:56:09,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:09,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 15:56:09,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:09,521 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-03-20 15:56:09,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:56:36,203 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-03-20 15:56:36,204 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:56:36,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496422080] [2022-03-20 15:56:36,204 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:56:36,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411252403] [2022-03-20 15:56:36,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411252403] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:56:36,204 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:56:36,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-03-20 15:56:36,204 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:56:36,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [798029992] [2022-03-20 15:56:36,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [798029992] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:56:36,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:56:36,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 15:56:36,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596574835] [2022-03-20 15:56:36,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:56:36,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 15:56:36,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:36,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 15:56:36,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=227, Unknown=3, NotChecked=0, Total=306 [2022-03-20 15:56:36,206 INFO L87 Difference]: Start difference. First operand 120 states and 137 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2022-03-20 15:56:36,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:56:36,451 INFO L93 Difference]: Finished difference Result 180 states and 208 transitions. [2022-03-20 15:56:36,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 15:56:36,452 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) Word has length 111 [2022-03-20 15:56:36,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:56:36,453 INFO L225 Difference]: With dead ends: 180 [2022-03-20 15:56:36,453 INFO L226 Difference]: Without dead ends: 178 [2022-03-20 15:56:36,453 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 202 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=80, Invalid=259, Unknown=3, NotChecked=0, Total=342 [2022-03-20 15:56:36,453 INFO L913 BasicCegarLoop]: 58 mSDtfsCounter, 10 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 15:56:36,454 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 501 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 15:56:36,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-03-20 15:56:36,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 175. [2022-03-20 15:56:36,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 109 states have (on average 1.1009174311926606) internal successors, (120), 111 states have internal predecessors, (120), 42 states have call successors, (42), 24 states have call predecessors, (42), 23 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2022-03-20 15:56:36,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 202 transitions. [2022-03-20 15:56:36,473 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 202 transitions. Word has length 111 [2022-03-20 15:56:36,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:56:36,474 INFO L478 AbstractCegarLoop]: Abstraction has 175 states and 202 transitions. [2022-03-20 15:56:36,474 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2022-03-20 15:56:36,474 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 202 transitions. [2022-03-20 15:56:36,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-03-20 15:56:36,475 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:56:36,475 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:56:36,492 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 15:56:36,675 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:36,677 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:56:36,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:56:36,678 INFO L85 PathProgramCache]: Analyzing trace with hash -238794489, now seen corresponding path program 15 times [2022-03-20 15:56:36,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:56:36,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1881688057] [2022-03-20 15:56:36,680 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:56:36,680 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:56:36,680 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:56:36,680 INFO L85 PathProgramCache]: Analyzing trace with hash -238794489, now seen corresponding path program 16 times [2022-03-20 15:56:36,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:56:36,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467281356] [2022-03-20 15:56:36,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:56:36,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:56:36,686 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:56:36,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [404989028] [2022-03-20 15:56:36,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 15:56:36,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:56:36,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:56:36,687 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:56:36,696 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 15:56:36,747 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 15:56:36,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:56:36,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 15:56:36,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:56:37,306 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-03-20 15:56:37,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:57:15,789 WARN L232 SmtUtils]: Spent 7.89s on a formula simplification that was a NOOP. DAG size: 433 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 15:59:06,053 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-03-20 15:59:06,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 15:59:06,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467281356] [2022-03-20 15:59:06,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 15:59:06,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404989028] [2022-03-20 15:59:06,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404989028] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 15:59:06,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 15:59:06,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2022-03-20 15:59:06,054 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 15:59:06,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1881688057] [2022-03-20 15:59:06,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1881688057] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 15:59:06,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 15:59:06,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 15:59:06,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904676213] [2022-03-20 15:59:06,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 15:59:06,054 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 15:59:06,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 15:59:06,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 15:59:06,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=344, Unknown=4, NotChecked=0, Total=462 [2022-03-20 15:59:06,055 INFO L87 Difference]: Start difference. First operand 175 states and 202 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 15:59:06,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 15:59:06,548 INFO L93 Difference]: Finished difference Result 219 states and 257 transitions. [2022-03-20 15:59:06,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 15:59:06,549 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 124 [2022-03-20 15:59:06,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 15:59:06,550 INFO L225 Difference]: With dead ends: 219 [2022-03-20 15:59:06,550 INFO L226 Difference]: Without dead ends: 187 [2022-03-20 15:59:06,550 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 224 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=118, Invalid=384, Unknown=4, NotChecked=0, Total=506 [2022-03-20 15:59:06,550 INFO L913 BasicCegarLoop]: 63 mSDtfsCounter, 13 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 665 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 15:59:06,551 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 665 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 15:59:06,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-03-20 15:59:06,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 184. [2022-03-20 15:59:06,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 116 states have (on average 1.0948275862068966) internal successors, (127), 118 states have internal predecessors, (127), 42 states have call successors, (42), 26 states have call predecessors, (42), 25 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2022-03-20 15:59:06,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 209 transitions. [2022-03-20 15:59:06,566 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 209 transitions. Word has length 124 [2022-03-20 15:59:06,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 15:59:06,566 INFO L478 AbstractCegarLoop]: Abstraction has 184 states and 209 transitions. [2022-03-20 15:59:06,566 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 15:59:06,566 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 209 transitions. [2022-03-20 15:59:06,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-03-20 15:59:06,567 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 15:59:06,567 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 15:59:06,585 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-03-20 15:59:06,783 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 15:59:06,785 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 15:59:06,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 15:59:06,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1927738231, now seen corresponding path program 1 times [2022-03-20 15:59:06,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 15:59:06,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1384569942] [2022-03-20 15:59:06,788 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 15:59:06,788 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 15:59:06,788 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 15:59:06,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1927738231, now seen corresponding path program 2 times [2022-03-20 15:59:06,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 15:59:06,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421517881] [2022-03-20 15:59:06,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 15:59:06,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 15:59:06,793 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 15:59:06,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [281231092] [2022-03-20 15:59:06,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 15:59:06,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 15:59:06,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 15:59:06,795 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 15:59:06,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 15:59:06,848 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 15:59:06,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 15:59:06,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 15:59:06,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 15:59:07,513 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-03-20 15:59:07,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 15:59:42,106 WARN L232 SmtUtils]: Spent 8.79s on a formula simplification that was a NOOP. DAG size: 437 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:01:12,139 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-03-20 16:01:12,140 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:01:12,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421517881] [2022-03-20 16:01:12,140 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:01:12,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281231092] [2022-03-20 16:01:12,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281231092] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:01:12,140 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:01:12,140 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-20 16:01:12,141 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:01:12,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1384569942] [2022-03-20 16:01:12,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1384569942] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:01:12,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:01:12,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:01:12,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640383257] [2022-03-20 16:01:12,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:01:12,141 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:01:12,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:01:12,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:01:12,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2022-03-20 16:01:12,142 INFO L87 Difference]: Start difference. First operand 184 states and 209 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 16:01:12,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:01:12,517 INFO L93 Difference]: Finished difference Result 237 states and 276 transitions. [2022-03-20 16:01:12,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:01:12,517 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 124 [2022-03-20 16:01:12,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:01:12,518 INFO L225 Difference]: With dead ends: 237 [2022-03-20 16:01:12,518 INFO L226 Difference]: Without dead ends: 197 [2022-03-20 16:01:12,519 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=147, Invalid=453, Unknown=0, NotChecked=0, Total=600 [2022-03-20 16:01:12,519 INFO L913 BasicCegarLoop]: 63 mSDtfsCounter, 13 mSDsluCounter, 595 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 658 SdHoareTripleChecker+Invalid, 540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:01:12,519 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 658 Invalid, 540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:01:12,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-03-20 16:01:12,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 184. [2022-03-20 16:01:12,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 116 states have (on average 1.0948275862068966) internal successors, (127), 118 states have internal predecessors, (127), 42 states have call successors, (42), 26 states have call predecessors, (42), 25 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2022-03-20 16:01:12,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 209 transitions. [2022-03-20 16:01:12,540 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 209 transitions. Word has length 124 [2022-03-20 16:01:12,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:01:12,541 INFO L478 AbstractCegarLoop]: Abstraction has 184 states and 209 transitions. [2022-03-20 16:01:12,541 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-03-20 16:01:12,541 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 209 transitions. [2022-03-20 16:01:12,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-03-20 16:01:12,543 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:01:12,543 INFO L499 BasicCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:01:12,560 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 16:01:12,751 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:01:12,751 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:01:12,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:01:12,752 INFO L85 PathProgramCache]: Analyzing trace with hash -964214553, now seen corresponding path program 17 times [2022-03-20 16:01:12,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:01:12,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [629115882] [2022-03-20 16:01:12,754 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:01:12,754 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:01:12,754 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:01:12,754 INFO L85 PathProgramCache]: Analyzing trace with hash -964214553, now seen corresponding path program 18 times [2022-03-20 16:01:12,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:01:12,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080466671] [2022-03-20 16:01:12,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:01:12,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:01:12,759 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:01:12,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1949171062] [2022-03-20 16:01:12,759 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:01:12,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:01:12,760 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:01:12,761 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:01:12,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 16:01:12,837 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 16:01:12,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:01:12,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 16:01:12,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:01:13,413 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:01:13,527 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 199 proven. 27 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2022-03-20 16:01:13,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:01:32,425 WARN L232 SmtUtils]: Spent 9.88s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:02:06,753 WARN L232 SmtUtils]: Spent 6.90s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:03:28,617 INFO L134 CoverageAnalysis]: Checked inductivity of 781 backedges. 168 proven. 16 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2022-03-20 16:03:28,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:03:28,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080466671] [2022-03-20 16:03:28,617 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:03:28,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949171062] [2022-03-20 16:03:28,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949171062] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:03:28,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:03:28,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 20 [2022-03-20 16:03:28,618 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:03:28,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [629115882] [2022-03-20 16:03:28,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [629115882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:03:28,618 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:03:28,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:03:28,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088525651] [2022-03-20 16:03:28,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:03:28,618 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:03:28,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:28,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:03:28,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2022-03-20 16:03:28,619 INFO L87 Difference]: Start difference. First operand 184 states and 209 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 16:03:31,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:03:31,285 INFO L93 Difference]: Finished difference Result 207 states and 234 transitions. [2022-03-20 16:03:31,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:03:31,285 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 128 [2022-03-20 16:03:31,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:03:31,286 INFO L225 Difference]: With dead ends: 207 [2022-03-20 16:03:31,286 INFO L226 Difference]: Without dead ends: 205 [2022-03-20 16:03:31,287 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 232 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:03:31,287 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 21 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:03:31,287 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 361 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:03:31,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-03-20 16:03:31,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 192. [2022-03-20 16:03:31,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 122 states have (on average 1.0901639344262295) internal successors, (133), 124 states have internal predecessors, (133), 42 states have call successors, (42), 28 states have call predecessors, (42), 27 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2022-03-20 16:03:31,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 215 transitions. [2022-03-20 16:03:31,304 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 215 transitions. Word has length 128 [2022-03-20 16:03:31,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:03:31,305 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 215 transitions. [2022-03-20 16:03:31,306 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-03-20 16:03:31,306 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 215 transitions. [2022-03-20 16:03:31,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-03-20 16:03:31,307 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:03:31,307 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 20, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:03:31,327 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 16:03:31,523 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:31,523 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:03:31,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:03:31,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1349759516, now seen corresponding path program 7 times [2022-03-20 16:03:31,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:31,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [766444285] [2022-03-20 16:03:31,526 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:03:31,526 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:03:31,526 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:03:31,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1349759516, now seen corresponding path program 8 times [2022-03-20 16:03:31,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:03:31,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383828543] [2022-03-20 16:03:31,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:03:31,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:03:31,531 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:03:31,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [878133375] [2022-03-20 16:03:31,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:03:31,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:31,532 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:03:31,533 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:03:31,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 16:03:31,585 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:03:31,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:03:31,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 16:03:31,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:03:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 40 proven. 57 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2022-03-20 16:03:32,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:03:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 40 proven. 57 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2022-03-20 16:03:44,737 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:03:44,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383828543] [2022-03-20 16:03:44,737 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:03:44,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878133375] [2022-03-20 16:03:44,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878133375] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:03:44,737 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:03:44,737 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 22 [2022-03-20 16:03:44,738 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:03:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [766444285] [2022-03-20 16:03:44,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [766444285] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:03:44,738 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:03:44,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:03:44,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332085045] [2022-03-20 16:03:44,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:03:44,738 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:03:44,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:44,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:03:44,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=348, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:03:44,739 INFO L87 Difference]: Start difference. First operand 192 states and 215 transitions. Second operand has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2022-03-20 16:03:45,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:03:45,035 INFO L93 Difference]: Finished difference Result 230 states and 263 transitions. [2022-03-20 16:03:45,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:03:45,035 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) Word has length 135 [2022-03-20 16:03:45,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:03:45,036 INFO L225 Difference]: With dead ends: 230 [2022-03-20 16:03:45,036 INFO L226 Difference]: Without dead ends: 204 [2022-03-20 16:03:45,037 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 245 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2022-03-20 16:03:45,037 INFO L913 BasicCegarLoop]: 67 mSDtfsCounter, 9 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 638 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:03:45,037 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 638 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:03:45,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-03-20 16:03:45,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 203. [2022-03-20 16:03:45,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 131 states have internal predecessors, (140), 45 states have call successors, (45), 29 states have call predecessors, (45), 28 states have return successors, (43), 42 states have call predecessors, (43), 43 states have call successors, (43) [2022-03-20 16:03:45,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 228 transitions. [2022-03-20 16:03:45,057 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 228 transitions. Word has length 135 [2022-03-20 16:03:45,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:03:45,057 INFO L478 AbstractCegarLoop]: Abstraction has 203 states and 228 transitions. [2022-03-20 16:03:45,057 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2022-03-20 16:03:45,057 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 228 transitions. [2022-03-20 16:03:45,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-03-20 16:03:45,058 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:03:45,058 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 20, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:03:45,075 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 16:03:45,263 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:45,264 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:03:45,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:03:45,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1372391770, now seen corresponding path program 3 times [2022-03-20 16:03:45,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:45,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [426963274] [2022-03-20 16:03:45,266 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:03:45,266 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:03:45,266 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:03:45,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1372391770, now seen corresponding path program 4 times [2022-03-20 16:03:45,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:03:45,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989902044] [2022-03-20 16:03:45,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:03:45,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:03:45,272 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:03:45,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1201527304] [2022-03-20 16:03:45,272 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:03:45,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:45,272 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:03:45,273 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:03:45,274 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 16:03:45,323 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:03:45,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:03:45,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 16:03:45,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:03:45,936 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 40 proven. 57 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2022-03-20 16:03:45,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:03:46,509 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:03:46,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989902044] [2022-03-20 16:03:46,509 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:03:46,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201527304] [2022-03-20 16:03:46,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201527304] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:03:46,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:03:46,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-20 16:03:46,510 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:03:46,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [426963274] [2022-03-20 16:03:46,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [426963274] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:03:46,510 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:03:46,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 16:03:46,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343581627] [2022-03-20 16:03:46,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:03:46,511 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 16:03:46,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:46,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 16:03:46,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2022-03-20 16:03:46,512 INFO L87 Difference]: Start difference. First operand 203 states and 228 transitions. Second operand has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2022-03-20 16:03:46,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:03:46,843 INFO L93 Difference]: Finished difference Result 239 states and 274 transitions. [2022-03-20 16:03:46,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:03:46,844 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) Word has length 135 [2022-03-20 16:03:46,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:03:46,845 INFO L225 Difference]: With dead ends: 239 [2022-03-20 16:03:46,845 INFO L226 Difference]: Without dead ends: 213 [2022-03-20 16:03:46,846 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 146 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:03:46,846 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 9 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:03:46,846 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 574 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:03:46,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-03-20 16:03:46,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 201. [2022-03-20 16:03:46,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 127 states have (on average 1.0866141732283465) internal successors, (138), 130 states have internal predecessors, (138), 45 states have call successors, (45), 29 states have call predecessors, (45), 28 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) [2022-03-20 16:03:46,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 226 transitions. [2022-03-20 16:03:46,874 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 226 transitions. Word has length 135 [2022-03-20 16:03:46,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:03:46,874 INFO L478 AbstractCegarLoop]: Abstraction has 201 states and 226 transitions. [2022-03-20 16:03:46,874 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 9 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2022-03-20 16:03:46,874 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 226 transitions. [2022-03-20 16:03:46,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-03-20 16:03:46,875 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:03:46,875 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:03:46,895 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 16:03:47,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:47,091 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:03:47,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:03:47,092 INFO L85 PathProgramCache]: Analyzing trace with hash 66667591, now seen corresponding path program 1 times [2022-03-20 16:03:47,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:47,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [443587055] [2022-03-20 16:03:47,094 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:03:47,094 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:03:47,094 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:03:47,094 INFO L85 PathProgramCache]: Analyzing trace with hash 66667591, now seen corresponding path program 2 times [2022-03-20 16:03:47,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:03:47,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886982087] [2022-03-20 16:03:47,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:03:47,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:03:47,101 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:03:47,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [14154229] [2022-03-20 16:03:47,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:03:47,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:47,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:03:47,102 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:03:47,103 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 16:03:47,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:03:47,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:03:47,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 16:03:47,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:03:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 939 backedges. 42 proven. 57 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-03-20 16:03:47,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:03:49,535 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:03:49,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886982087] [2022-03-20 16:03:49,535 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:03:49,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14154229] [2022-03-20 16:03:49,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14154229] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:03:49,536 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:03:49,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-03-20 16:03:49,536 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:03:49,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [443587055] [2022-03-20 16:03:49,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [443587055] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:03:49,536 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:03:49,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:03:49,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632707415] [2022-03-20 16:03:49,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:03:49,537 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:03:49,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:49,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:03:49,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-03-20 16:03:49,537 INFO L87 Difference]: Start difference. First operand 201 states and 226 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:03:49,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:03:49,850 INFO L93 Difference]: Finished difference Result 208 states and 232 transitions. [2022-03-20 16:03:49,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:03:49,850 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) Word has length 140 [2022-03-20 16:03:49,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:03:49,851 INFO L225 Difference]: With dead ends: 208 [2022-03-20 16:03:49,851 INFO L226 Difference]: Without dead ends: 154 [2022-03-20 16:03:49,852 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 157 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2022-03-20 16:03:49,852 INFO L913 BasicCegarLoop]: 76 mSDtfsCounter, 16 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 613 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:03:49,852 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 613 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:03:49,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2022-03-20 16:03:49,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2022-03-20 16:03:49,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 97 states have (on average 1.092783505154639) internal successors, (106), 98 states have internal predecessors, (106), 34 states have call successors, (34), 23 states have call predecessors, (34), 22 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2022-03-20 16:03:49,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 172 transitions. [2022-03-20 16:03:49,868 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 172 transitions. Word has length 140 [2022-03-20 16:03:49,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:03:49,868 INFO L478 AbstractCegarLoop]: Abstraction has 154 states and 172 transitions. [2022-03-20 16:03:49,869 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:03:49,869 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 172 transitions. [2022-03-20 16:03:49,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-03-20 16:03:49,869 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:03:49,870 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 21, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:03:49,886 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-20 16:03:50,083 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-03-20 16:03:50,083 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:03:50,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:03:50,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1044299320, now seen corresponding path program 19 times [2022-03-20 16:03:50,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:03:50,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2078050963] [2022-03-20 16:03:50,086 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:03:50,086 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:03:50,086 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:03:50,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1044299320, now seen corresponding path program 20 times [2022-03-20 16:03:50,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:03:50,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119539615] [2022-03-20 16:03:50,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:03:50,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:03:50,091 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:03:50,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [736907845] [2022-03-20 16:03:50,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:03:50,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:03:50,092 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:03:50,095 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:03:50,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 16:03:50,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:03:50,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:03:50,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 16:03:50,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:03:50,790 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 42 proven. 71 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-03-20 16:03:50,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:04:34,061 WARN L232 SmtUtils]: Spent 9.98s on a formula simplification that was a NOOP. DAG size: 433 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:06:27,577 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 42 proven. 71 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-03-20 16:06:27,577 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:06:27,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119539615] [2022-03-20 16:06:27,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:06:27,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736907845] [2022-03-20 16:06:27,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736907845] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:06:27,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:06:27,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-03-20 16:06:27,578 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:06:27,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2078050963] [2022-03-20 16:06:27,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2078050963] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:06:27,578 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:06:27,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:06:27,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838811170] [2022-03-20 16:06:27,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:06:27,579 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:06:27,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:06:27,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:06:27,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=412, Unknown=4, NotChecked=0, Total=552 [2022-03-20 16:06:27,579 INFO L87 Difference]: Start difference. First operand 154 states and 172 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:06:28,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:06:28,075 INFO L93 Difference]: Finished difference Result 233 states and 265 transitions. [2022-03-20 16:06:28,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:06:28,077 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) Word has length 141 [2022-03-20 16:06:28,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:06:28,078 INFO L225 Difference]: With dead ends: 233 [2022-03-20 16:06:28,078 INFO L226 Difference]: Without dead ends: 225 [2022-03-20 16:06:28,078 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 256 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=140, Invalid=456, Unknown=4, NotChecked=0, Total=600 [2022-03-20 16:06:28,078 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 12 mSDsluCounter, 682 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:06:28,079 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 747 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:06:28,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-03-20 16:06:28,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 212. [2022-03-20 16:06:28,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 137 states have internal predecessors, (146), 47 states have call successors, (47), 31 states have call predecessors, (47), 30 states have return successors, (45), 43 states have call predecessors, (45), 45 states have call successors, (45) [2022-03-20 16:06:28,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 238 transitions. [2022-03-20 16:06:28,097 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 238 transitions. Word has length 141 [2022-03-20 16:06:28,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:06:28,097 INFO L478 AbstractCegarLoop]: Abstraction has 212 states and 238 transitions. [2022-03-20 16:06:28,097 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:06:28,097 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 238 transitions. [2022-03-20 16:06:28,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-03-20 16:06:28,098 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:06:28,098 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 21, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:06:28,116 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 16:06:28,303 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-03-20 16:06:28,304 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:06:28,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:06:28,304 INFO L85 PathProgramCache]: Analyzing trace with hash -644644422, now seen corresponding path program 3 times [2022-03-20 16:06:28,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:06:28,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1232872622] [2022-03-20 16:06:28,306 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:06:28,306 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:06:28,306 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:06:28,306 INFO L85 PathProgramCache]: Analyzing trace with hash -644644422, now seen corresponding path program 4 times [2022-03-20 16:06:28,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:06:28,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977864929] [2022-03-20 16:06:28,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:06:28,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:06:28,312 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:06:28,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [806570944] [2022-03-20 16:06:28,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:06:28,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:06:28,313 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:06:28,314 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:06:28,314 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 16:06:28,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:06:28,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:06:28,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 16:06:28,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:06:28,967 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 42 proven. 71 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-03-20 16:06:28,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:06:58,237 WARN L232 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 429 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:08:33,025 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 42 proven. 71 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-03-20 16:08:33,026 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:08:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977864929] [2022-03-20 16:08:33,026 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:08:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806570944] [2022-03-20 16:08:33,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806570944] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:08:33,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:08:33,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2022-03-20 16:08:33,026 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:08:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1232872622] [2022-03-20 16:08:33,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1232872622] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:08:33,027 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:08:33,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:08:33,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204222674] [2022-03-20 16:08:33,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:08:33,027 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:08:33,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:08:33,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:08:33,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=348, Unknown=0, NotChecked=0, Total=462 [2022-03-20 16:08:33,028 INFO L87 Difference]: Start difference. First operand 212 states and 238 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:08:33,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:08:33,402 INFO L93 Difference]: Finished difference Result 245 states and 278 transitions. [2022-03-20 16:08:33,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:08:33,402 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) Word has length 141 [2022-03-20 16:08:33,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:08:33,404 INFO L225 Difference]: With dead ends: 245 [2022-03-20 16:08:33,404 INFO L226 Difference]: Without dead ends: 237 [2022-03-20 16:08:33,404 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 258 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2022-03-20 16:08:33,404 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 10 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 680 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:08:33,404 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 680 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:08:33,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-03-20 16:08:33,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 225. [2022-03-20 16:08:33,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 143 states have (on average 1.0909090909090908) internal successors, (156), 146 states have internal predecessors, (156), 49 states have call successors, (49), 33 states have call predecessors, (49), 32 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2022-03-20 16:08:33,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2022-03-20 16:08:33,434 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 141 [2022-03-20 16:08:33,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:08:33,434 INFO L478 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2022-03-20 16:08:33,434 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 9 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-03-20 16:08:33,434 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2022-03-20 16:08:33,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-03-20 16:08:33,435 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:08:33,435 INFO L499 BasicCegarLoop]: trace histogram [24, 23, 23, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:08:33,457 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 16:08:33,647 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:08:33,648 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:08:33,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:08:33,648 INFO L85 PathProgramCache]: Analyzing trace with hash -45169589, now seen corresponding path program 9 times [2022-03-20 16:08:33,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:08:33,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1244646228] [2022-03-20 16:08:33,650 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:08:33,650 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:08:33,650 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:08:33,650 INFO L85 PathProgramCache]: Analyzing trace with hash -45169589, now seen corresponding path program 10 times [2022-03-20 16:08:33,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:08:33,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731542580] [2022-03-20 16:08:33,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:08:33,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:08:33,655 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:08:33,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [577359498] [2022-03-20 16:08:33,655 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:08:33,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:08:33,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:08:33,656 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:08:33,657 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 16:08:33,706 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:08:33,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:08:33,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 16:08:33,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:08:34,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1135 backedges. 96 proven. 27 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2022-03-20 16:08:34,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:08:34,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1135 backedges. 96 proven. 27 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2022-03-20 16:08:34,833 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:08:34,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731542580] [2022-03-20 16:08:34,833 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:08:34,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577359498] [2022-03-20 16:08:34,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577359498] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:08:34,833 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:08:34,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2022-03-20 16:08:34,833 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:08:34,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1244646228] [2022-03-20 16:08:34,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1244646228] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:08:34,833 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:08:34,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 16:08:34,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698596003] [2022-03-20 16:08:34,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:08:34,834 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 16:08:34,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:08:34,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 16:08:34,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-03-20 16:08:34,835 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 7 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 6 states have call predecessors, (25), 6 states have call successors, (25) [2022-03-20 16:08:34,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:08:34,942 INFO L93 Difference]: Finished difference Result 249 states and 287 transitions. [2022-03-20 16:08:34,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 16:08:34,942 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 7 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 6 states have call predecessors, (25), 6 states have call successors, (25) Word has length 152 [2022-03-20 16:08:34,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:08:34,943 INFO L225 Difference]: With dead ends: 249 [2022-03-20 16:08:34,943 INFO L226 Difference]: Without dead ends: 241 [2022-03-20 16:08:34,944 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 288 SyntacticMatches, 10 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-03-20 16:08:34,944 INFO L913 BasicCegarLoop]: 70 mSDtfsCounter, 15 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:08:34,944 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 185 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 16:08:34,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2022-03-20 16:08:34,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 239. [2022-03-20 16:08:34,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 151 states have (on average 1.099337748344371) internal successors, (166), 154 states have internal predecessors, (166), 55 states have call successors, (55), 33 states have call predecessors, (55), 32 states have return successors, (53), 51 states have call predecessors, (53), 53 states have call successors, (53) [2022-03-20 16:08:34,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 274 transitions. [2022-03-20 16:08:34,967 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 274 transitions. Word has length 152 [2022-03-20 16:08:34,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:08:34,967 INFO L478 AbstractCegarLoop]: Abstraction has 239 states and 274 transitions. [2022-03-20 16:08:34,967 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 7 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 6 states have call predecessors, (25), 6 states have call successors, (25) [2022-03-20 16:08:34,967 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 274 transitions. [2022-03-20 16:08:34,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-03-20 16:08:34,968 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:08:34,968 INFO L499 BasicCegarLoop]: trace histogram [24, 23, 23, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:08:34,986 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 16:08:35,175 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:08:35,175 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:08:35,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:08:35,176 INFO L85 PathProgramCache]: Analyzing trace with hash 176630919, now seen corresponding path program 21 times [2022-03-20 16:08:35,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:08:35,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1196664391] [2022-03-20 16:08:35,181 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 16:08:35,181 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 16:08:35,181 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 16:08:35,181 INFO L85 PathProgramCache]: Analyzing trace with hash 176630919, now seen corresponding path program 22 times [2022-03-20 16:08:35,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:08:35,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295560124] [2022-03-20 16:08:35,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:08:35,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:08:35,187 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:08:35,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1489730500] [2022-03-20 16:08:35,187 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:08:35,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:08:35,187 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:08:35,190 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:08:35,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 16:08:35,246 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:08:35,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:08:35,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 16:08:35,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:08:35,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1146 backedges. 46 proven. 88 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2022-03-20 16:08:35,968 INFO L328 TraceCheckSpWp]: Computing backward predicates...