/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-19 21:59:46,380 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 21:59:46,382 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 21:59:46,412 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-19 21:59:46,412 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-19 21:59:46,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-19 21:59:46,414 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-19 21:59:46,415 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-19 21:59:46,416 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-19 21:59:46,416 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-19 21:59:46,417 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-19 21:59:46,418 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-19 21:59:46,418 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-19 21:59:46,419 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-19 21:59:46,436 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-19 21:59:46,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-19 21:59:46,437 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-19 21:59:46,438 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-19 21:59:46,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-19 21:59:46,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-19 21:59:46,442 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-19 21:59:46,443 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-19 21:59:46,444 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-19 21:59:46,444 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-19 21:59:46,445 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-19 21:59:46,446 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-19 21:59:46,446 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-19 21:59:46,447 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-19 21:59:46,447 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-19 21:59:46,447 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-19 21:59:46,448 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-19 21:59:46,448 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-19 21:59:46,449 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-19 21:59:46,449 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-19 21:59:46,449 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-19 21:59:46,450 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-19 21:59:46,450 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-19 21:59:46,450 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-19 21:59:46,451 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-19 21:59:46,451 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 21:59:46,451 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 21:59:46,458 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 21:59:46,458 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-03-19 21:59:46,480 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 21:59:46,481 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 21:59:46,481 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-19 21:59:46,481 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-19 21:59:46,482 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-19 21:59:46,482 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-19 21:59:46,482 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-19 21:59:46,482 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-19 21:59:46,482 INFO L138 SettingsManager]: * Use SBE=true [2022-03-19 21:59:46,483 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-19 21:59:46,483 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 21:59:46,484 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 21:59:46,484 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-19 21:59:46,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-19 21:59:46,485 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-19 21:59:46,485 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-19 21:59:46,485 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 21:59:46,485 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 21:59:46,680 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 21:59:46,695 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 21:59:46,697 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 21:59:46,698 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 21:59:46,698 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 21:59:46,699 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2022-03-19 21:59:46,735 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/807fa8452/72b91e9bd1634e0d8ddaa4e5df17d8f7/FLAGb1744df4f [2022-03-19 21:59:47,080 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 21:59:47,080 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2022-03-19 21:59:47,085 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/807fa8452/72b91e9bd1634e0d8ddaa4e5df17d8f7/FLAGb1744df4f [2022-03-19 21:59:47,516 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/807fa8452/72b91e9bd1634e0d8ddaa4e5df17d8f7 [2022-03-19 21:59:47,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 21:59:47,518 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 21:59:47,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 21:59:47,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 21:59:47,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 21:59:47,522 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,523 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@786168b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47, skipping insertion in model container [2022-03-19 21:59:47,523 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,555 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 21:59:47,564 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 21:59:47,659 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2022-03-19 21:59:47,690 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 21:59:47,694 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 21:59:47,705 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2022-03-19 21:59:47,710 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 21:59:47,718 INFO L208 MainTranslator]: Completed translation [2022-03-19 21:59:47,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47 WrapperNode [2022-03-19 21:59:47,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 21:59:47,720 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 21:59:47,720 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 21:59:47,720 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 21:59:47,727 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,727 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,731 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,731 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 21:59:47,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 21:59:47,740 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 21:59:47,740 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 21:59:47,741 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (1/1) ... [2022-03-19 21:59:47,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 21:59:47,762 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:47,776 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) [2022-03-19 21:59:47,807 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 [2022-03-19 21:59:47,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 21:59:47,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 21:59:47,827 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 21:59:47,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 21:59:47,827 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 21:59:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 21:59:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 21:59:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 21:59:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 21:59:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 21:59:47,887 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 21:59:47,889 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 21:59:47,986 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 21:59:47,990 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 21:59:47,990 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-19 21:59:47,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:59:47 BoogieIcfgContainer [2022-03-19 21:59:47,992 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 21:59:47,993 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 21:59:47,993 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 21:59:47,995 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 21:59:47,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 09:59:47" (1/3) ... [2022-03-19 21:59:47,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@555b9345 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:59:47, skipping insertion in model container [2022-03-19 21:59:47,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:59:47" (2/3) ... [2022-03-19 21:59:47,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@555b9345 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:59:47, skipping insertion in model container [2022-03-19 21:59:47,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:59:47" (3/3) ... [2022-03-19 21:59:47,997 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2022-03-19 21:59:48,001 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-19 21:59:48,001 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 21:59:48,031 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 21:59:48,043 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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 [2022-03-19 21:59:48,043 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 21:59:48,054 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 21:59:48,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 21:59:48,058 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:48,059 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:48,059 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:48,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:48,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1739069180, now seen corresponding path program 1 times [2022-03-19 21:59:48,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:48,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333446327] [2022-03-19 21:59:48,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:48,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:48,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:48,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:48,195 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:48,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333446327] [2022-03-19 21:59:48,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333446327] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 21:59:48,196 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 21:59:48,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 21:59:48,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744071240] [2022-03-19 21:59:48,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 21:59:48,201 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 21:59:48,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:48,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 21:59:48,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 21:59:48,221 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:48,267 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2022-03-19 21:59:48,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 21:59:48,268 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 21:59:48,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:48,272 INFO L225 Difference]: With dead ends: 51 [2022-03-19 21:59:48,273 INFO L226 Difference]: Without dead ends: 24 [2022-03-19 21:59:48,275 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 21:59:48,277 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:48,278 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 21:59:48,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-19 21:59:48,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-19 21:59:48,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 21:59:48,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-03-19 21:59:48,299 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-03-19 21:59:48,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:48,299 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-03-19 21:59:48,300 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,300 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-03-19 21:59:48,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 21:59:48,300 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:48,300 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:48,301 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 21:59:48,301 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:48,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:48,301 INFO L85 PathProgramCache]: Analyzing trace with hash 186732794, now seen corresponding path program 1 times [2022-03-19 21:59:48,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:48,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656692329] [2022-03-19 21:59:48,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:48,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:48,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:48,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:48,377 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:48,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656692329] [2022-03-19 21:59:48,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656692329] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 21:59:48,377 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 21:59:48,377 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 21:59:48,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255080088] [2022-03-19 21:59:48,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 21:59:48,379 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 21:59:48,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:48,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 21:59:48,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-19 21:59:48,381 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:48,460 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2022-03-19 21:59:48,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 21:59:48,461 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 21:59:48,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:48,463 INFO L225 Difference]: With dead ends: 44 [2022-03-19 21:59:48,463 INFO L226 Difference]: Without dead ends: 30 [2022-03-19 21:59:48,463 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-19 21:59:48,464 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:48,464 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 24 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 21:59:48,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-19 21:59:48,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2022-03-19 21:59:48,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 21:59:48,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-19 21:59:48,472 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-03-19 21:59:48,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:48,472 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-19 21:59:48,472 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,472 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-19 21:59:48,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 21:59:48,473 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:48,473 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:48,473 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 21:59:48,473 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:48,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:48,474 INFO L85 PathProgramCache]: Analyzing trace with hash -848440424, now seen corresponding path program 1 times [2022-03-19 21:59:48,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:48,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404763553] [2022-03-19 21:59:48,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:48,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:48,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:48,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 21:59:48,526 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:48,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404763553] [2022-03-19 21:59:48,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404763553] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 21:59:48,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 21:59:48,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 21:59:48,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983569284] [2022-03-19 21:59:48,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 21:59:48,527 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 21:59:48,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:48,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 21:59:48,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 21:59:48,528 INFO L87 Difference]: Start difference. First operand 25 states and 27 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:48,573 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-03-19 21:59:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 21:59:48,573 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-19 21:59:48,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:48,574 INFO L225 Difference]: With dead ends: 37 [2022-03-19 21:59:48,574 INFO L226 Difference]: Without dead ends: 26 [2022-03-19 21:59:48,574 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-19 21:59:48,575 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:48,576 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 27 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 21:59:48,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-19 21:59:48,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-19 21:59:48,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 21:59:48,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-03-19 21:59:48,580 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2022-03-19 21:59:48,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:48,580 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-03-19 21:59:48,580 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:48,581 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-03-19 21:59:48,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 21:59:48,581 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:48,581 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:48,581 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 21:59:48,581 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:48,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:48,582 INFO L85 PathProgramCache]: Analyzing trace with hash 689124982, now seen corresponding path program 1 times [2022-03-19 21:59:48,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:48,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751465840] [2022-03-19 21:59:48,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:48,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:48,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:48,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:48,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:48,967 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:48,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751465840] [2022-03-19 21:59:48,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751465840] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:48,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578548751] [2022-03-19 21:59:48,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:48,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:48,968 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:48,984 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) [2022-03-19 21:59:48,986 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 21:59:49,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:49,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-19 21:59:49,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:49,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-19 21:59:49,181 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2022-03-19 21:59:49,267 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-03-19 21:59:49,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:49,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:49,343 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-19 21:59:49,343 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-19 21:59:49,349 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-19 21:59:49,357 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-19 21:59:49,357 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-19 21:59:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:49,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578548751] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:49,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:49,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2022-03-19 21:59:49,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306856758] [2022-03-19 21:59:49,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:49,507 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 21:59:49,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:49,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 21:59:49,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-03-19 21:59:49,509 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:49,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:49,965 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2022-03-19 21:59:49,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 21:59:49,965 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 21:59:49,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:49,966 INFO L225 Difference]: With dead ends: 54 [2022-03-19 21:59:49,966 INFO L226 Difference]: Without dead ends: 52 [2022-03-19 21:59:49,967 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=287, Invalid=1119, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 21:59:49,967 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 74 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:49,968 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 71 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 21:59:49,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-19 21:59:49,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2022-03-19 21:59:49,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 21:59:49,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2022-03-19 21:59:49,973 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2022-03-19 21:59:49,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:49,973 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2022-03-19 21:59:49,973 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:49,974 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2022-03-19 21:59:49,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 21:59:49,974 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:49,974 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:49,996 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:50,188 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 [2022-03-19 21:59:50,188 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:50,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:50,189 INFO L85 PathProgramCache]: Analyzing trace with hash 369179156, now seen corresponding path program 2 times [2022-03-19 21:59:50,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:50,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340859972] [2022-03-19 21:59:50,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:50,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:50,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:50,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:50,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:50,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:50,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340859972] [2022-03-19 21:59:50,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340859972] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:50,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812846554] [2022-03-19 21:59:50,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 21:59:50,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:50,279 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:50,280 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) [2022-03-19 21:59:50,281 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 21:59:50,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 21:59:50,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 21:59:50,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 21:59:50,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:50,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:50,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:50,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:50,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812846554] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:50,397 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:50,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 7 [2022-03-19 21:59:50,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306609497] [2022-03-19 21:59:50,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:50,398 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-19 21:59:50,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:50,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-19 21:59:50,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-19 21:59:50,399 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:50,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:50,501 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2022-03-19 21:59:50,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 21:59:50,501 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-19 21:59:50,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:50,503 INFO L225 Difference]: With dead ends: 59 [2022-03-19 21:59:50,503 INFO L226 Difference]: Without dead ends: 48 [2022-03-19 21:59:50,503 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-03-19 21:59:50,505 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:50,506 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 46 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 21:59:50,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-19 21:59:50,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-19 21:59:50,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 21:59:50,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-03-19 21:59:50,524 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2022-03-19 21:59:50,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:50,525 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-03-19 21:59:50,525 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:50,525 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-03-19 21:59:50,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 21:59:50,525 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:50,525 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:50,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:50,742 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 [2022-03-19 21:59:50,742 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:50,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:50,743 INFO L85 PathProgramCache]: Analyzing trace with hash -1704530446, now seen corresponding path program 3 times [2022-03-19 21:59:50,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:50,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39444726] [2022-03-19 21:59:50,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:50,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:50,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:50,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:50,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:51,000 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:51,001 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:51,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39444726] [2022-03-19 21:59:51,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39444726] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:51,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094571892] [2022-03-19 21:59:51,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-19 21:59:51,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:51,001 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:51,002 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) [2022-03-19 21:59:51,003 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 21:59:51,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-03-19 21:59:51,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 21:59:51,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 21:59:51,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:51,064 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-19 21:59:51,221 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-03-19 21:59:51,257 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-19 21:59:51,338 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-19 21:59:51,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-19 21:59:51,373 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:51,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:52,666 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 108 [2022-03-19 21:59:52,674 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-19 21:59:52,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 201 treesize of output 179 [2022-03-19 21:59:52,869 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:52,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094571892] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:52,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:52,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 35 [2022-03-19 21:59:52,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265020574] [2022-03-19 21:59:52,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:52,870 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-19 21:59:52,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:52,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-19 21:59:52,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1047, Unknown=2, NotChecked=0, Total=1190 [2022-03-19 21:59:52,871 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:53,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:53,833 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2022-03-19 21:59:53,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 21:59:53,833 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-19 21:59:53,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:53,835 INFO L225 Difference]: With dead ends: 80 [2022-03-19 21:59:53,835 INFO L226 Difference]: Without dead ends: 78 [2022-03-19 21:59:53,836 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=560, Invalid=3098, Unknown=2, NotChecked=0, Total=3660 [2022-03-19 21:59:53,837 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 88 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:53,837 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 94 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 691 Invalid, 0 Unknown, 53 Unchecked, 0.3s Time] [2022-03-19 21:59:53,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-19 21:59:53,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 46. [2022-03-19 21:59:53,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 21:59:53,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-19 21:59:53,843 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2022-03-19 21:59:53,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:53,845 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-19 21:59:53,845 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:53,845 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-19 21:59:53,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 21:59:53,846 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:53,846 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:53,863 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:54,063 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 [2022-03-19 21:59:54,063 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:54,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:54,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1823608176, now seen corresponding path program 4 times [2022-03-19 21:59:54,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:54,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93239397] [2022-03-19 21:59:54,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:54,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:54,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:54,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:54,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:54,115 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:54,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:54,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93239397] [2022-03-19 21:59:54,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93239397] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:54,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469527661] [2022-03-19 21:59:54,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 21:59:54,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:54,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:54,117 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) [2022-03-19 21:59:54,118 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 21:59:54,154 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 21:59:54,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 21:59:54,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 21:59:54,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:54,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-19 21:59:54,257 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-19 21:59:54,409 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-19 21:59:54,410 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-19 21:59:54,445 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-19 21:59:54,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:54,538 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-19 21:59:54,538 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-19 21:59:54,548 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-19 21:59:54,549 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-19 21:59:54,554 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-19 21:59:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-19 21:59:54,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469527661] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:54,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:54,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-03-19 21:59:54,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190286168] [2022-03-19 21:59:54,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:54,639 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 21:59:54,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:54,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 21:59:54,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-03-19 21:59:54,640 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:56,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:56,208 INFO L93 Difference]: Finished difference Result 125 states and 144 transitions. [2022-03-19 21:59:56,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-19 21:59:56,208 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 21:59:56,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:56,209 INFO L225 Difference]: With dead ends: 125 [2022-03-19 21:59:56,209 INFO L226 Difference]: Without dead ends: 111 [2022-03-19 21:59:56,210 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1390 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2022-03-19 21:59:56,211 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 104 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 930 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:56,211 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 76 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 930 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 21:59:56,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-19 21:59:56,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 71. [2022-03-19 21:59:56,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 62 states have internal predecessors, (69), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-19 21:59:56,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-03-19 21:59:56,230 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 27 [2022-03-19 21:59:56,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:56,230 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-03-19 21:59:56,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:56,230 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-03-19 21:59:56,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 21:59:56,232 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:56,232 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:56,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:56,451 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 [2022-03-19 21:59:56,451 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:56,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:56,452 INFO L85 PathProgramCache]: Analyzing trace with hash 463472720, now seen corresponding path program 1 times [2022-03-19 21:59:56,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:56,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363856482] [2022-03-19 21:59:56,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:56,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:56,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:56,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:56,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:56,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-19 21:59:56,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:56,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 21:59:56,548 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:56,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363856482] [2022-03-19 21:59:56,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363856482] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:56,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711686688] [2022-03-19 21:59:56,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:56,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:56,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:56,549 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) [2022-03-19 21:59:56,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 21:59:56,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:56,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 21:59:56,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:56,656 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 21:59:56,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:56,703 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 21:59:56,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711686688] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:56,703 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:56,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 12 [2022-03-19 21:59:56,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783696893] [2022-03-19 21:59:56,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:56,704 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 21:59:56,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:56,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 21:59:56,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-19 21:59:56,704 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-19 21:59:56,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:56,879 INFO L93 Difference]: Finished difference Result 111 states and 129 transitions. [2022-03-19 21:59:56,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 21:59:56,879 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-03-19 21:59:56,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:56,880 INFO L225 Difference]: With dead ends: 111 [2022-03-19 21:59:56,880 INFO L226 Difference]: Without dead ends: 75 [2022-03-19 21:59:56,881 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2022-03-19 21:59:56,881 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 49 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:56,881 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 47 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 21:59:56,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-19 21:59:56,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2022-03-19 21:59:56,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 58 states have internal predecessors, (63), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-19 21:59:56,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2022-03-19 21:59:56,892 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 29 [2022-03-19 21:59:56,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:56,892 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2022-03-19 21:59:56,892 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-19 21:59:56,892 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2022-03-19 21:59:56,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 21:59:56,893 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:56,893 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 21:59:56,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:57,109 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 [2022-03-19 21:59:57,110 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:57,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:57,110 INFO L85 PathProgramCache]: Analyzing trace with hash -1154270004, now seen corresponding path program 5 times [2022-03-19 21:59:57,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:57,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733461660] [2022-03-19 21:59:57,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:57,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:57,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:57,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 21:59:57,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 21:59:57,188 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:57,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 21:59:57,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733461660] [2022-03-19 21:59:57,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733461660] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 21:59:57,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089377202] [2022-03-19 21:59:57,188 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-19 21:59:57,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 21:59:57,188 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 21:59:57,189 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) [2022-03-19 21:59:57,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 21:59:57,240 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-03-19 21:59:57,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 21:59:57,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 21:59:57,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 21:59:57,285 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:57,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 21:59:57,336 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 21:59:57,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089377202] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 21:59:57,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 21:59:57,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 10 [2022-03-19 21:59:57,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063006374] [2022-03-19 21:59:57,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 21:59:57,337 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 21:59:57,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 21:59:57,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 21:59:57,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2022-03-19 21:59:57,337 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:57,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 21:59:57,507 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2022-03-19 21:59:57,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 21:59:57,507 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-19 21:59:57,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 21:59:57,508 INFO L225 Difference]: With dead ends: 128 [2022-03-19 21:59:57,508 INFO L226 Difference]: Without dead ends: 106 [2022-03-19 21:59:57,508 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2022-03-19 21:59:57,509 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 78 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 21:59:57,509 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 32 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 21:59:57,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-19 21:59:57,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 75. [2022-03-19 21:59:57,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 66 states have internal predecessors, (70), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-19 21:59:57,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2022-03-19 21:59:57,531 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 31 [2022-03-19 21:59:57,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 21:59:57,532 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2022-03-19 21:59:57,532 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 21:59:57,532 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2022-03-19 21:59:57,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 21:59:57,533 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 21:59:57,533 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-19 21:59:57,551 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 21:59:57,739 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 [2022-03-19 21:59:57,740 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 21:59:57,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 21:59:57,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1181909964, now seen corresponding path program 2 times [2022-03-19 21:59:57,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 21:59:57,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603336130] [2022-03-19 21:59:57,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 21:59:57,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 21:59:57,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 21:59:57,759 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 21:59:57,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 21:59:57,781 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 21:59:57,781 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-03-19 21:59:57,781 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-19 21:59:57,783 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-19 21:59:57,784 INFO L719 BasicCegarLoop]: Path program histogram: [5, 2, 1, 1, 1] [2022-03-19 21:59:57,786 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-19 21:59:57,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.03 09:59:57 BoogieIcfgContainer [2022-03-19 21:59:57,803 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-19 21:59:57,803 INFO L158 Benchmark]: Toolchain (without parser) took 10285.13ms. Allocated memory was 206.6MB in the beginning and 401.6MB in the end (delta: 195.0MB). Free memory was 149.7MB in the beginning and 238.0MB in the end (delta: -88.3MB). Peak memory consumption was 106.3MB. Max. memory is 8.0GB. [2022-03-19 21:59:57,803 INFO L158 Benchmark]: CDTParser took 0.11ms. Allocated memory is still 206.6MB. Free memory is still 165.6MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-19 21:59:57,804 INFO L158 Benchmark]: CACSL2BoogieTranslator took 199.73ms. Allocated memory was 206.6MB in the beginning and 321.9MB in the end (delta: 115.3MB). Free memory was 149.4MB in the beginning and 293.2MB in the end (delta: -143.8MB). Peak memory consumption was 6.7MB. Max. memory is 8.0GB. [2022-03-19 21:59:57,804 INFO L158 Benchmark]: Boogie Preprocessor took 20.11ms. Allocated memory is still 321.9MB. Free memory was 293.2MB in the beginning and 291.3MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-19 21:59:57,804 INFO L158 Benchmark]: RCFGBuilder took 251.59ms. Allocated memory is still 321.9MB. Free memory was 291.3MB in the beginning and 280.6MB in the end (delta: 10.7MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-03-19 21:59:57,804 INFO L158 Benchmark]: TraceAbstraction took 9810.21ms. Allocated memory was 321.9MB in the beginning and 401.6MB in the end (delta: 79.7MB). Free memory was 279.8MB in the beginning and 238.0MB in the end (delta: 41.8MB). Peak memory consumption was 122.9MB. Max. memory is 8.0GB. [2022-03-19 21:59:57,805 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11ms. Allocated memory is still 206.6MB. Free memory is still 165.6MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 199.73ms. Allocated memory was 206.6MB in the beginning and 321.9MB in the end (delta: 115.3MB). Free memory was 149.4MB in the beginning and 293.2MB in the end (delta: -143.8MB). Peak memory consumption was 6.7MB. Max. memory is 8.0GB. * Boogie Preprocessor took 20.11ms. Allocated memory is still 321.9MB. Free memory was 293.2MB in the beginning and 291.3MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 251.59ms. Allocated memory is still 321.9MB. Free memory was 291.3MB in the beginning and 280.6MB in the end (delta: 10.7MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 9810.21ms. Allocated memory was 321.9MB in the beginning and 401.6MB in the end (delta: 79.7MB). Free memory was 279.8MB in the beginning and 238.0MB in the end (delta: 41.8MB). Peak memory consumption was 122.9MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={5:0}, str2={4:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L35] COND TRUE i