/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/float-benchs/feedback_diverge.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 10:47:20,417 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 10:47:20,419 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 10:47:20,449 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 10:47:20,449 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 10:47:20,451 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 10:47:20,455 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 10:47:20,457 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 10:47:20,458 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 10:47:20,461 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 10:47:20,461 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 10:47:20,462 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 10:47:20,462 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 10:47:20,462 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 10:47:20,463 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 10:47:20,464 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 10:47:20,464 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 10:47:20,464 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 10:47:20,465 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 10:47:20,466 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 10:47:20,467 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 10:47:20,469 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 10:47:20,470 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 10:47:20,471 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 10:47:20,481 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 10:47:20,481 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 10:47:20,481 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 10:47:20,482 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 10:47:20,482 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 10:47:20,482 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 10:47:20,483 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 10:47:20,483 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 10:47:20,483 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 10:47:20,484 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 10:47:20,484 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 10:47:20,484 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 10:47:20,485 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 10:47:20,485 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 10:47:20,485 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 10:47:20,486 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 10:47:20,486 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 10:47:20,488 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 10:47:20,511 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 10:47:20,511 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 10:47:20,511 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 10:47:20,511 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 10:47:20,512 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 10:47:20,512 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 10:47:20,512 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 10:47:20,512 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 10:47:20,512 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 10:47:20,512 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 10:47:20,513 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 10:47:20,513 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 10:47:20,514 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 10:47:20,514 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 10:47:20,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:47:20,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 10:47:20,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 10:47:20,516 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 10:47:20,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 10:47:20,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 10:47:20,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 10:47:20,516 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 10:47:20,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 10:47:20,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 10:47:20,721 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 10:47:20,722 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 10:47:20,722 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 10:47:20,722 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/float-benchs/feedback_diverge.c [2023-04-01 10:47:21,838 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 10:47:21,951 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 10:47:21,952 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/float-benchs/feedback_diverge.c [2023-04-01 10:47:21,956 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61555fe7f/d96ea8e406d343b8beed7fd921a19b46/FLAGda5aa5c55 [2023-04-01 10:47:21,969 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61555fe7f/d96ea8e406d343b8beed7fd921a19b46 [2023-04-01 10:47:21,971 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 10:47:21,972 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 10:47:21,974 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 10:47:21,975 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 10:47:21,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 10:47:21,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:47:21" (1/1) ... [2023-04-01 10:47:21,979 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3afe5012 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:21, skipping insertion in model container [2023-04-01 10:47:21,979 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:47:21" (1/1) ... [2023-04-01 10:47:21,983 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 10:47:21,994 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 10:47:22,108 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/float-benchs/feedback_diverge.c[626,639] [2023-04-01 10:47:22,122 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:47:22,130 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 10:47:22,139 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/float-benchs/feedback_diverge.c[626,639] [2023-04-01 10:47:22,145 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:47:22,155 INFO L208 MainTranslator]: Completed translation [2023-04-01 10:47:22,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22 WrapperNode [2023-04-01 10:47:22,155 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 10:47:22,156 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 10:47:22,157 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 10:47:22,157 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 10:47:22,164 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,164 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,169 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,169 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,179 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,183 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,184 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,185 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,190 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 10:47:22,191 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 10:47:22,191 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 10:47:22,191 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 10:47:22,192 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (1/1) ... [2023-04-01 10:47:22,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:47:22,204 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:22,242 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) [2023-04-01 10:47:22,300 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 [2023-04-01 10:47:22,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 10:47:22,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 10:47:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 10:47:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 10:47:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 10:47:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure wait_for_clock [2023-04-01 10:47:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 10:47:22,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_float [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure wait_for_clock [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 10:47:22,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 10:47:22,376 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 10:47:22,378 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 10:47:22,522 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 10:47:22,536 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 10:47:22,551 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 10:47:22,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:47:22 BoogieIcfgContainer [2023-04-01 10:47:22,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 10:47:22,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 10:47:22,555 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 10:47:22,557 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 10:47:22,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 10:47:21" (1/3) ... [2023-04-01 10:47:22,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b2c5b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:47:22, skipping insertion in model container [2023-04-01 10:47:22,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:47:22" (2/3) ... [2023-04-01 10:47:22,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b2c5b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:47:22, skipping insertion in model container [2023-04-01 10:47:22,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:47:22" (3/3) ... [2023-04-01 10:47:22,559 INFO L112 eAbstractionObserver]: Analyzing ICFG feedback_diverge.c [2023-04-01 10:47:22,587 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 10:47:22,587 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 10:47:22,652 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 10:47:22,656 INFO L357 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=FINITE_AUTOMATA, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@52a9b12a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 10:47:22,656 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 10:47:22,659 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 10:47:22,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 10:47:22,663 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:22,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:22,664 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:22,669 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:22,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1853831179, now seen corresponding path program 1 times [2023-04-01 10:47:22,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:22,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566726732] [2023-04-01 10:47:22,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:22,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:22,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:22,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:47:22,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:22,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566726732] [2023-04-01 10:47:22,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566726732] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:47:22,873 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:47:22,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 10:47:22,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409980433] [2023-04-01 10:47:22,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:47:22,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 10:47:22,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:22,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 10:47:22,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 10:47:22,935 INFO L87 Difference]: Start difference. First operand has 26 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 10:47:22,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:22,983 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2023-04-01 10:47:22,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 10:47:22,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-04-01 10:47:22,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:22,989 INFO L225 Difference]: With dead ends: 43 [2023-04-01 10:47:22,989 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 10:47:22,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 10:47:22,994 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:22,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 41 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 10:47:23,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 10:47:23,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2023-04-01 10:47:23,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 10:47:23,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2023-04-01 10:47:23,022 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 10 [2023-04-01 10:47:23,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:23,023 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2023-04-01 10:47:23,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 10:47:23,024 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2023-04-01 10:47:23,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 10:47:23,025 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:23,025 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:23,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 10:47:23,025 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:23,027 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:23,027 INFO L85 PathProgramCache]: Analyzing trace with hash 383234773, now seen corresponding path program 1 times [2023-04-01 10:47:23,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:23,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844765241] [2023-04-01 10:47:23,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:23,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:23,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:47:23,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:23,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844765241] [2023-04-01 10:47:23,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844765241] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:23,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683509869] [2023-04-01 10:47:23,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:23,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:23,094 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:23,097 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) [2023-04-01 10:47:23,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 10:47:23,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:23,140 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 10:47:23,145 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:47:23,187 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:23,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:47:23,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683509869] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:23,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [565462487] [2023-04-01 10:47:23,247 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:23,247 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:23,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:23,253 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:23,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:23,397 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:24,014 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:24,031 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:24,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:24,037 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:24,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '230#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:24,796 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:24,796 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:24,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 10:47:24,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960093607] [2023-04-01 10:47:24,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:24,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 10:47:24,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:24,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 10:47:24,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2023-04-01 10:47:24,801 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 10:47:24,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:24,834 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2023-04-01 10:47:24,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 10:47:24,834 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 17 [2023-04-01 10:47:24,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:24,836 INFO L225 Difference]: With dead ends: 44 [2023-04-01 10:47:24,836 INFO L226 Difference]: Without dead ends: 39 [2023-04-01 10:47:24,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2023-04-01 10:47:24,840 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 13 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:24,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 45 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 10:47:24,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-04-01 10:47:24,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-04-01 10:47:24,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 28 states have internal predecessors, (29), 11 states have call successors, (11), 5 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 10:47:24,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 49 transitions. [2023-04-01 10:47:24,853 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 49 transitions. Word has length 17 [2023-04-01 10:47:24,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:24,853 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 49 transitions. [2023-04-01 10:47:24,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 10:47:24,854 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 49 transitions. [2023-04-01 10:47:24,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 10:47:24,856 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:24,857 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:24,877 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 10:47:25,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:25,061 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:25,061 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:25,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1597911051, now seen corresponding path program 2 times [2023-04-01 10:47:25,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:25,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031415627] [2023-04-01 10:47:25,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:25,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:25,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:25,153 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 10:47:25,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:25,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031415627] [2023-04-01 10:47:25,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031415627] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:25,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556630499] [2023-04-01 10:47:25,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 10:47:25,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:25,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:25,155 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) [2023-04-01 10:47:25,157 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 10:47:25,191 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-01 10:47:25,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 10:47:25,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 10:47:25,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:25,221 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 10:47:25,221 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:25,274 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 10:47:25,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556630499] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:25,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2048458085] [2023-04-01 10:47:25,275 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:25,275 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:25,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:25,276 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:25,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:25,299 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:25,585 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:25,593 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:25,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:25,597 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:26,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '606#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:26,230 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:26,230 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:26,230 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-01 10:47:26,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007612342] [2023-04-01 10:47:26,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:26,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 10:47:26,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:26,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 10:47:26,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2023-04-01 10:47:26,233 INFO L87 Difference]: Start difference. First operand 39 states and 49 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 10:47:26,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:26,293 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2023-04-01 10:47:26,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 10:47:26,293 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 38 [2023-04-01 10:47:26,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:26,295 INFO L225 Difference]: With dead ends: 80 [2023-04-01 10:47:26,295 INFO L226 Difference]: Without dead ends: 75 [2023-04-01 10:47:26,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2023-04-01 10:47:26,298 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:26,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 76 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 10:47:26,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-04-01 10:47:26,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2023-04-01 10:47:26,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 58 states have internal predecessors, (59), 23 states have call successors, (23), 5 states have call predecessors, (23), 3 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-01 10:47:26,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 103 transitions. [2023-04-01 10:47:26,320 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 103 transitions. Word has length 38 [2023-04-01 10:47:26,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:26,320 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 103 transitions. [2023-04-01 10:47:26,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 10:47:26,320 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 103 transitions. [2023-04-01 10:47:26,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2023-04-01 10:47:26,326 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:26,326 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:26,333 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 10:47:26,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 10:47:26,531 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:26,531 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:26,531 INFO L85 PathProgramCache]: Analyzing trace with hash -619258891, now seen corresponding path program 3 times [2023-04-01 10:47:26,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:26,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961621724] [2023-04-01 10:47:26,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:26,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:26,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:26,743 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-01 10:47:26,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:26,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961621724] [2023-04-01 10:47:26,743 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961621724] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:26,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147041049] [2023-04-01 10:47:26,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 10:47:26,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:26,743 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:26,744 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) [2023-04-01 10:47:26,746 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 10:47:26,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 10:47:26,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 10:47:26,792 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 10:47:26,794 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:26,847 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-01 10:47:26,847 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:27,034 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-01 10:47:27,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147041049] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:27,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426587559] [2023-04-01 10:47:27,035 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:27,035 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:27,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:27,035 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:27,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:27,053 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:27,272 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:27,281 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:27,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:27,285 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:27,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1354#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:27,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:27,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:27,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-01 10:47:27,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183379241] [2023-04-01 10:47:27,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:27,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 10:47:27,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:27,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 10:47:27,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=922, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 10:47:27,994 INFO L87 Difference]: Start difference. First operand 75 states and 103 transitions. Second operand has 25 states, 25 states have (on average 3.76) internal successors, (94), 25 states have internal predecessors, (94), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-01 10:47:28,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:28,134 INFO L93 Difference]: Finished difference Result 152 states and 227 transitions. [2023-04-01 10:47:28,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 10:47:28,135 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 25 states have internal predecessors, (94), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 80 [2023-04-01 10:47:28,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:28,137 INFO L225 Difference]: With dead ends: 152 [2023-04-01 10:47:28,137 INFO L226 Difference]: Without dead ends: 147 [2023-04-01 10:47:28,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=338, Invalid=922, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 10:47:28,139 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 81 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:28,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 119 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 10:47:28,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2023-04-01 10:47:28,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2023-04-01 10:47:28,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 96 states have (on average 1.2395833333333333) internal successors, (119), 118 states have internal predecessors, (119), 47 states have call successors, (47), 5 states have call predecessors, (47), 3 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2023-04-01 10:47:28,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 211 transitions. [2023-04-01 10:47:28,167 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 211 transitions. Word has length 80 [2023-04-01 10:47:28,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:28,167 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 211 transitions. [2023-04-01 10:47:28,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 25 states have internal predecessors, (94), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-01 10:47:28,167 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 211 transitions. [2023-04-01 10:47:28,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2023-04-01 10:47:28,169 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:28,169 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:28,177 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 10:47:28,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:28,375 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:28,375 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:28,375 INFO L85 PathProgramCache]: Analyzing trace with hash 391377909, now seen corresponding path program 4 times [2023-04-01 10:47:28,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:28,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429460659] [2023-04-01 10:47:28,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:28,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:28,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:29,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1639 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-04-01 10:47:29,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:29,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429460659] [2023-04-01 10:47:29,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429460659] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:29,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713801210] [2023-04-01 10:47:29,104 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 10:47:29,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:29,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:29,105 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) [2023-04-01 10:47:29,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 10:47:29,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:29,174 INFO L262 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 10:47:29,184 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1639 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-04-01 10:47:29,294 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:29,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1639 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-04-01 10:47:29,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713801210] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:29,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1360605206] [2023-04-01 10:47:29,890 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:29,891 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:29,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:29,891 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:29,891 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:29,910 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:30,166 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:30,174 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:30,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:30,178 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:30,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2846#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:30,740 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:30,740 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:30,740 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-01 10:47:30,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798474923] [2023-04-01 10:47:30,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:30,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 10:47:30,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:30,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 10:47:30,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1214, Invalid=2326, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 10:47:30,743 INFO L87 Difference]: Start difference. First operand 147 states and 211 transitions. Second operand has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 49 states have internal predecessors, (190), 47 states have call successors, (48), 2 states have call predecessors, (48), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-01 10:47:31,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:31,053 INFO L93 Difference]: Finished difference Result 296 states and 455 transitions. [2023-04-01 10:47:31,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-01 10:47:31,054 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 49 states have internal predecessors, (190), 47 states have call successors, (48), 2 states have call predecessors, (48), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) Word has length 164 [2023-04-01 10:47:31,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:31,056 INFO L225 Difference]: With dead ends: 296 [2023-04-01 10:47:31,056 INFO L226 Difference]: Without dead ends: 291 [2023-04-01 10:47:31,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 458 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 861 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1214, Invalid=2326, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 10:47:31,057 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 138 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:31,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 211 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 10:47:31,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2023-04-01 10:47:31,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 291. [2023-04-01 10:47:31,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 192 states have (on average 1.2447916666666667) internal successors, (239), 238 states have internal predecessors, (239), 95 states have call successors, (95), 5 states have call predecessors, (95), 3 states have return successors, (93), 93 states have call predecessors, (93), 93 states have call successors, (93) [2023-04-01 10:47:31,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 427 transitions. [2023-04-01 10:47:31,068 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 427 transitions. Word has length 164 [2023-04-01 10:47:31,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:31,069 INFO L495 AbstractCegarLoop]: Abstraction has 291 states and 427 transitions. [2023-04-01 10:47:31,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 49 states have internal predecessors, (190), 47 states have call successors, (48), 2 states have call predecessors, (48), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-01 10:47:31,069 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 427 transitions. [2023-04-01 10:47:31,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2023-04-01 10:47:31,073 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:31,073 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 46, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:31,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 10:47:31,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:31,297 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:31,298 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:31,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1424350219, now seen corresponding path program 5 times [2023-04-01 10:47:31,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:31,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720457586] [2023-04-01 10:47:31,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:31,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:31,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:32,825 INFO L134 CoverageAnalysis]: Checked inductivity of 7291 backedges. 0 proven. 5221 refuted. 0 times theorem prover too weak. 2070 trivial. 0 not checked. [2023-04-01 10:47:32,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:32,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720457586] [2023-04-01 10:47:32,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720457586] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:32,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023948055] [2023-04-01 10:47:32,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 10:47:32,826 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:32,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:32,827 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) [2023-04-01 10:47:32,842 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 10:47:32,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2023-04-01 10:47:32,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 10:47:32,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 10:47:32,995 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:33,199 INFO L134 CoverageAnalysis]: Checked inductivity of 7291 backedges. 0 proven. 5221 refuted. 0 times theorem prover too weak. 2070 trivial. 0 not checked. [2023-04-01 10:47:33,200 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:35,087 INFO L134 CoverageAnalysis]: Checked inductivity of 7291 backedges. 0 proven. 5221 refuted. 0 times theorem prover too weak. 2070 trivial. 0 not checked. [2023-04-01 10:47:35,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023948055] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:35,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1603928682] [2023-04-01 10:47:35,089 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:35,089 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:35,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:35,089 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:35,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:35,105 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:35,323 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:35,332 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:35,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:35,336 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:36,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5826#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:36,238 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:36,238 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:36,238 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2023-04-01 10:47:36,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035327490] [2023-04-01 10:47:36,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:36,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-01 10:47:36,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:36,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-01 10:47:36,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4694, Invalid=6862, Unknown=0, NotChecked=0, Total=11556 [2023-04-01 10:47:36,244 INFO L87 Difference]: Start difference. First operand 291 states and 427 transitions. Second operand has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 97 states have internal predecessors, (382), 95 states have call successors, (96), 2 states have call predecessors, (96), 1 states have return successors, (94), 94 states have call predecessors, (94), 94 states have call successors, (94) [2023-04-01 10:47:37,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:47:37,321 INFO L93 Difference]: Finished difference Result 584 states and 911 transitions. [2023-04-01 10:47:37,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-04-01 10:47:37,322 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 97 states have internal predecessors, (382), 95 states have call successors, (96), 2 states have call predecessors, (96), 1 states have return successors, (94), 94 states have call predecessors, (94), 94 states have call successors, (94) Word has length 332 [2023-04-01 10:47:37,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:47:37,330 INFO L225 Difference]: With dead ends: 584 [2023-04-01 10:47:37,330 INFO L226 Difference]: Without dead ends: 579 [2023-04-01 10:47:37,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1044 GetRequests, 938 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4694, Invalid=6862, Unknown=0, NotChecked=0, Total=11556 [2023-04-01 10:47:37,333 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 332 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 10:47:37,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [428 Valid, 348 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 10:47:37,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2023-04-01 10:47:37,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 579. [2023-04-01 10:47:37,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 579 states, 384 states have (on average 1.2473958333333333) internal successors, (479), 478 states have internal predecessors, (479), 191 states have call successors, (191), 5 states have call predecessors, (191), 3 states have return successors, (189), 189 states have call predecessors, (189), 189 states have call successors, (189) [2023-04-01 10:47:37,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 579 states to 579 states and 859 transitions. [2023-04-01 10:47:37,393 INFO L78 Accepts]: Start accepts. Automaton has 579 states and 859 transitions. Word has length 332 [2023-04-01 10:47:37,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:47:37,395 INFO L495 AbstractCegarLoop]: Abstraction has 579 states and 859 transitions. [2023-04-01 10:47:37,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 97 states have internal predecessors, (382), 95 states have call successors, (96), 2 states have call predecessors, (96), 1 states have return successors, (94), 94 states have call predecessors, (94), 94 states have call successors, (94) [2023-04-01 10:47:37,395 INFO L276 IsEmpty]: Start isEmpty. Operand 579 states and 859 transitions. [2023-04-01 10:47:37,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 669 [2023-04-01 10:47:37,437 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:47:37,437 INFO L195 NwaCegarLoop]: trace histogram [94, 94, 94, 94, 94, 94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:47:37,447 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 10:47:37,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:37,644 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:47:37,644 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:47:37,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1479113739, now seen corresponding path program 6 times [2023-04-01 10:47:37,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:47:37,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371372902] [2023-04-01 10:47:37,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:47:37,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:47:37,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:47:43,960 INFO L134 CoverageAnalysis]: Checked inductivity of 30691 backedges. 0 proven. 21949 refuted. 0 times theorem prover too weak. 8742 trivial. 0 not checked. [2023-04-01 10:47:43,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:47:43,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371372902] [2023-04-01 10:47:43,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371372902] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:47:43,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701973787] [2023-04-01 10:47:43,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 10:47:43,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:47:43,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:47:43,962 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) [2023-04-01 10:47:43,965 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 10:47:44,146 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 10:47:44,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 10:47:44,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 1558 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-01 10:47:44,163 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:47:44,647 INFO L134 CoverageAnalysis]: Checked inductivity of 30691 backedges. 0 proven. 21949 refuted. 0 times theorem prover too weak. 8742 trivial. 0 not checked. [2023-04-01 10:47:44,647 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:47:53,766 INFO L134 CoverageAnalysis]: Checked inductivity of 30691 backedges. 0 proven. 21949 refuted. 0 times theorem prover too weak. 8742 trivial. 0 not checked. [2023-04-01 10:47:53,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701973787] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:47:53,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862186338] [2023-04-01 10:47:53,768 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 10:47:53,768 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:47:53,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:47:53,768 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:47:53,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:47:53,784 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 10:47:53,962 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2023-04-01 10:47:53,970 INFO L197 IcfgInterpreter]: Interpreting procedure wait_for_clock with input of size 43 for LOIs [2023-04-01 10:47:53,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:47:53,973 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:47:55,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11782#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 10:47:55,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:47:55,123 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:47:55,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2023-04-01 10:47:55,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999129145] [2023-04-01 10:47:55,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:47:55,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-04-01 10:47:55,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:47:55,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-04-01 10:47:55,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18566, Invalid=22846, Unknown=0, NotChecked=0, Total=41412 [2023-04-01 10:47:55,135 INFO L87 Difference]: Start difference. First operand 579 states and 859 transitions. Second operand has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 193 states have internal predecessors, (766), 191 states have call successors, (192), 2 states have call predecessors, (192), 1 states have return successors, (190), 190 states have call predecessors, (190), 190 states have call successors, (190) [2023-04-01 10:48:02,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:48:02,842 INFO L93 Difference]: Finished difference Result 1160 states and 1823 transitions. [2023-04-01 10:48:02,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2023-04-01 10:48:02,843 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 193 states have internal predecessors, (766), 191 states have call successors, (192), 2 states have call predecessors, (192), 1 states have return successors, (190), 190 states have call predecessors, (190), 190 states have call successors, (190) Word has length 668 [2023-04-01 10:48:02,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:48:02,849 INFO L225 Difference]: With dead ends: 1160 [2023-04-01 10:48:02,849 INFO L226 Difference]: Without dead ends: 1155 [2023-04-01 10:48:02,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2100 GetRequests, 1898 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3525 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=18566, Invalid=22846, Unknown=0, NotChecked=0, Total=41412 [2023-04-01 10:48:02,852 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1004 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 775 mSolverCounterSat, 810 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1196 SdHoareTripleChecker+Valid, 616 SdHoareTripleChecker+Invalid, 1585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 810 IncrementalHoareTripleChecker+Valid, 775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-01 10:48:02,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1196 Valid, 616 Invalid, 1585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [810 Valid, 775 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-01 10:48:02,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1155 states. [2023-04-01 10:48:02,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1155 to 1155. [2023-04-01 10:48:02,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1155 states, 768 states have (on average 1.2486979166666667) internal successors, (959), 958 states have internal predecessors, (959), 383 states have call successors, (383), 5 states have call predecessors, (383), 3 states have return successors, (381), 381 states have call predecessors, (381), 381 states have call successors, (381) [2023-04-01 10:48:02,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1155 states to 1155 states and 1723 transitions. [2023-04-01 10:48:02,880 INFO L78 Accepts]: Start accepts. Automaton has 1155 states and 1723 transitions. Word has length 668 [2023-04-01 10:48:02,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:48:02,881 INFO L495 AbstractCegarLoop]: Abstraction has 1155 states and 1723 transitions. [2023-04-01 10:48:02,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 193 states have internal predecessors, (766), 191 states have call successors, (192), 2 states have call predecessors, (192), 1 states have return successors, (190), 190 states have call predecessors, (190), 190 states have call successors, (190) [2023-04-01 10:48:02,882 INFO L276 IsEmpty]: Start isEmpty. Operand 1155 states and 1723 transitions. [2023-04-01 10:48:02,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1341 [2023-04-01 10:48:02,894 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:48:02,894 INFO L195 NwaCegarLoop]: trace histogram [190, 190, 190, 190, 190, 190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:48:02,901 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 10:48:03,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:48:03,101 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:48:03,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:48:03,101 INFO L85 PathProgramCache]: Analyzing trace with hash 906970101, now seen corresponding path program 7 times [2023-04-01 10:48:03,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:48:03,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291072539] [2023-04-01 10:48:03,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:48:03,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:48:03,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:48:31,605 INFO L134 CoverageAnalysis]: Checked inductivity of 125875 backedges. 0 proven. 89965 refuted. 0 times theorem prover too weak. 35910 trivial. 0 not checked. [2023-04-01 10:48:31,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:48:31,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291072539] [2023-04-01 10:48:31,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291072539] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:48:31,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365211028] [2023-04-01 10:48:31,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 10:48:31,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:48:31,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:48:31,606 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:48:31,608 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 10:48:32,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:48:32,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 3094 conjuncts, 192 conjunts are in the unsatisfiable core [2023-04-01 10:48:32,037 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:48:33,100 INFO L134 CoverageAnalysis]: Checked inductivity of 125875 backedges. 0 proven. 89965 refuted. 0 times theorem prover too weak. 35910 trivial. 0 not checked. [2023-04-01 10:48:33,100 INFO L327 TraceCheckSpWp]: Computing backward predicates...