/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 OctagonDomain -i ../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 05:06:46,468 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 05:06:46,470 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 05:06:46,506 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 05:06:46,507 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 05:06:46,509 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 05:06:46,512 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 05:06:46,514 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 05:06:46,515 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 05:06:46,520 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 05:06:46,521 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 05:06:46,523 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 05:06:46,523 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 05:06:46,525 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 05:06:46,526 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 05:06:46,527 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 05:06:46,528 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 05:06:46,529 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 05:06:46,530 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 05:06:46,535 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 05:06:46,536 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 05:06:46,537 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 05:06:46,538 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 05:06:46,539 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 05:06:46,547 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 05:06:46,547 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 05:06:46,547 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 05:06:46,548 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 05:06:46,549 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 05:06:46,549 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 05:06:46,549 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 05:06:46,550 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 05:06:46,551 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 05:06:46,552 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 05:06:46,553 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 05:06:46,553 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 05:06:46,553 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 05:06:46,554 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 05:06:46,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 05:06:46,554 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 05:06:46,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 05:06:46,556 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 05:06:46,583 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 05:06:46,583 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 05:06:46,583 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 05:06:46,584 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 05:06:46,584 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 05:06:46,584 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 05:06:46,585 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 05:06:46,585 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 05:06:46,585 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 05:06:46,585 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 05:06:46,586 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 05:06:46,586 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 05:06:46,587 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 05:06:46,587 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 05:06:46,587 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 05:06:46,587 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 05:06:46,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 05:06:46,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 05:06:46,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:06:46,589 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 05:06:46,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 05:06:46,590 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 05:06:46,590 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 05:06:46,590 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 05:06:46,824 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 05:06:46,845 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 05:06:46,847 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 05:06:46,847 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 05:06:46,848 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 05:06:46,849 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-04-01 05:06:47,934 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 05:06:48,102 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 05:06:48,102 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-04-01 05:06:48,108 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd9350790/ca43f952f3b549028741e3a1fbf28a76/FLAG169cf6204 [2023-04-01 05:06:48,122 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd9350790/ca43f952f3b549028741e3a1fbf28a76 [2023-04-01 05:06:48,123 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 05:06:48,124 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 05:06:48,125 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 05:06:48,125 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 05:06:48,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 05:06:48,130 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,131 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e59017d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48, skipping insertion in model container [2023-04-01 05:06:48,131 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,137 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 05:06:48,150 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 05:06:48,278 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/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-04-01 05:06:48,296 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:06:48,303 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 05:06:48,313 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/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-04-01 05:06:48,322 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:06:48,333 INFO L208 MainTranslator]: Completed translation [2023-04-01 05:06:48,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48 WrapperNode [2023-04-01 05:06:48,334 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 05:06:48,334 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 05:06:48,335 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 05:06:48,335 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 05:06:48,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,347 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,347 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,350 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,353 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,353 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,354 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,356 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 05:06:48,356 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 05:06:48,356 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 05:06:48,357 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 05:06:48,357 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (1/1) ... [2023-04-01 05:06:48,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:06:48,373 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:48,388 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 05:06:48,390 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 05:06:48,420 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 05:06:48,421 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 05:06:48,421 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 05:06:48,425 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 05:06:48,425 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 05:06:48,425 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 05:06:48,425 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 05:06:48,425 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-04-01 05:06:48,425 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_float [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulong [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulonglong [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 05:06:48,426 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 05:06:48,427 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 05:06:48,428 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 05:06:48,483 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 05:06:48,485 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 05:06:48,608 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 05:06:48,658 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 05:06:48,659 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 05:06:48,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:06:48 BoogieIcfgContainer [2023-04-01 05:06:48,661 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 05:06:48,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 05:06:48,663 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 05:06:48,666 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 05:06:48,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 05:06:48" (1/3) ... [2023-04-01 05:06:48,666 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4269d093 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:06:48, skipping insertion in model container [2023-04-01 05:06:48,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:06:48" (2/3) ... [2023-04-01 05:06:48,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4269d093 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:06:48, skipping insertion in model container [2023-04-01 05:06:48,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:06:48" (3/3) ... [2023-04-01 05:06:48,668 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2023-04-01 05:06:48,682 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 05:06:48,682 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 05:06:48,721 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 05:06:48,726 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;@41d2add0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 05:06:48,726 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 05:06:48,729 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 05:06:48,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 05:06:48,735 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:48,735 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:48,736 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:48,740 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:48,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1824935055, now seen corresponding path program 1 times [2023-04-01 05:06:48,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:48,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507460881] [2023-04-01 05:06:48,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:48,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:48,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:48,958 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 05:06:48,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:48,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507460881] [2023-04-01 05:06:48,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507460881] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:06:48,959 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:06:48,959 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:06:48,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890189724] [2023-04-01 05:06:48,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:06:48,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:06:48,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:49,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:06:49,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:06:49,007 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 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 05:06:49,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:49,077 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2023-04-01 05:06:49,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:06:49,079 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 05:06:49,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:49,084 INFO L225 Difference]: With dead ends: 45 [2023-04-01 05:06:49,084 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 05:06:49,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:06:49,090 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:49,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 34 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:06:49,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 05:06:49,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 19. [2023-04-01 05:06:49,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:06:49,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-04-01 05:06:49,134 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 10 [2023-04-01 05:06:49,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:49,135 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-04-01 05:06:49,135 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 05:06:49,135 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-04-01 05:06:49,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 05:06:49,136 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:49,136 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:49,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 05:06:49,137 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:49,138 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:49,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1369059014, now seen corresponding path program 1 times [2023-04-01 05:06:49,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:49,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305727389] [2023-04-01 05:06:49,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:49,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:49,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:49,416 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 05:06:49,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:49,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305727389] [2023-04-01 05:06:49,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305727389] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:06:49,417 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:06:49,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 05:06:49,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608730943] [2023-04-01 05:06:49,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:06:49,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 05:06:49,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:49,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 05:06:49,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 05:06:49,420 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 05:06:49,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:49,510 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-04-01 05:06:49,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 05:06:49,511 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2023-04-01 05:06:49,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:49,512 INFO L225 Difference]: With dead ends: 30 [2023-04-01 05:06:49,512 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 05:06:49,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-01 05:06:49,514 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:49,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 64 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:06:49,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 05:06:49,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2023-04-01 05:06:49,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:06:49,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-04-01 05:06:49,522 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 11 [2023-04-01 05:06:49,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:49,523 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-04-01 05:06:49,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 05:06:49,523 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-04-01 05:06:49,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 05:06:49,524 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:49,524 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:49,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 05:06:49,524 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:49,525 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:49,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1360806907, now seen corresponding path program 1 times [2023-04-01 05:06:49,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:49,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147532199] [2023-04-01 05:06:49,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:49,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:49,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:49,617 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 05:06:49,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:49,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147532199] [2023-04-01 05:06:49,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147532199] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:06:49,618 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:06:49,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:06:49,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647560906] [2023-04-01 05:06:49,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:06:49,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:06:49,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:49,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:06:49,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:06:49,620 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 05:06:49,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:49,650 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-04-01 05:06:49,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:06:49,651 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2023-04-01 05:06:49,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:49,652 INFO L225 Difference]: With dead ends: 43 [2023-04-01 05:06:49,652 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 05:06:49,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:06:49,659 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:49,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 29 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:06:49,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 05:06:49,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-04-01 05:06:49,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:06:49,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-04-01 05:06:49,667 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2023-04-01 05:06:49,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:49,667 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-04-01 05:06:49,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 05:06:49,667 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-04-01 05:06:49,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 05:06:49,668 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:49,668 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:49,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 05:06:49,668 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:49,669 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:49,669 INFO L85 PathProgramCache]: Analyzing trace with hash 452630595, now seen corresponding path program 1 times [2023-04-01 05:06:49,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:49,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536931408] [2023-04-01 05:06:49,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:49,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:49,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:49,792 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:06:49,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:49,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536931408] [2023-04-01 05:06:49,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536931408] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:06:49,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003930408] [2023-04-01 05:06:49,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:49,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:49,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:49,796 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 05:06:49,797 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 05:06:49,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:49,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 05:06:49,863 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:06:49,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:06:49,910 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:06:49,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:06:49,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003930408] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:06:49,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139905333] [2023-04-01 05:06:49,995 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 05:06:49,995 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:06:49,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:06:50,003 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:06:50,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:06:50,093 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:06:50,331 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-01 05:06:50,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:06:50,343 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:06:50,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '427#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 05:06:50,676 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:06:50,676 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:06:50,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 05:06:50,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846086583] [2023-04-01 05:06:50,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:06:50,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 05:06:50,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:50,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 05:06:50,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-01 05:06:50,678 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:06:50,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:50,752 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-04-01 05:06:50,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 05:06:50,753 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-04-01 05:06:50,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:50,754 INFO L225 Difference]: With dead ends: 51 [2023-04-01 05:06:50,755 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 05:06:50,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:06:50,759 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:50,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 57 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:06:50,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 05:06:50,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-01 05:06:50,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 05:06:50,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-04-01 05:06:50,773 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 18 [2023-04-01 05:06:50,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:50,774 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-04-01 05:06:50,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:06:50,774 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-04-01 05:06:50,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 05:06:50,775 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:50,775 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:50,784 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 05:06:50,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:50,976 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:50,976 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:50,977 INFO L85 PathProgramCache]: Analyzing trace with hash 186008059, now seen corresponding path program 2 times [2023-04-01 05:06:50,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:50,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989430017] [2023-04-01 05:06:50,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:50,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:51,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:51,163 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 05:06:51,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:51,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989430017] [2023-04-01 05:06:51,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989430017] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:06:51,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91865962] [2023-04-01 05:06:51,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:06:51,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:51,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:51,166 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 05:06:51,169 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 05:06:51,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 05:06:51,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:06:51,234 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 05:06:51,236 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:06:51,388 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-01 05:06:51,389 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 05:06:51,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91865962] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:06:51,389 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 05:06:51,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-04-01 05:06:51,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995532003] [2023-04-01 05:06:51,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:06:51,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 05:06:51,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:51,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 05:06:51,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-04-01 05:06:51,392 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 05:06:51,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:51,526 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2023-04-01 05:06:51,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 05:06:51,527 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2023-04-01 05:06:51,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:51,527 INFO L225 Difference]: With dead ends: 39 [2023-04-01 05:06:51,527 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 05:06:51,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-04-01 05:06:51,528 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:51,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 71 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:06:51,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 05:06:51,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-01 05:06:51,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 05:06:51,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-04-01 05:06:51,535 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2023-04-01 05:06:51,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:51,536 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-04-01 05:06:51,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 05:06:51,536 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-04-01 05:06:51,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 05:06:51,540 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:51,541 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:51,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 05:06:51,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:51,741 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:51,742 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:51,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1470815926, now seen corresponding path program 1 times [2023-04-01 05:06:51,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:51,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122844759] [2023-04-01 05:06:51,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:51,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:51,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:51,926 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-01 05:06:51,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:51,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122844759] [2023-04-01 05:06:51,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122844759] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:06:51,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267709037] [2023-04-01 05:06:51,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:51,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:51,927 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:51,928 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 05:06:51,954 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 05:06:51,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:51,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 05:06:51,993 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:06:52,058 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-01 05:06:52,058 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:06:52,180 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-01 05:06:52,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267709037] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:06:52,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823278288] [2023-04-01 05:06:52,183 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 05:06:52,183 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:06:52,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:06:52,183 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:06:52,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:06:52,216 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:06:52,589 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-01 05:06:52,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:06:52,596 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:06:52,981 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1101#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 05:06:52,982 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:06:52,982 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:06:52,982 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2023-04-01 05:06:52,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783063219] [2023-04-01 05:06:52,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:06:52,983 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 05:06:52,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:52,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 05:06:52,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2023-04-01 05:06:52,984 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-01 05:06:53,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:53,508 INFO L93 Difference]: Finished difference Result 132 states and 173 transitions. [2023-04-01 05:06:53,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-01 05:06:53,509 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2023-04-01 05:06:53,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:53,510 INFO L225 Difference]: With dead ends: 132 [2023-04-01 05:06:53,510 INFO L226 Difference]: Without dead ends: 103 [2023-04-01 05:06:53,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=332, Invalid=1738, Unknown=0, NotChecked=0, Total=2070 [2023-04-01 05:06:53,512 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:53,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 120 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 05:06:53,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-04-01 05:06:53,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 95. [2023-04-01 05:06:53,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 27 states have call successors, (27), 5 states have call predecessors, (27), 3 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-01 05:06:53,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2023-04-01 05:06:53,535 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 46 [2023-04-01 05:06:53,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:53,535 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2023-04-01 05:06:53,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-01 05:06:53,535 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2023-04-01 05:06:53,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-04-01 05:06:53,538 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:53,538 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:53,549 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 05:06:53,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:53,747 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:53,748 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:53,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1659286991, now seen corresponding path program 2 times [2023-04-01 05:06:53,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:53,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723599885] [2023-04-01 05:06:53,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:53,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:53,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:54,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2023-04-01 05:06:54,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:54,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723599885] [2023-04-01 05:06:54,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723599885] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:06:54,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391322239] [2023-04-01 05:06:54,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:06:54,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:54,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:54,135 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 05:06:54,157 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 05:06:54,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-04-01 05:06:54,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:06:54,716 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 05:06:54,719 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:06:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2023-04-01 05:06:54,787 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:06:55,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2023-04-01 05:06:55,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391322239] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:06:55,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191874692] [2023-04-01 05:06:55,039 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 05:06:55,039 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:06:55,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:06:55,040 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:06:55,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:06:55,063 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:06:55,482 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-01 05:06:55,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:06:55,488 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:06:56,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2625#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 05:06:56,312 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:06:56,312 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:06:56,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2023-04-01 05:06:56,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820021824] [2023-04-01 05:06:56,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:06:56,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 05:06:56,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:06:56,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 05:06:56,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2023-04-01 05:06:56,315 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-01 05:06:57,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:06:57,050 INFO L93 Difference]: Finished difference Result 252 states and 354 transitions. [2023-04-01 05:06:57,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 05:06:57,050 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) Word has length 182 [2023-04-01 05:06:57,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:06:57,055 INFO L225 Difference]: With dead ends: 252 [2023-04-01 05:06:57,056 INFO L226 Difference]: Without dead ends: 179 [2023-04-01 05:06:57,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 510 SyntacticMatches, 21 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2023-04-01 05:06:57,059 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 05:06:57,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 134 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 05:06:57,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-04-01 05:06:57,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2023-04-01 05:06:57,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 55 states have call successors, (55), 5 states have call predecessors, (55), 3 states have return successors, (53), 53 states have call predecessors, (53), 53 states have call successors, (53) [2023-04-01 05:06:57,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 233 transitions. [2023-04-01 05:06:57,124 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 233 transitions. Word has length 182 [2023-04-01 05:06:57,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:06:57,124 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 233 transitions. [2023-04-01 05:06:57,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-01 05:06:57,124 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 233 transitions. [2023-04-01 05:06:57,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2023-04-01 05:06:57,129 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:06:57,129 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:06:57,153 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 05:06:57,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:57,330 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:06:57,330 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:06:57,330 INFO L85 PathProgramCache]: Analyzing trace with hash 471985621, now seen corresponding path program 3 times [2023-04-01 05:06:57,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:06:57,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413602751] [2023-04-01 05:06:57,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:06:57,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:06:57,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:06:58,317 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2023-04-01 05:06:58,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:06:58,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413602751] [2023-04-01 05:06:58,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413602751] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:06:58,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581422334] [2023-04-01 05:06:58,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:06:58,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:06:58,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:06:58,319 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 05:06:58,322 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 05:06:58,501 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:06:58,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:06:58,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-01 05:06:58,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:06:58,947 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-04-01 05:06:58,947 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:06:59,632 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-04-01 05:06:59,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581422334] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:06:59,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953484132] [2023-04-01 05:06:59,634 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 05:06:59,635 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:06:59,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:06:59,635 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:06:59,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:06:59,648 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:06:59,865 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-01 05:06:59,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:06:59,870 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:07:00,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5658#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 05:07:00,401 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:07:00,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:07:00,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2023-04-01 05:07:00,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624469975] [2023-04-01 05:07:00,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:07:00,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-01 05:07:00,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:07:00,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-01 05:07:00,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2023-04-01 05:07:00,405 INFO L87 Difference]: Start difference. First operand 179 states and 233 transitions. Second operand has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-04-01 05:07:08,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:07:08,760 INFO L93 Difference]: Finished difference Result 605 states and 820 transitions. [2023-04-01 05:07:08,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2023-04-01 05:07:08,760 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) Word has length 378 [2023-04-01 05:07:08,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:07:08,764 INFO L225 Difference]: With dead ends: 605 [2023-04-01 05:07:08,764 INFO L226 Difference]: Without dead ends: 469 [2023-04-01 05:07:08,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1282 GetRequests, 1105 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11197 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=3455, Invalid=28407, Unknown=0, NotChecked=0, Total=31862 [2023-04-01 05:07:08,792 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 227 mSDsluCounter, 859 mSDsCounter, 0 mSdLazyCounter, 3658 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 999 SdHoareTripleChecker+Invalid, 3785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 3658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-01 05:07:08,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 999 Invalid, 3785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 3658 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-01 05:07:08,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2023-04-01 05:07:08,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 449. [2023-04-01 05:07:08,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 302 states have (on average 1.0364238410596027) internal successors, (313), 302 states have internal predecessors, (313), 143 states have call successors, (143), 5 states have call predecessors, (143), 3 states have return successors, (141), 141 states have call predecessors, (141), 141 states have call successors, (141) [2023-04-01 05:07:08,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 597 transitions. [2023-04-01 05:07:08,872 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 597 transitions. Word has length 378 [2023-04-01 05:07:08,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:07:08,874 INFO L495 AbstractCegarLoop]: Abstraction has 449 states and 597 transitions. [2023-04-01 05:07:08,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-04-01 05:07:08,875 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 597 transitions. [2023-04-01 05:07:08,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2023-04-01 05:07:08,908 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:07:08,908 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:07:08,919 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 05:07:09,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:07:09,117 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:07:09,117 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:07:09,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1738781521, now seen corresponding path program 4 times [2023-04-01 05:07:09,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:07:09,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624580408] [2023-04-01 05:07:09,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:07:09,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:07:09,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:07:12,047 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2023-04-01 05:07:12,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:07:12,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624580408] [2023-04-01 05:07:12,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624580408] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:07:12,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821854867] [2023-04-01 05:07:12,048 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:07:12,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:07:12,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:07:12,053 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 05:07:12,072 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 05:07:12,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:07:12,502 INFO L262 TraceCheckSpWp]: Trace formula consists of 2156 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-01 05:07:12,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:07:13,517 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-04-01 05:07:13,517 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:07:15,426 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-04-01 05:07:15,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821854867] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:07:15,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419405497] [2023-04-01 05:07:15,429 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 05:07:15,429 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:07:15,429 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:07:15,429 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:07:15,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:07:15,443 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:07:15,777 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-01 05:07:15,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:07:15,782 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:07:23,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13741#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 05:07:23,218 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:07:23,219 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:07:23,219 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2023-04-01 05:07:23,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660658775] [2023-04-01 05:07:23,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:07:23,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-04-01 05:07:23,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:07:23,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-04-01 05:07:23,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=690, Invalid=4140, Unknown=0, NotChecked=0, Total=4830 [2023-04-01 05:07:23,224 INFO L87 Difference]: Start difference. First operand 449 states and 597 transitions. Second operand has 60 states, 60 states have (on average 3.1333333333333333) internal successors, (188), 60 states have internal predecessors, (188), 55 states have call successors, (78), 2 states have call predecessors, (78), 1 states have return successors, (76), 55 states have call predecessors, (76), 55 states have call successors, (76)