/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 IntervalDomain -i ../sv-benchmarks/c/loops/n.c24.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:58:15,674 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:58:15,675 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:58:15,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:58:15,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:58:15,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:58:15,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:58:15,702 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:58:15,704 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:58:15,704 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:58:15,705 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:58:15,706 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:58:15,706 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:58:15,707 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:58:15,708 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:58:15,709 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:58:15,709 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:58:15,710 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:58:15,711 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:58:15,713 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:58:15,714 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:58:15,715 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:58:15,716 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:58:15,716 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:58:15,719 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 22:58:15,719 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 22:58:15,719 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 22:58:15,720 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 22:58:15,720 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 22:58:15,721 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 22:58:15,721 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:58:15,722 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:58:15,723 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:58:15,723 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:58:15,724 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:58:15,724 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:58:15,725 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:58:15,725 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:58:15,725 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:58:15,726 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:58:15,726 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:58:15,727 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 [2023-03-31 22:58:15,746 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:58:15,746 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:58:15,746 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:58:15,746 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:58:15,747 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:58:15,747 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:58:15,747 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:58:15,748 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:58:15,748 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:58:15,749 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:58:15,749 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:58:15,749 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:58:15,749 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:58:15,750 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:58:15,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:58:15,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:58:15,751 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:58:15,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:58:15,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:58:15,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:58:15,753 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:58:15,753 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:58:15,943 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:58:15,960 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:58:15,962 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:58:15,963 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:58:15,963 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:58:15,964 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/n.c24.i [2023-03-31 22:58:17,201 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:58:17,382 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:58:17,382 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/n.c24.i [2023-03-31 22:58:17,395 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67a6cdd21/5482d1bb2d384431ae8333c72e3d1ae7/FLAG30c1b521e [2023-03-31 22:58:17,406 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67a6cdd21/5482d1bb2d384431ae8333c72e3d1ae7 [2023-03-31 22:58:17,408 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:58:17,409 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:58:17,410 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:58:17,411 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:58:17,416 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:58:17,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,418 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e29322a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17, skipping insertion in model container [2023-03-31 22:58:17,418 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,425 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:58:17,457 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:58:17,574 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/n.c24.i[805,818] [2023-03-31 22:58:17,619 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:58:17,639 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:58:17,652 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/n.c24.i[805,818] [2023-03-31 22:58:17,670 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:58:17,689 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:58:17,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17 WrapperNode [2023-03-31 22:58:17,690 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:58:17,691 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:58:17,691 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:58:17,691 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:58:17,698 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,705 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,705 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,717 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,721 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,723 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,724 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,728 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:58:17,729 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:58:17,729 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:58:17,729 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:58:17,730 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (1/1) ... [2023-03-31 22:58:17,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:58:17,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:17,758 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) [2023-03-31 22:58:17,760 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 [2023-03-31 22:58:17,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:58:17,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:58:17,791 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:58:17,792 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 22:58:17,792 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2023-03-31 22:58:17,792 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2023-03-31 22:58:17,792 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:58:17,792 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2023-03-31 22:58:17,792 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:58:17,792 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure memmove [2023-03-31 22:58:17,793 INFO L130 BoogieDeclarations]: Found specification of procedure memccpy [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure memcmp [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure memchr [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure strcpy [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure strcat [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure strncat [2023-03-31 22:58:17,794 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strncmp [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll_l [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm_l [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strdup [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strndup [2023-03-31 22:58:17,795 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strrchr [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strcspn [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strspn [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strpbrk [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strstr [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strtok [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure __strtok_r [2023-03-31 22:58:17,796 INFO L130 BoogieDeclarations]: Found specification of procedure strtok_r [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure strnlen [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure strerror [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_r [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_l [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure __bzero [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure bcopy [2023-03-31 22:58:17,797 INFO L130 BoogieDeclarations]: Found specification of procedure bzero [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure bcmp [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure index [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure rindex [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure ffs [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure strsep [2023-03-31 22:58:17,798 INFO L130 BoogieDeclarations]: Found specification of procedure strsignal [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure __stpcpy [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure stpcpy [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure __stpncpy [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure stpncpy [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2023-03-31 22:58:17,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:58:17,800 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2023-03-31 22:58:17,801 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2023-03-31 22:58:18,013 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:58:18,015 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:58:18,243 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:58:18,322 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:58:18,322 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-03-31 22:58:18,324 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:58:18 BoogieIcfgContainer [2023-03-31 22:58:18,325 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:58:18,327 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:58:18,327 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:58:18,330 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:58:18,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:58:17" (1/3) ... [2023-03-31 22:58:18,330 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@396f81c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:58:18, skipping insertion in model container [2023-03-31 22:58:18,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:58:17" (2/3) ... [2023-03-31 22:58:18,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@396f81c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:58:18, skipping insertion in model container [2023-03-31 22:58:18,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:58:18" (3/3) ... [2023-03-31 22:58:18,332 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24.i [2023-03-31 22:58:18,355 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:58:18,355 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:58:18,398 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:58:18,404 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;@4dee7e48, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:58:18,404 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:58:18,409 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 30 states have internal predecessors, (43), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 22:58:18,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 22:58:18,415 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:18,415 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:18,417 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:18,423 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:18,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1187962552, now seen corresponding path program 1 times [2023-03-31 22:58:18,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:18,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472113367] [2023-03-31 22:58:18,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:18,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:18,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:18,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:58:18,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:18,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472113367] [2023-03-31 22:58:18,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472113367] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:58:18,632 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:58:18,632 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:58:18,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918914649] [2023-03-31 22:58:18,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:58:18,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:58:18,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:18,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:58:18,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:58:18,671 INFO L87 Difference]: Start difference. First operand has 43 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 30 states have internal predecessors, (43), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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) [2023-03-31 22:58:18,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:18,723 INFO L93 Difference]: Finished difference Result 100 states and 137 transitions. [2023-03-31 22:58:18,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:58:18,725 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 [2023-03-31 22:58:18,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:18,731 INFO L225 Difference]: With dead ends: 100 [2023-03-31 22:58:18,731 INFO L226 Difference]: Without dead ends: 54 [2023-03-31 22:58:18,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:58:18,737 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 21 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:18,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 82 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 22:58:18,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-03-31 22:58:18,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2023-03-31 22:58:18,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:18,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2023-03-31 22:58:18,771 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 11 [2023-03-31 22:58:18,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:18,771 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2023-03-31 22:58:18,772 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) [2023-03-31 22:58:18,772 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2023-03-31 22:58:18,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-03-31 22:58:18,772 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:18,772 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:18,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:58:18,773 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:18,774 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:18,774 INFO L85 PathProgramCache]: Analyzing trace with hash 244992304, now seen corresponding path program 1 times [2023-03-31 22:58:18,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:18,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999577352] [2023-03-31 22:58:18,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:18,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:18,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:18,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:58:18,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:18,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999577352] [2023-03-31 22:58:18,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999577352] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:18,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614275840] [2023-03-31 22:58:18,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:18,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:18,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:18,916 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) [2023-03-31 22:58:18,933 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 22:58:19,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:19,039 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 22:58:19,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:58:19,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:19,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:58:19,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614275840] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:19,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1810635349] [2023-03-31 22:58:19,157 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-03-31 22:58:19,157 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:19,160 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:19,164 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:19,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:19,285 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:19,506 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-03-31 22:58:19,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:19,521 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:19,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1810635349] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:58:19,851 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:19,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 4, 4] total 19 [2023-03-31 22:58:19,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466287289] [2023-03-31 22:58:19,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:58:19,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 22:58:19,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:19,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 22:58:19,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2023-03-31 22:58:19,857 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 14 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:20,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:20,893 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2023-03-31 22:58:20,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-03-31 22:58:20,893 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-03-31 22:58:20,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:20,896 INFO L225 Difference]: With dead ends: 50 [2023-03-31 22:58:20,896 INFO L226 Difference]: Without dead ends: 45 [2023-03-31 22:58:20,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 22:58:20,903 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 100 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:20,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 7 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 22:58:20,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-03-31 22:58:20,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2023-03-31 22:58:20,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:20,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2023-03-31 22:58:20,924 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 16 [2023-03-31 22:58:20,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:20,924 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2023-03-31 22:58:20,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:20,925 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2023-03-31 22:58:20,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-03-31 22:58:20,925 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:20,926 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:20,935 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 22:58:21,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:21,133 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:21,133 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:21,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1313195313, now seen corresponding path program 1 times [2023-03-31 22:58:21,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:21,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97280691] [2023-03-31 22:58:21,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:21,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:21,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:21,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 22:58:21,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:21,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97280691] [2023-03-31 22:58:21,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97280691] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:21,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417890743] [2023-03-31 22:58:21,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:21,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:21,264 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:21,265 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) [2023-03-31 22:58:21,267 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 22:58:21,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:21,360 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 22:58:21,361 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:21,372 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 22:58:21,373 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 22:58:21,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417890743] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:21,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233373437] [2023-03-31 22:58:21,403 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:21,404 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:21,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:21,404 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:21,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:21,452 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:22,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:22,045 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:22,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:22,058 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:22,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '676#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:22,852 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:22,852 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:22,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 22:58:22,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325357233] [2023-03-31 22:58:22,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:22,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 22:58:22,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:22,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 22:58:22,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2023-03-31 22:58:22,854 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:22,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:22,950 INFO L93 Difference]: Finished difference Result 132 states and 177 transitions. [2023-03-31 22:58:22,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 22:58:22,951 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-03-31 22:58:22,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:22,954 INFO L225 Difference]: With dead ends: 132 [2023-03-31 22:58:22,954 INFO L226 Difference]: Without dead ends: 100 [2023-03-31 22:58:22,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2023-03-31 22:58:22,957 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 134 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:22,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 88 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:58:22,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-03-31 22:58:22,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2023-03-31 22:58:22,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 73 states have internal predecessors, (94), 15 states have call successors, (15), 6 states have call predecessors, (15), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-03-31 22:58:22,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 122 transitions. [2023-03-31 22:58:22,996 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 122 transitions. Word has length 24 [2023-03-31 22:58:22,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:22,996 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 122 transitions. [2023-03-31 22:58:22,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:22,996 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 122 transitions. [2023-03-31 22:58:22,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 22:58:22,998 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:22,998 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:23,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 22:58:23,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-03-31 22:58:23,205 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:23,206 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:23,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1932930045, now seen corresponding path program 2 times [2023-03-31 22:58:23,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:23,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290650063] [2023-03-31 22:58:23,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:23,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:23,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:23,377 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-03-31 22:58:23,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:23,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290650063] [2023-03-31 22:58:23,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290650063] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:23,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297271889] [2023-03-31 22:58:23,379 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:58:23,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:23,380 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:23,381 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) [2023-03-31 22:58:23,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 22:58:23,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 22:58:23,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:58:23,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 22:58:23,481 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:23,494 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-03-31 22:58:23,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:23,541 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-03-31 22:58:23,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297271889] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:23,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [358330477] [2023-03-31 22:58:23,543 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:23,543 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:23,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:23,544 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:23,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:23,566 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:23,965 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:23,970 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:23,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:23,979 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:24,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1280#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:24,695 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:24,696 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:24,696 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-03-31 22:58:24,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070172677] [2023-03-31 22:58:24,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:24,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 22:58:24,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:24,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 22:58:24,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 22:58:24,698 INFO L87 Difference]: Start difference. First operand 93 states and 122 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:24,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:24,886 INFO L93 Difference]: Finished difference Result 297 states and 414 transitions. [2023-03-31 22:58:24,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 22:58:24,887 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2023-03-31 22:58:24,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:24,890 INFO L225 Difference]: With dead ends: 297 [2023-03-31 22:58:24,890 INFO L226 Difference]: Without dead ends: 214 [2023-03-31 22:58:24,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 22:58:24,893 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 264 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:24,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 268 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:58:24,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2023-03-31 22:58:24,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 201. [2023-03-31 22:58:24,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 163 states have (on average 1.2760736196319018) internal successors, (208), 163 states have internal predecessors, (208), 33 states have call successors, (33), 6 states have call predecessors, (33), 4 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-03-31 22:58:24,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 272 transitions. [2023-03-31 22:58:24,954 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 272 transitions. Word has length 39 [2023-03-31 22:58:24,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:24,954 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 272 transitions. [2023-03-31 22:58:24,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:24,955 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 272 transitions. [2023-03-31 22:58:24,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-03-31 22:58:24,963 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:24,963 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:24,975 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 22:58:25,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:25,170 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:25,170 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:25,170 INFO L85 PathProgramCache]: Analyzing trace with hash -367717243, now seen corresponding path program 3 times [2023-03-31 22:58:25,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:25,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927925613] [2023-03-31 22:58:25,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:25,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:25,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:25,427 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2023-03-31 22:58:25,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:25,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927925613] [2023-03-31 22:58:25,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927925613] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:25,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709413053] [2023-03-31 22:58:25,427 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 22:58:25,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:25,428 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:25,429 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) [2023-03-31 22:58:25,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 22:58:25,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 22:58:25,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:58:25,562 INFO L262 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 22:58:25,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:25,621 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-03-31 22:58:25,622 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:25,864 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-03-31 22:58:25,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709413053] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:25,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422695735] [2023-03-31 22:58:25,867 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:25,867 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:25,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:25,870 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:25,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:25,889 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:26,261 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:26,265 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:26,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:26,272 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:26,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2472#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:26,965 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:26,965 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:26,965 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-03-31 22:58:26,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791776531] [2023-03-31 22:58:26,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:26,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-03-31 22:58:26,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:26,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-03-31 22:58:26,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=1587, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 22:58:26,968 INFO L87 Difference]: Start difference. First operand 201 states and 272 transitions. Second operand has 25 states, 25 states have (on average 4.92) internal successors, (123), 25 states have internal predecessors, (123), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:27,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:27,300 INFO L93 Difference]: Finished difference Result 627 states and 888 transitions. [2023-03-31 22:58:27,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-03-31 22:58:27,301 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.92) internal successors, (123), 25 states have internal predecessors, (123), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 69 [2023-03-31 22:58:27,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:27,303 INFO L225 Difference]: With dead ends: 627 [2023-03-31 22:58:27,303 INFO L226 Difference]: Without dead ends: 442 [2023-03-31 22:58:27,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=393, Invalid=1587, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 22:58:27,306 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 537 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 601 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:27,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [601 Valid, 427 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 22:58:27,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2023-03-31 22:58:27,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 417. [2023-03-31 22:58:27,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 343 states have (on average 1.271137026239067) internal successors, (436), 343 states have internal predecessors, (436), 69 states have call successors, (69), 6 states have call predecessors, (69), 4 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) [2023-03-31 22:58:27,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 572 transitions. [2023-03-31 22:58:27,355 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 572 transitions. Word has length 69 [2023-03-31 22:58:27,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:27,355 INFO L495 AbstractCegarLoop]: Abstraction has 417 states and 572 transitions. [2023-03-31 22:58:27,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 4.92) internal successors, (123), 25 states have internal predecessors, (123), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:27,356 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 572 transitions. [2023-03-31 22:58:27,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-03-31 22:58:27,358 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:27,358 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:27,366 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 22:58:27,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:27,564 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:27,565 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:27,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1701055369, now seen corresponding path program 4 times [2023-03-31 22:58:27,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:27,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529403836] [2023-03-31 22:58:27,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:27,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:27,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:28,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2023-03-31 22:58:28,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:28,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529403836] [2023-03-31 22:58:28,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529403836] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:28,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198511753] [2023-03-31 22:58:28,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 22:58:28,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:28,458 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:28,460 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) [2023-03-31 22:58:28,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 22:58:28,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:28,643 INFO L262 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 24 conjunts are in the unsatisfiable core [2023-03-31 22:58:28,655 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:28,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2023-03-31 22:58:28,700 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:29,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 968 trivial. 0 not checked. [2023-03-31 22:58:29,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198511753] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:29,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891827723] [2023-03-31 22:58:29,318 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:29,319 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:29,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:29,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:29,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:29,338 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:29,723 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:29,727 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:29,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:29,735 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:30,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4840#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:30,464 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:30,464 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:30,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-03-31 22:58:30,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874835118] [2023-03-31 22:58:30,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:30,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-03-31 22:58:30,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:30,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-03-31 22:58:30,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1269, Invalid=3423, Unknown=0, NotChecked=0, Total=4692 [2023-03-31 22:58:30,467 INFO L87 Difference]: Start difference. First operand 417 states and 572 transitions. Second operand has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 49 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:31,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:31,491 INFO L93 Difference]: Finished difference Result 1287 states and 1836 transitions. [2023-03-31 22:58:31,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-03-31 22:58:31,492 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 49 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 129 [2023-03-31 22:58:31,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:31,497 INFO L225 Difference]: With dead ends: 1287 [2023-03-31 22:58:31,497 INFO L226 Difference]: Without dead ends: 898 [2023-03-31 22:58:31,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1269, Invalid=3423, Unknown=0, NotChecked=0, Total=4692 [2023-03-31 22:58:31,500 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 1623 mSDsluCounter, 931 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1761 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:31,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1761 Valid, 963 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 22:58:31,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2023-03-31 22:58:31,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 849. [2023-03-31 22:58:31,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 703 states have (on average 1.2688477951635846) internal successors, (892), 703 states have internal predecessors, (892), 141 states have call successors, (141), 6 states have call predecessors, (141), 4 states have return successors, (139), 139 states have call predecessors, (139), 139 states have call successors, (139) [2023-03-31 22:58:31,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1172 transitions. [2023-03-31 22:58:31,594 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1172 transitions. Word has length 129 [2023-03-31 22:58:31,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:31,595 INFO L495 AbstractCegarLoop]: Abstraction has 849 states and 1172 transitions. [2023-03-31 22:58:31,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 49 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 22:58:31,595 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1172 transitions. [2023-03-31 22:58:31,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2023-03-31 22:58:31,599 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:31,599 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:31,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 22:58:31,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:31,810 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:31,810 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:31,810 INFO L85 PathProgramCache]: Analyzing trace with hash 2097402257, now seen corresponding path program 5 times [2023-03-31 22:58:31,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:31,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566653305] [2023-03-31 22:58:31,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:31,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:31,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:34,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5313 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 4232 trivial. 0 not checked. [2023-03-31 22:58:34,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:34,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566653305] [2023-03-31 22:58:34,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566653305] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:34,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674842028] [2023-03-31 22:58:34,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:58:34,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:34,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:34,553 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) [2023-03-31 22:58:34,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 22:58:34,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 22:58:34,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:58:34,725 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 22:58:34,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:34,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5313 backedges. 136 proven. 1 refuted. 0 times theorem prover too weak. 5176 trivial. 0 not checked. [2023-03-31 22:58:34,881 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:35,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5313 backedges. 136 proven. 1 refuted. 0 times theorem prover too weak. 5176 trivial. 0 not checked. [2023-03-31 22:58:35,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674842028] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:35,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205588951] [2023-03-31 22:58:35,103 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:35,103 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:35,103 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:35,103 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:35,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:35,122 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:35,449 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:35,452 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:35,455 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:35,460 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:36,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9522#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:36,678 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:36,678 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:36,678 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 7, 7] total 59 [2023-03-31 22:58:36,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586533794] [2023-03-31 22:58:36,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:36,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-03-31 22:58:36,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:36,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-03-31 22:58:36,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1301, Invalid=4861, Unknown=0, NotChecked=0, Total=6162 [2023-03-31 22:58:36,684 INFO L87 Difference]: Start difference. First operand 849 states and 1172 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 6 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:53,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:53,348 INFO L93 Difference]: Finished difference Result 4218 states and 5940 transitions. [2023-03-31 22:58:53,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 337 states. [2023-03-31 22:58:53,349 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 6 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 249 [2023-03-31 22:58:53,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:53,364 INFO L225 Difference]: With dead ends: 4218 [2023-03-31 22:58:53,365 INFO L226 Difference]: Without dead ends: 3416 [2023-03-31 22:58:53,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1221 GetRequests, 860 SyntacticMatches, 0 SemanticMatches, 361 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53385 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=31821, Invalid=99585, Unknown=0, NotChecked=0, Total=131406 [2023-03-31 22:58:53,382 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 6152 mSDsluCounter, 1100 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 1518 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6155 SdHoareTripleChecker+Valid, 1131 SdHoareTripleChecker+Invalid, 2378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1518 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:53,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6155 Valid, 1131 Invalid, 2378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1518 Valid, 860 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-03-31 22:58:53,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3416 states. [2023-03-31 22:58:53,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3416 to 909. [2023-03-31 22:58:53,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 909 states, 751 states have (on average 1.2729693741677763) internal successors, (956), 751 states have internal predecessors, (956), 153 states have call successors, (153), 6 states have call predecessors, (153), 4 states have return successors, (151), 151 states have call predecessors, (151), 151 states have call successors, (151) [2023-03-31 22:58:53,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 909 states to 909 states and 1260 transitions. [2023-03-31 22:58:53,545 INFO L78 Accepts]: Start accepts. Automaton has 909 states and 1260 transitions. Word has length 249 [2023-03-31 22:58:53,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:53,546 INFO L495 AbstractCegarLoop]: Abstraction has 909 states and 1260 transitions. [2023-03-31 22:58:53,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 6 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:53,546 INFO L276 IsEmpty]: Start isEmpty. Operand 909 states and 1260 transitions. [2023-03-31 22:58:53,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2023-03-31 22:58:53,552 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:53,552 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 47, 47, 47, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:53,558 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-03-31 22:58:53,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:53,761 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:53,761 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:53,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1015205414, now seen corresponding path program 6 times [2023-03-31 22:58:53,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:53,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668296439] [2023-03-31 22:58:53,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:53,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:53,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:56,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 4607 trivial. 0 not checked. [2023-03-31 22:58:56,345 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:56,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668296439] [2023-03-31 22:58:56,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668296439] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:56,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565583848] [2023-03-31 22:58:56,345 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 22:58:56,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:56,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:56,346 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 22:58:56,348 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 22:58:56,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 22:58:56,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:58:56,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 49 conjunts are in the unsatisfiable core [2023-03-31 22:58:56,642 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:56,887 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 4555 refuted. 0 times theorem prover too weak. 1180 trivial. 0 not checked. [2023-03-31 22:58:56,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:59,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 4555 refuted. 0 times theorem prover too weak. 1180 trivial. 0 not checked. [2023-03-31 22:58:59,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565583848] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:59,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205232457] [2023-03-31 22:58:59,289 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 22:58:59,289 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:59,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:59,290 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:59,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:59,310 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:59,708 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:59,711 INFO L197 IcfgInterpreter]: Interpreting procedure foo with input of size 15 for LOIs [2023-03-31 22:58:59,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:59,716 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:59:00,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19381#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:59:00,632 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:59:00,633 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:59:00,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2023-03-31 22:59:00,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454634440] [2023-03-31 22:59:00,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:59:00,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2023-03-31 22:59:00,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:59:00,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2023-03-31 22:59:00,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4944, Invalid=9098, Unknown=0, NotChecked=0, Total=14042 [2023-03-31 22:59:00,638 INFO L87 Difference]: Start difference. First operand 909 states and 1260 transitions. Second operand has 99 states, 99 states have (on average 4.606060606060606) internal successors, (456), 99 states have internal predecessors, (456), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:59:05,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:59:05,672 INFO L93 Difference]: Finished difference Result 4804 states and 7024 transitions. [2023-03-31 22:59:05,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2023-03-31 22:59:05,672 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 4.606060606060606) internal successors, (456), 99 states have internal predecessors, (456), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 278 [2023-03-31 22:59:05,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:59:05,692 INFO L225 Difference]: With dead ends: 4804 [2023-03-31 22:59:05,692 INFO L226 Difference]: Without dead ends: 3948 [2023-03-31 22:59:05,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 766 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3142 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4944, Invalid=9098, Unknown=0, NotChecked=0, Total=14042 [2023-03-31 22:59:05,699 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 2212 mSDsluCounter, 2202 mSDsCounter, 0 mSdLazyCounter, 1124 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2498 SdHoareTripleChecker+Valid, 2234 SdHoareTripleChecker+Invalid, 1518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 1124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 22:59:05,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2498 Valid, 2234 Invalid, 1518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 1124 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-03-31 22:59:05,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3948 states. [2023-03-31 22:59:06,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3948 to 1791. [2023-03-31 22:59:06,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1791 states, 1486 states have (on average 1.2698519515477793) internal successors, (1887), 1486 states have internal predecessors, (1887), 300 states have call successors, (300), 6 states have call predecessors, (300), 4 states have return successors, (298), 298 states have call predecessors, (298), 298 states have call successors, (298) [2023-03-31 22:59:06,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1791 states to 1791 states and 2485 transitions. [2023-03-31 22:59:06,039 INFO L78 Accepts]: Start accepts. Automaton has 1791 states and 2485 transitions. Word has length 278 [2023-03-31 22:59:06,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:59:06,039 INFO L495 AbstractCegarLoop]: Abstraction has 1791 states and 2485 transitions. [2023-03-31 22:59:06,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 4.606060606060606) internal successors, (456), 99 states have internal predecessors, (456), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:59:06,040 INFO L276 IsEmpty]: Start isEmpty. Operand 1791 states and 2485 transitions. [2023-03-31 22:59:06,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2023-03-31 22:59:06,052 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:59:06,052 INFO L195 NwaCegarLoop]: trace histogram [96, 96, 96, 96, 96, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:59:06,061 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 22:59:06,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:59:06,261 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:59:06,262 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:59:06,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1345422164, now seen corresponding path program 7 times [2023-03-31 22:59:06,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:59:06,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626757202] [2023-03-31 22:59:06,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:59:06,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:59:06,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat