/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-programs/copysome1-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 02:48:46,042 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 02:48:46,043 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 02:48:46,089 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 02:48:46,089 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 02:48:46,092 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 02:48:46,094 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 02:48:46,097 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 02:48:46,099 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 02:48:46,103 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 02:48:46,105 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 02:48:46,106 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 02:48:46,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 02:48:46,108 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 02:48:46,109 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 02:48:46,110 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 02:48:46,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 02:48:46,111 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 02:48:46,113 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 02:48:46,117 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 02:48:46,118 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 02:48:46,119 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 02:48:46,119 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 02:48:46,120 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 02:48:46,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 02:48:46,128 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 02:48:46,128 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 02:48:46,130 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 02:48:46,130 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 02:48:46,131 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 02:48:46,131 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 02:48:46,132 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 02:48:46,133 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 02:48:46,134 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 02:48:46,134 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 02:48:46,134 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 02:48:46,135 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 02:48:46,135 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 02:48:46,135 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 02:48:46,136 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 02:48:46,136 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 02:48:46,138 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 02:48:46,165 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 02:48:46,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 02:48:46,166 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 02:48:46,166 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 02:48:46,167 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 02:48:46,167 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 02:48:46,167 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 02:48:46,167 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 02:48:46,167 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 02:48:46,167 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 02:48:46,168 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 02:48:46,168 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 02:48:46,168 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 02:48:46,168 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 02:48:46,168 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 02:48:46,169 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 02:48:46,169 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 02:48:46,169 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 02:48:46,169 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 02:48:46,169 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 02:48:46,169 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 02:48:46,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 02:48:46,170 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 02:48:46,170 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:48:46,171 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 02:48:46,171 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 02:48:46,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 02:48:46,403 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 02:48:46,405 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 02:48:46,406 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 02:48:46,406 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 02:48:46,407 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-programs/copysome1-2.i [2023-04-01 02:48:47,441 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 02:48:47,661 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 02:48:47,661 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-programs/copysome1-2.i [2023-04-01 02:48:47,666 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a45b34cd8/e25e2c08ddb34ddaa35560c9e9f19237/FLAG7c32ab12e [2023-04-01 02:48:47,680 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a45b34cd8/e25e2c08ddb34ddaa35560c9e9f19237 [2023-04-01 02:48:47,682 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 02:48:47,683 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 02:48:47,686 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 02:48:47,686 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 02:48:47,689 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 02:48:47,689 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,691 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f5773e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47, skipping insertion in model container [2023-04-01 02:48:47,691 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,696 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 02:48:47,714 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 02:48:47,844 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/array-programs/copysome1-2.i[805,818] [2023-04-01 02:48:47,857 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:48:47,867 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 02:48:47,876 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/array-programs/copysome1-2.i[805,818] [2023-04-01 02:48:47,887 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:48:47,899 INFO L208 MainTranslator]: Completed translation [2023-04-01 02:48:47,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47 WrapperNode [2023-04-01 02:48:47,900 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 02:48:47,901 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 02:48:47,901 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 02:48:47,901 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 02:48:47,909 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,909 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,916 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,917 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,931 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,935 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,939 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,940 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,944 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 02:48:47,945 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 02:48:47,945 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 02:48:47,945 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 02:48:47,947 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (1/1) ... [2023-04-01 02:48:47,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:48:47,960 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:48,002 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 02:48:48,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 02:48:48,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 02:48:48,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 02:48:48,074 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 02:48:48,074 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 02:48:48,074 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 02:48:48,074 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 02:48:48,074 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 02:48:48,074 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 02:48:48,074 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 02:48:48,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 02:48:48,124 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 02:48:48,125 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 02:48:48,295 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 02:48:48,322 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 02:48:48,323 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 02:48:48,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:48:48 BoogieIcfgContainer [2023-04-01 02:48:48,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 02:48:48,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 02:48:48,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 02:48:48,332 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 02:48:48,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 02:48:47" (1/3) ... [2023-04-01 02:48:48,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f437df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:48:48, skipping insertion in model container [2023-04-01 02:48:48,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:47" (2/3) ... [2023-04-01 02:48:48,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f437df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:48:48, skipping insertion in model container [2023-04-01 02:48:48,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:48:48" (3/3) ... [2023-04-01 02:48:48,334 INFO L112 eAbstractionObserver]: Analyzing ICFG copysome1-2.i [2023-04-01 02:48:48,351 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 02:48:48,351 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 02:48:48,382 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 02:48:48,386 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;@1bb149a9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 02:48:48,386 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 02:48:48,389 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 02:48:48,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 02:48:48,394 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:48,395 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:48,396 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:48,402 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:48,402 INFO L85 PathProgramCache]: Analyzing trace with hash 1709835991, now seen corresponding path program 1 times [2023-04-01 02:48:48,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:48,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436102800] [2023-04-01 02:48:48,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:48,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:48,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:48,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:48,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:48,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436102800] [2023-04-01 02:48:48,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436102800] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:48:48,648 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 02:48:48,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 02:48:48,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730679668] [2023-04-01 02:48:48,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:48:48,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 02:48:48,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:48,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 02:48:48,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:48:48,677 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:48,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:48,718 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2023-04-01 02:48:48,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 02:48:48,719 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 13 [2023-04-01 02:48:48,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:48,723 INFO L225 Difference]: With dead ends: 38 [2023-04-01 02:48:48,723 INFO L226 Difference]: Without dead ends: 20 [2023-04-01 02:48:48,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:48:48,729 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:48,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:48:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-01 02:48:48,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-01 02:48:48,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:48:48,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-04-01 02:48:48,754 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2023-04-01 02:48:48,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:48,754 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-04-01 02:48:48,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:48,755 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-04-01 02:48:48,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 02:48:48,755 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:48,755 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:48,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 02:48:48,756 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:48,757 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:48,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1937127748, now seen corresponding path program 1 times [2023-04-01 02:48:48,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:48,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067146558] [2023-04-01 02:48:48,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:48,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:48,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:48:48,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:48,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067146558] [2023-04-01 02:48:48,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067146558] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:48,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121436936] [2023-04-01 02:48:48,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:48,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:48,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:48,912 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:48,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 02:48:48,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:48,968 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 02:48:48,972 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:48,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:48:48,999 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:49,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:48:49,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121436936] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:49,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404541192] [2023-04-01 02:48:49,031 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 02:48:49,031 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:49,034 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:49,037 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:49,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:49,089 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:48:49,362 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:48:49,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:48:49,403 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:49,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '205#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_1| Int) (|v_main_~#a2~0.base_BEFORE_CALL_1| Int)) (and (<= 2 |v_main_~#a2~0.base_BEFORE_CALL_1|) (<= 4 (+ |v_main_~#a2~0.base_BEFORE_CALL_1| |v_main_~#a1~0.base_BEFORE_CALL_1|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_1|)) (<= 3 (+ |v_main_~#a2~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_1|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_1|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#a2~0.base_BEFORE_CALL_1|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a2~0.base_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:49,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:49,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:49,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 02:48:49,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548281702] [2023-04-01 02:48:49,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:49,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 02:48:49,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:49,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 02:48:49,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2023-04-01 02:48:49,744 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:49,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:49,776 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2023-04-01 02:48:49,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 02:48:49,777 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 15 [2023-04-01 02:48:49,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:49,778 INFO L225 Difference]: With dead ends: 39 [2023-04-01 02:48:49,778 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 02:48:49,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2023-04-01 02:48:49,779 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:49,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:48:49,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 02:48:49,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-01 02:48:49,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:48:49,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-04-01 02:48:49,783 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 15 [2023-04-01 02:48:49,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:49,783 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-04-01 02:48:49,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:49,783 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-04-01 02:48:49,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 02:48:49,784 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:49,784 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:49,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:49,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:49,989 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:49,990 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:49,990 INFO L85 PathProgramCache]: Analyzing trace with hash 19115415, now seen corresponding path program 2 times [2023-04-01 02:48:49,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:49,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470649082] [2023-04-01 02:48:49,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:49,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:50,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:50,175 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:48:50,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:50,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470649082] [2023-04-01 02:48:50,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470649082] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:50,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142968405] [2023-04-01 02:48:50,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:50,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:50,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:50,194 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:50,232 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 02:48:50,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 02:48:50,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:50,277 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 02:48:50,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:50,308 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:48:50,308 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:50,372 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:48:50,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142968405] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:50,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220186344] [2023-04-01 02:48:50,377 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 02:48:50,377 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:50,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:50,377 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:50,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:50,403 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:48:50,547 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:48:50,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:48:50,570 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:50,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '455#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_2| Int) (|v_main_~#a2~0.base_BEFORE_CALL_2| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_2|)) (<= 3 (+ |v_main_~#a2~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (<= 2 |v_main_~#a2~0.base_BEFORE_CALL_2|) (<= 4 (+ |v_main_~#a2~0.base_BEFORE_CALL_2| |v_main_~#a1~0.base_BEFORE_CALL_2|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a2~0.base_BEFORE_CALL_2|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_2|) (not (= (select (select |#memory_int| |v_main_~#a2~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_2|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_2|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:50,865 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:50,865 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:50,865 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-01 02:48:50,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205661906] [2023-04-01 02:48:50,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:50,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 02:48:50,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:50,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 02:48:50,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2023-04-01 02:48:50,868 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:50,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:50,919 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2023-04-01 02:48:50,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 02:48:50,919 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 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 21 [2023-04-01 02:48:50,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:50,921 INFO L225 Difference]: With dead ends: 54 [2023-04-01 02:48:50,921 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 02:48:50,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2023-04-01 02:48:50,923 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:50,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:48:50,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 02:48:50,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-04-01 02:48:50,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:48:50,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2023-04-01 02:48:50,938 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 21 [2023-04-01 02:48:50,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:50,939 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2023-04-01 02:48:50,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:50,939 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2023-04-01 02:48:50,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-01 02:48:50,940 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:50,940 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:50,961 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 02:48:51,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 02:48:51,145 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:51,145 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:51,145 INFO L85 PathProgramCache]: Analyzing trace with hash -692106313, now seen corresponding path program 3 times [2023-04-01 02:48:51,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:51,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074396895] [2023-04-01 02:48:51,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:51,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:51,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:51,400 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 02:48:51,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:51,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074396895] [2023-04-01 02:48:51,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074396895] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:51,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640330891] [2023-04-01 02:48:51,401 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:48:51,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:51,401 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:51,422 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:51,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 02:48:51,524 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:48:51,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:51,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 02:48:51,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:51,549 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 02:48:51,550 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:51,736 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 02:48:51,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640330891] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:51,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2021543831] [2023-04-01 02:48:51,738 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 02:48:51,738 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:51,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:51,739 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:51,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:51,758 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:48:51,848 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:48:51,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:48:51,863 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:52,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '843#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_3| Int) (|v_main_~#a2~0.base_BEFORE_CALL_3| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a2~0.base_BEFORE_CALL_3|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_3|)) (not (= (select (select |#memory_int| |v_main_~#a2~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_3|) 0))) (<= 2 |v_main_~#a2~0.base_BEFORE_CALL_3|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_3|) (<= 3 (+ |v_main_~#a2~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)) (<= 4 (+ |v_main_~#a2~0.base_BEFORE_CALL_3| |v_main_~#a1~0.base_BEFORE_CALL_3|)) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_3|))) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:52,197 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:52,197 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:52,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-01 02:48:52,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638983517] [2023-04-01 02:48:52,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:52,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 02:48:52,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:52,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 02:48:52,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=858, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 02:48:52,200 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:52,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:52,304 INFO L93 Difference]: Finished difference Result 84 states and 113 transitions. [2023-04-01 02:48:52,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 02:48:52,304 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 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 33 [2023-04-01 02:48:52,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:52,305 INFO L225 Difference]: With dead ends: 84 [2023-04-01 02:48:52,305 INFO L226 Difference]: Without dead ends: 62 [2023-04-01 02:48:52,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=332, Invalid=858, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 02:48:52,307 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:52,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:48:52,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-04-01 02:48:52,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2023-04-01 02:48:52,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 56 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:48:52,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2023-04-01 02:48:52,314 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 33 [2023-04-01 02:48:52,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:52,314 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2023-04-01 02:48:52,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:52,314 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2023-04-01 02:48:52,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-01 02:48:52,315 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:52,315 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:52,321 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 02:48:52,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:52,522 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:52,522 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:52,522 INFO L85 PathProgramCache]: Analyzing trace with hash 554528759, now seen corresponding path program 4 times [2023-04-01 02:48:52,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:52,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005908589] [2023-04-01 02:48:52,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:52,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:52,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:53,259 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-01 02:48:53,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:53,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005908589] [2023-04-01 02:48:53,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005908589] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:53,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193832503] [2023-04-01 02:48:53,259 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:48:53,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:53,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:53,260 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:53,264 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 02:48:53,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:53,452 INFO L262 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 02:48:53,455 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:53,498 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-01 02:48:53,498 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:54,109 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-01 02:48:54,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193832503] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:54,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [301119805] [2023-04-01 02:48:54,111 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 02:48:54,111 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:54,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:54,112 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:54,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:54,136 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:48:54,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:48:54,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:48:54,249 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:54,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1507#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_4| Int) (|v_main_~#a2~0.base_BEFORE_CALL_4| Int)) (and (<= 2 |v_main_~#a2~0.base_BEFORE_CALL_4|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a2~0.base_BEFORE_CALL_4|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_4|)) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_4|) (not (= (select (select |#memory_int| |v_main_~#a2~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_4|) 0))) (<= 4 (+ |v_main_~#a2~0.base_BEFORE_CALL_4| |v_main_~#a1~0.base_BEFORE_CALL_4|)) (<= 3 (+ |v_main_~#a2~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_4|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:54,633 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:54,633 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:54,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-01 02:48:54,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794036829] [2023-04-01 02:48:54,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:54,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 02:48:54,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:54,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 02:48:54,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1208, Invalid=2214, Unknown=0, NotChecked=0, Total=3422 [2023-04-01 02:48:54,636 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 49 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:54,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:54,834 INFO L93 Difference]: Finished difference Result 144 states and 197 transitions. [2023-04-01 02:48:54,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-01 02:48:54,835 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 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 57 [2023-04-01 02:48:54,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:54,836 INFO L225 Difference]: With dead ends: 144 [2023-04-01 02:48:54,836 INFO L226 Difference]: Without dead ends: 110 [2023-04-01 02:48:54,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1208, Invalid=2214, Unknown=0, NotChecked=0, Total=3422 [2023-04-01 02:48:54,838 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:54,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 02:48:54,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-04-01 02:48:54,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2023-04-01 02:48:54,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0384615384615385) internal successors, (108), 104 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:48:54,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 113 transitions. [2023-04-01 02:48:54,847 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 113 transitions. Word has length 57 [2023-04-01 02:48:54,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:54,847 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 113 transitions. [2023-04-01 02:48:54,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:54,848 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 113 transitions. [2023-04-01 02:48:54,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-04-01 02:48:54,850 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:54,850 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:54,859 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-01 02:48:55,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:55,056 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:55,056 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:55,056 INFO L85 PathProgramCache]: Analyzing trace with hash -83011465, now seen corresponding path program 5 times [2023-04-01 02:48:55,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:55,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871389313] [2023-04-01 02:48:55,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:55,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:55,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:57,257 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-01 02:48:57,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:57,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871389313] [2023-04-01 02:48:57,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871389313] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:57,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482371868] [2023-04-01 02:48:57,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:57,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:57,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:57,261 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:57,267 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process