/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/verifythis/prefixsum_rec.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 00:04:39,193 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 00:04:39,196 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 00:04:39,230 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 00:04:39,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 00:04:39,232 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 00:04:39,233 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 00:04:39,234 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 00:04:39,235 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 00:04:39,236 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 00:04:39,237 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 00:04:39,238 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 00:04:39,238 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 00:04:39,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 00:04:39,240 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 00:04:39,241 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 00:04:39,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 00:04:39,242 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 00:04:39,243 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 00:04:39,245 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 00:04:39,246 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 00:04:39,247 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 00:04:39,248 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 00:04:39,249 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 00:04:39,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 00:04:39,252 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 00:04:39,253 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 00:04:39,253 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 00:04:39,254 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 00:04:39,255 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 00:04:39,255 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 00:04:39,255 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 00:04:39,256 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 00:04:39,257 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 00:04:39,257 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 00:04:39,258 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 00:04:39,258 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 00:04:39,258 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 00:04:39,259 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 00:04:39,259 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 00:04:39,260 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 00:04:39,261 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 00:04:39,280 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 00:04:39,280 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 00:04:39,280 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 00:04:39,280 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 00:04:39,281 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 00:04:39,281 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 00:04:39,281 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 00:04:39,281 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 00:04:39,282 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 00:04:39,283 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 00:04:39,283 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 00:04:39,283 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 00:04:39,283 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 00:04:39,283 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 00:04:39,284 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 00:04:39,285 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 00:04:39,285 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 00:04:39,285 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 00:04:39,285 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 00:04:39,285 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 00:04:39,285 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 00:04:39,285 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 00:04:39,286 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 00:04:39,287 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-04-01 00:04:39,470 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 00:04:39,493 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 00:04:39,495 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 00:04:39,496 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 00:04:39,496 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 00:04:39,497 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/prefixsum_rec.c [2023-04-01 00:04:40,725 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 00:04:40,921 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 00:04:40,921 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/prefixsum_rec.c [2023-04-01 00:04:40,927 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/744175a2e/057b98b512fc4ab598c996869137765a/FLAGfaeea66fd [2023-04-01 00:04:40,943 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/744175a2e/057b98b512fc4ab598c996869137765a [2023-04-01 00:04:40,946 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 00:04:40,948 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 00:04:40,950 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 00:04:40,951 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 00:04:40,953 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 00:04:40,954 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:04:40" (1/1) ... [2023-04-01 00:04:40,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@456bca1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:40, skipping insertion in model container [2023-04-01 00:04:40,956 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:04:40" (1/1) ... [2023-04-01 00:04:40,962 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 00:04:40,975 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 00:04:41,129 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/verifythis/prefixsum_rec.c[525,538] [2023-04-01 00:04:41,167 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 00:04:41,176 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 00:04:41,185 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/verifythis/prefixsum_rec.c[525,538] [2023-04-01 00:04:41,196 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 00:04:41,207 INFO L208 MainTranslator]: Completed translation [2023-04-01 00:04:41,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41 WrapperNode [2023-04-01 00:04:41,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 00:04:41,209 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 00:04:41,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 00:04:41,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 00:04:41,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,246 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,249 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,251 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,252 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,254 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 00:04:41,255 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 00:04:41,255 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 00:04:41,255 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 00:04:41,256 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (1/1) ... [2023-04-01 00:04:41,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 00:04:41,275 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:04:41,289 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 00:04:41,295 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 00:04:41,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure upsweep [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure downsweep [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure is_pow2 [2023-04-01 00:04:41,319 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2023-04-01 00:04:41,320 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 00:04:41,320 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 00:04:41,320 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure upsweep [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure downsweep [2023-04-01 00:04:41,321 INFO L130 BoogieDeclarations]: Found specification of procedure is_pow2 [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure check [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 00:04:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 00:04:41,398 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 00:04:41,400 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 00:04:41,715 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 00:04:41,780 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 00:04:41,780 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 00:04:41,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:04:41 BoogieIcfgContainer [2023-04-01 00:04:41,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 00:04:41,784 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 00:04:41,784 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 00:04:41,794 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 00:04:41,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 12:04:40" (1/3) ... [2023-04-01 00:04:41,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c52c920 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:04:41, skipping insertion in model container [2023-04-01 00:04:41,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:04:41" (2/3) ... [2023-04-01 00:04:41,796 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c52c920 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:04:41, skipping insertion in model container [2023-04-01 00:04:41,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:04:41" (3/3) ... [2023-04-01 00:04:41,800 INFO L112 eAbstractionObserver]: Analyzing ICFG prefixsum_rec.c [2023-04-01 00:04:41,817 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 00:04:41,817 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 00:04:41,877 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 00:04:41,885 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;@5bc89ee9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 00:04:41,885 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 00:04:41,895 INFO L276 IsEmpty]: Start isEmpty. Operand has 53 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 30 states have internal predecessors, (34), 15 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-01 00:04:41,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-01 00:04:41,907 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:04:41,908 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:04:41,908 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:04:41,914 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:04:41,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1467194720, now seen corresponding path program 1 times [2023-04-01 00:04:41,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:04:41,921 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077561245] [2023-04-01 00:04:41,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:41,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:04:42,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:42,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 00:04:42,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:04:42,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077561245] [2023-04-01 00:04:42,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2077561245] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:04:42,528 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:04:42,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-01 00:04:42,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573060429] [2023-04-01 00:04:42,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:04:42,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-01 00:04:42,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:04:42,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-01 00:04:42,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-01 00:04:42,579 INFO L87 Difference]: Start difference. First operand has 53 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 30 states have internal predecessors, (34), 15 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-01 00:04:42,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:04:42,744 INFO L93 Difference]: Finished difference Result 77 states and 95 transitions. [2023-04-01 00:04:42,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 00:04:42,746 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 44 [2023-04-01 00:04:42,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:04:42,753 INFO L225 Difference]: With dead ends: 77 [2023-04-01 00:04:42,753 INFO L226 Difference]: Without dead ends: 49 [2023-04-01 00:04:42,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-01 00:04:42,759 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 7 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 00:04:42,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 232 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 00:04:42,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-01 00:04:42,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-04-01 00:04:42,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 15 states have call successors, (15), 9 states have call predecessors, (15), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-01 00:04:42,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2023-04-01 00:04:42,797 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 44 [2023-04-01 00:04:42,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:04:42,798 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2023-04-01 00:04:42,799 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-01 00:04:42,799 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2023-04-01 00:04:42,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 00:04:42,801 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:04:42,801 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:04:42,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 00:04:42,802 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:04:42,802 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:04:42,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1431458385, now seen corresponding path program 1 times [2023-04-01 00:04:42,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:04:42,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319141403] [2023-04-01 00:04:42,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:42,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:04:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:43,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 00:04:43,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:04:43,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319141403] [2023-04-01 00:04:43,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319141403] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:04:43,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584137914] [2023-04-01 00:04:43,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:43,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:04:43,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:04:43,032 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 00:04:43,058 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 00:04:43,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:43,189 INFO L262 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 00:04:43,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:04:43,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 00:04:43,346 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:04:43,460 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 00:04:43,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584137914] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 00:04:43,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734308204] [2023-04-01 00:04:43,478 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-01 00:04:43,479 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:04:43,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 00:04:43,503 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 00:04:43,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 00:04:43,569 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-04-01 00:04:44,096 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 33 for LOIs [2023-04-01 00:04:44,116 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 17 for LOIs [2023-04-01 00:04:44,140 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-01 00:04:44,148 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 22 for LOIs [2023-04-01 00:04:44,151 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2023-04-01 00:04:44,154 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 24 for LOIs [2023-04-01 00:04:44,167 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-01 00:04:44,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 00:04:44,178 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 00:04:45,984 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '533#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_1| Int)) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_1|) 0) 0))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-04-01 00:04:45,985 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 00:04:45,985 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 00:04:45,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2023-04-01 00:04:45,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538057846] [2023-04-01 00:04:45,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 00:04:45,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 00:04:45,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:04:45,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 00:04:45,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1715, Unknown=5, NotChecked=0, Total=1892 [2023-04-01 00:04:45,988 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 10 states have internal predecessors, (39), 4 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) [2023-04-01 00:04:46,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:04:46,142 INFO L93 Difference]: Finished difference Result 76 states and 93 transitions. [2023-04-01 00:04:46,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 00:04:46,143 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 10 states have internal predecessors, (39), 4 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) Word has length 45 [2023-04-01 00:04:46,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:04:46,146 INFO L225 Difference]: With dead ends: 76 [2023-04-01 00:04:46,146 INFO L226 Difference]: Without dead ends: 50 [2023-04-01 00:04:46,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 94 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=181, Invalid=1794, Unknown=5, NotChecked=0, Total=1980 [2023-04-01 00:04:46,149 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 4 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 00:04:46,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 266 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 00:04:46,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-04-01 00:04:46,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-04-01 00:04:46,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 29 states have internal predecessors, (32), 15 states have call successors, (15), 9 states have call predecessors, (15), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-01 00:04:46,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-04-01 00:04:46,169 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 45 [2023-04-01 00:04:46,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:04:46,170 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-04-01 00:04:46,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 10 states have internal predecessors, (39), 4 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) [2023-04-01 00:04:46,170 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-04-01 00:04:46,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 00:04:46,175 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:04:46,175 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:04:46,186 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 00:04:46,381 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 00:04:46,382 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:04:46,382 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:04:46,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1095391424, now seen corresponding path program 2 times [2023-04-01 00:04:46,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:04:46,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338046980] [2023-04-01 00:04:46,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:46,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:04:46,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:48,555 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 00:04:48,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:04:48,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338046980] [2023-04-01 00:04:48,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338046980] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:04:48,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517917653] [2023-04-01 00:04:48,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 00:04:48,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:04:48,556 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:04:48,559 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 00:04:48,582 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 00:04:48,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 00:04:48,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 00:04:48,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 53 conjunts are in the unsatisfiable core [2023-04-01 00:04:48,670 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:04:48,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-01 00:04:48,875 WARN L861 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_81 Int) (downsweep_~left Int)) (and (<= |c_downsweep_#in~right| (+ downsweep_~left 1)) (= (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse0 (select |c_old(#memory_int)| |c_downsweep_#in~a.base|)) (.cse1 (+ |c_downsweep_#in~a.offset| (* |c_downsweep_#in~right| 4)))) (store (store .cse0 .cse1 v_ArrVal_81) (+ |c_downsweep_#in~a.offset| (* downsweep_~left 4)) (select .cse0 .cse1)))) |c_#memory_int|) (<= downsweep_~left |c_downsweep_#in~left|))) is different from true [2023-04-01 00:04:48,906 INFO L321 Elim1Store]: treesize reduction 26, result has 31.6 percent of original size [2023-04-01 00:04:48,907 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 27 [2023-04-01 00:04:49,138 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 00:04:49,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 10 [2023-04-01 00:04:49,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 00:04:49,239 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:04:49,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517917653] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:04:49,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681649406] [2023-04-01 00:04:49,549 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-01 00:04:49,549 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:04:49,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 00:04:49,550 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 00:04:49,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 00:04:49,572 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-04-01 00:04:49,932 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 33 for LOIs [2023-04-01 00:04:49,954 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 17 for LOIs [2023-04-01 00:04:49,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-01 00:04:49,991 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 22 for LOIs [2023-04-01 00:04:49,993 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2023-04-01 00:04:49,998 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 24 for LOIs [2023-04-01 00:04:50,012 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-01 00:04:50,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 00:04:50,026 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 00:04:52,558 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '963#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_2| Int)) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_2|) 0) 0))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-04-01 00:04:52,558 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 00:04:52,558 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 00:04:52,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15] total 34 [2023-04-01 00:04:52,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350886083] [2023-04-01 00:04:52,559 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 00:04:52,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-01 00:04:52,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:04:52,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-01 00:04:52,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=4674, Unknown=4, NotChecked=138, Total=5112 [2023-04-01 00:04:52,563 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 34 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 25 states have internal predecessors, (44), 11 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2023-04-01 00:04:54,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:04:54,920 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2023-04-01 00:04:54,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-01 00:04:54,920 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 25 states have internal predecessors, (44), 11 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) Word has length 46 [2023-04-01 00:04:54,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:04:54,923 INFO L225 Difference]: With dead ends: 78 [2023-04-01 00:04:54,923 INFO L226 Difference]: Without dead ends: 76 [2023-04-01 00:04:54,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2584 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=532, Invalid=8210, Unknown=4, NotChecked=184, Total=8930 [2023-04-01 00:04:54,927 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 155 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 866 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-01 00:04:54,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 170 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 866 Invalid, 0 Unknown, 93 Unchecked, 0.9s Time] [2023-04-01 00:04:54,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-01 00:04:54,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 60. [2023-04-01 00:04:54,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 35 states have internal predecessors, (38), 17 states have call successors, (17), 11 states have call predecessors, (17), 9 states have return successors, (17), 14 states have call predecessors, (17), 14 states have call successors, (17) [2023-04-01 00:04:54,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2023-04-01 00:04:54,941 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 46 [2023-04-01 00:04:54,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:04:54,941 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2023-04-01 00:04:54,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 25 states have internal predecessors, (44), 11 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2023-04-01 00:04:54,941 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2023-04-01 00:04:54,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-01 00:04:54,943 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:04:54,943 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:04:54,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 00:04:55,148 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 00:04:55,149 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:04:55,149 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:04:55,149 INFO L85 PathProgramCache]: Analyzing trace with hash 965693350, now seen corresponding path program 1 times [2023-04-01 00:04:55,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:04:55,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370992815] [2023-04-01 00:04:55,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:55,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:04:55,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:55,357 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 00:04:55,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:04:55,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370992815] [2023-04-01 00:04:55,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370992815] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:04:55,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711886567] [2023-04-01 00:04:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:04:55,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:04:55,358 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:04:55,359 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 00:04:55,361 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 00:04:55,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:04:55,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 108 conjunts are in the unsatisfiable core [2023-04-01 00:04:55,451 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:04:55,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 00:04:55,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2023-04-01 00:04:55,530 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 00:04:55,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 00:04:55,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 00:04:55,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2023-04-01 00:04:55,668 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 33 [2023-04-01 00:04:55,822 WARN L861 $PredicateComparison]: unable to prove that (exists ((upsweep_~right Int) (upsweep_~a.offset Int) (v_ArrVal_129 Int)) (and (<= |c_upsweep_#in~right| upsweep_~right) (= (store |c_old(#memory_int)| |c_upsweep_#in~a.base| (store (select |c_old(#memory_int)| |c_upsweep_#in~a.base|) (+ (* upsweep_~right 4) upsweep_~a.offset) v_ArrVal_129)) |c_#memory_int|) (<= upsweep_~right (+ |c_upsweep_#in~left| 1)) (<= |c_upsweep_#in~a.offset| upsweep_~a.offset))) is different from true [2023-04-01 00:04:55,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 42 [2023-04-01 00:04:55,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 50 [2023-04-01 00:04:56,009 WARN L861 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_133 Int)) (= |c_#memory_int| (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse2 (+ |c_downsweep_#in~a.offset| (* |c_downsweep_#in~left| 4)))) (store (let ((.cse1 (+ |c_downsweep_#in~a.offset| (* |c_downsweep_#in~right| 4))) (.cse0 (select |c_old(#memory_int)| |c_downsweep_#in~a.base|))) (store .cse0 .cse1 (+ (select .cse0 .cse1) (select .cse0 .cse2)))) .cse2 v_ArrVal_133))))) is different from true [2023-04-01 00:04:56,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 97 treesize of output 91 [2023-04-01 00:04:57,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 97 treesize of output 89 [2023-04-01 00:04:57,321 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 00:04:57,321 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:05:23,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711886567] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:23,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [882333123] [2023-04-01 00:05:23,624 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-04-01 00:05:23,624 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:05:23,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 00:05:23,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 00:05:23,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 00:05:23,642 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-04-01 00:05:23,951 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 33 for LOIs [2023-04-01 00:05:23,969 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 17 for LOIs [2023-04-01 00:05:24,112 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-01 00:05:24,130 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 22 for LOIs [2023-04-01 00:05:24,132 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2023-04-01 00:05:24,135 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 24 for LOIs [2023-04-01 00:05:24,145 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-01 00:05:24,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 00:05:24,156 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 00:05:27,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1477#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-04-01 00:05:27,498 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 00:05:27,498 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 00:05:27,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 30] total 36 [2023-04-01 00:05:27,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753624543] [2023-04-01 00:05:27,498 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 00:05:27,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-01 00:05:27,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:05:27,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-01 00:05:27,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=5253, Unknown=18, NotChecked=294, Total=5852 [2023-04-01 00:05:27,501 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 36 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 states have internal predecessors, (56), 10 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2023-04-01 00:05:29,678 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((upsweep_~right Int) (upsweep_~a.offset Int) (v_ArrVal_129 Int)) (and (<= |c_upsweep_#in~right| upsweep_~right) (= (store |c_old(#memory_int)| |c_upsweep_#in~a.base| (store (select |c_old(#memory_int)| |c_upsweep_#in~a.base|) (+ (* upsweep_~right 4) upsweep_~a.offset) v_ArrVal_129)) |c_#memory_int|) (<= upsweep_~right (+ |c_upsweep_#in~left| 1)) (<= |c_upsweep_#in~a.offset| upsweep_~a.offset))) (exists ((|v_main_#t~malloc15.base_BEFORE_CALL_13| Int)) (= (select |c_#valid| |v_main_#t~malloc15.base_BEFORE_CALL_13|) 1))) is different from true [2023-04-01 00:05:33,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:05:33,179 INFO L93 Difference]: Finished difference Result 187 states and 242 transitions. [2023-04-01 00:05:33,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2023-04-01 00:05:33,179 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 states have internal predecessors, (56), 10 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) Word has length 53 [2023-04-01 00:05:33,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:05:33,182 INFO L225 Difference]: With dead ends: 187 [2023-04-01 00:05:33,182 INFO L226 Difference]: Without dead ends: 151 [2023-04-01 00:05:33,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 3863 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=718, Invalid=12845, Unknown=21, NotChecked=696, Total=14280 [2023-04-01 00:05:33,187 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 131 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 2162 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 2162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 830 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-04-01 00:05:33,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 538 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 2162 Invalid, 0 Unknown, 830 Unchecked, 2.8s Time] [2023-04-01 00:05:33,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-04-01 00:05:33,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 105. [2023-04-01 00:05:33,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 59 states have (on average 1.152542372881356) internal successors, (68), 63 states have internal predecessors, (68), 29 states have call successors, (29), 15 states have call predecessors, (29), 16 states have return successors, (43), 26 states have call predecessors, (43), 25 states have call successors, (43) [2023-04-01 00:05:33,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 140 transitions. [2023-04-01 00:05:33,244 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 140 transitions. Word has length 53 [2023-04-01 00:05:33,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:05:33,245 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 140 transitions. [2023-04-01 00:05:33,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 states have internal predecessors, (56), 10 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2023-04-01 00:05:33,247 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 140 transitions. [2023-04-01 00:05:33,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-01 00:05:33,255 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:05:33,255 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:05:33,265 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 00:05:33,463 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 00:05:33,463 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:05:33,465 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:05:33,465 INFO L85 PathProgramCache]: Analyzing trace with hash -1848805611, now seen corresponding path program 2 times [2023-04-01 00:05:33,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:05:33,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808428238] [2023-04-01 00:05:33,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:33,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:05:33,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:33,621 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 00:05:33,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:05:33,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808428238] [2023-04-01 00:05:33,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808428238] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:33,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331598338] [2023-04-01 00:05:33,622 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 00:05:33,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:33,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:05:33,623 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 00:05:33,626 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 00:05:33,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 00:05:33,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 00:05:33,758 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 38 conjunts are in the unsatisfiable core [2023-04-01 00:05:33,760 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:05:34,150 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 00:05:34,150 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:05:34,637 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 00:05:34,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331598338] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:34,637 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-01 00:05:34,638 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [8, 13] total 29 [2023-04-01 00:05:34,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040628747] [2023-04-01 00:05:34,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:05:34,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 00:05:34,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:05:34,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 00:05:34,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2023-04-01 00:05:34,639 INFO L87 Difference]: Start difference. First operand 105 states and 140 transitions. Second operand has 13 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (12), 3 states have call predecessors, (12), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2023-04-01 00:05:34,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:05:34,968 INFO L93 Difference]: Finished difference Result 127 states and 171 transitions. [2023-04-01 00:05:34,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 00:05:34,968 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (12), 3 states have call predecessors, (12), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 54 [2023-04-01 00:05:34,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:05:34,970 INFO L225 Difference]: With dead ends: 127 [2023-04-01 00:05:34,970 INFO L226 Difference]: Without dead ends: 112 [2023-04-01 00:05:34,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=96, Invalid=896, Unknown=0, NotChecked=0, Total=992 [2023-04-01 00:05:34,972 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 00:05:34,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 304 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 00:05:34,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-01 00:05:34,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2023-04-01 00:05:34,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 62 states have (on average 1.1612903225806452) internal successors, (72), 67 states have internal predecessors, (72), 32 states have call successors, (32), 15 states have call predecessors, (32), 16 states have return successors, (48), 28 states have call predecessors, (48), 28 states have call successors, (48) [2023-04-01 00:05:35,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 152 transitions. [2023-04-01 00:05:35,001 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 152 transitions. Word has length 54 [2023-04-01 00:05:35,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:05:35,001 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 152 transitions. [2023-04-01 00:05:35,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (12), 3 states have call predecessors, (12), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2023-04-01 00:05:35,001 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 152 transitions. [2023-04-01 00:05:35,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-01 00:05:35,004 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:05:35,004 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:05:35,011 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 00:05:35,210 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 00:05:35,211 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:05:35,211 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:05:35,211 INFO L85 PathProgramCache]: Analyzing trace with hash 963372125, now seen corresponding path program 1 times [2023-04-01 00:05:35,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:05:35,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375699592] [2023-04-01 00:05:35,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:35,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:05:35,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:35,371 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-01 00:05:35,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:05:35,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375699592] [2023-04-01 00:05:35,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375699592] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:35,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973281403] [2023-04-01 00:05:35,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:35,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:35,372 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:05:35,373 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 00:05:35,399 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 00:05:35,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:35,470 INFO L262 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-01 00:05:35,473 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:05:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 00:05:35,506 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:05:35,643 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-01 00:05:35,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973281403] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 00:05:35,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [85578563] [2023-04-01 00:05:35,648 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-04-01 00:05:35,648 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:05:35,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 00:05:35,648 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 00:05:35,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 00:05:35,664 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-04-01 00:05:35,935 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 33 for LOIs [2023-04-01 00:05:35,950 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 17 for LOIs [2023-04-01 00:05:36,067 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-01 00:05:36,083 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 22 for LOIs [2023-04-01 00:05:36,085 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 16 for LOIs [2023-04-01 00:05:36,087 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 24 for LOIs [2023-04-01 00:05:36,096 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-01 00:05:36,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 00:05:36,111 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 00:05:37,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3111#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-04-01 00:05:37,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 00:05:37,760 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 00:05:37,760 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2023-04-01 00:05:37,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896082894] [2023-04-01 00:05:37,760 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 00:05:37,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 00:05:37,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:05:37,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 00:05:37,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1961, Unknown=3, NotChecked=0, Total=2162 [2023-04-01 00:05:37,762 INFO L87 Difference]: Start difference. First operand 111 states and 152 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2023-04-01 00:05:37,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:05:37,944 INFO L93 Difference]: Finished difference Result 142 states and 188 transitions. [2023-04-01 00:05:37,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 00:05:37,949 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) Word has length 55 [2023-04-01 00:05:37,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:05:37,950 INFO L225 Difference]: With dead ends: 142 [2023-04-01 00:05:37,950 INFO L226 Difference]: Without dead ends: 111 [2023-04-01 00:05:37,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 121 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=213, Invalid=2136, Unknown=3, NotChecked=0, Total=2352 [2023-04-01 00:05:37,953 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 00:05:37,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 370 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 00:05:37,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-04-01 00:05:37,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 107. [2023-04-01 00:05:37,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 60 states have (on average 1.1666666666666667) internal successors, (70), 65 states have internal predecessors, (70), 30 states have call successors, (30), 15 states have call predecessors, (30), 16 states have return successors, (43), 26 states have call predecessors, (43), 26 states have call successors, (43) [2023-04-01 00:05:37,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 143 transitions. [2023-04-01 00:05:37,978 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 143 transitions. Word has length 55 [2023-04-01 00:05:37,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:05:37,978 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 143 transitions. [2023-04-01 00:05:37,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2023-04-01 00:05:37,978 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 143 transitions. [2023-04-01 00:05:37,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-01 00:05:37,979 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:05:37,979 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:05:37,993 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 00:05:38,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:38,186 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:05:38,187 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:05:38,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1302590376, now seen corresponding path program 1 times [2023-04-01 00:05:38,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:05:38,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085967659] [2023-04-01 00:05:38,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:38,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:05:38,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:38,364 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 00:05:38,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:05:38,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085967659] [2023-04-01 00:05:38,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085967659] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:38,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000125534] [2023-04-01 00:05:38,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:38,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:38,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:05:38,367 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 00:05:38,392 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 00:05:38,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:38,477 INFO L262 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-01 00:05:38,481 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:05:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 00:05:38,580 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:05:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-01 00:05:38,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000125534] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 00:05:38,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136968417] [2023-04-01 00:05:38,945 INFO L159 IcfgInterpreter]: Started Sifa with 43 locations of interest [2023-04-01 00:05:38,945 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:05:38,946 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 00:05:38,952 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 00:05:38,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 7] total 19 [2023-04-01 00:05:38,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766892547] [2023-04-01 00:05:38,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 00:05:38,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 00:05:38,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:05:38,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 00:05:38,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2023-04-01 00:05:38,955 INFO L87 Difference]: Start difference. First operand 107 states and 143 transitions. Second operand has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 7 states have call successors, (18), 2 states have call predecessors, (18), 5 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-04-01 00:05:39,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:05:39,276 INFO L93 Difference]: Finished difference Result 130 states and 175 transitions. [2023-04-01 00:05:39,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 00:05:39,276 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 7 states have call successors, (18), 2 states have call predecessors, (18), 5 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 57 [2023-04-01 00:05:39,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:05:39,278 INFO L225 Difference]: With dead ends: 130 [2023-04-01 00:05:39,278 INFO L226 Difference]: Without dead ends: 115 [2023-04-01 00:05:39,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2023-04-01 00:05:39,279 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 23 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 00:05:39,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 306 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 00:05:39,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-04-01 00:05:39,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 112. [2023-04-01 00:05:39,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 67 states have internal predecessors, (73), 32 states have call successors, (32), 16 states have call predecessors, (32), 16 states have return successors, (46), 28 states have call predecessors, (46), 28 states have call successors, (46) [2023-04-01 00:05:39,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 151 transitions. [2023-04-01 00:05:39,308 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 151 transitions. Word has length 57 [2023-04-01 00:05:39,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:05:39,308 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 151 transitions. [2023-04-01 00:05:39,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 7 states have call successors, (18), 2 states have call predecessors, (18), 5 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-04-01 00:05:39,308 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 151 transitions. [2023-04-01 00:05:39,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-04-01 00:05:39,310 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:05:39,310 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:05:39,322 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 00:05:39,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:39,523 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:05:39,523 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:05:39,523 INFO L85 PathProgramCache]: Analyzing trace with hash 1374598813, now seen corresponding path program 1 times [2023-04-01 00:05:39,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:05:39,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953429650] [2023-04-01 00:05:39,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:39,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:05:39,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:39,684 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-04-01 00:05:39,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:05:39,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953429650] [2023-04-01 00:05:39,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953429650] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:05:39,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947135468] [2023-04-01 00:05:39,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:05:39,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:05:39,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:05:39,689 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 00:05:39,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 00:05:39,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:05:39,805 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-01 00:05:39,808 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:05:39,844 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 00:05:39,844 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:05:39,991 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-04-01 00:05:39,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947135468] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 00:05:39,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1741996732] [2023-04-01 00:05:39,995 INFO L159 IcfgInterpreter]: Started Sifa with 46 locations of interest [2023-04-01 00:05:39,995 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 00:05:39,996 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 00:05:39,996 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 00:05:39,996 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2023-04-01 00:05:39,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655488721] [2023-04-01 00:05:39,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 00:05:39,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 00:05:39,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:05:39,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 00:05:39,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2023-04-01 00:05:39,998 INFO L87 Difference]: Start difference. First operand 112 states and 151 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 3 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13)