/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/verifythis/prefixsum_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:29:47,481 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:29:47,483 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:29:47,521 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:29:47,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:29:47,524 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:29:47,527 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:29:47,529 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:29:47,530 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:29:47,532 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:29:47,532 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:29:47,533 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:29:47,534 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:29:47,534 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:29:47,535 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:29:47,536 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:29:47,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:29:47,537 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:29:47,538 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:29:47,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:29:47,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:29:47,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:29:47,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:29:47,543 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:29:47,546 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:29:47,546 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:29:47,546 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:29:47,547 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:29:47,547 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:29:47,548 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:29:47,548 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:29:47,549 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:29:47,549 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:29:47,550 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:29:47,550 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:29:47,551 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:29:47,551 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:29:47,551 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:29:47,552 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:29:47,556 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:29:47,557 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:29:47,558 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 [2023-04-02 22:29:47,580 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:29:47,580 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:29:47,580 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:29:47,581 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:29:47,581 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:29:47,581 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:29:47,582 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:29:47,582 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:29:47,582 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:29:47,582 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:29:47,583 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:29:47,583 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:29:47,584 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:29:47,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:29:47,585 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:29:47,585 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:29:47,586 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:29:47,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:29:47,587 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:29:47,587 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:29:47,587 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:29:47,781 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:29:47,801 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:29:47,803 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:29:47,804 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:29:47,804 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:29:47,805 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/prefixsum_iter.c [2023-04-02 22:29:48,885 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:29:49,054 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:29:49,054 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/prefixsum_iter.c [2023-04-02 22:29:49,059 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e109466c2/c39259ed37544945aac2c0495b6f2d75/FLAGf7ad49871 [2023-04-02 22:29:49,071 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e109466c2/c39259ed37544945aac2c0495b6f2d75 [2023-04-02 22:29:49,073 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:29:49,074 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:29:49,076 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:29:49,076 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:29:49,086 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:29:49,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@710d9d6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49, skipping insertion in model container [2023-04-02 22:29:49,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:29:49,108 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:29:49,260 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_iter.c[526,539] [2023-04-02 22:29:49,287 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:29:49,296 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:29:49,305 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_iter.c[526,539] [2023-04-02 22:29:49,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:29:49,327 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:29:49,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49 WrapperNode [2023-04-02 22:29:49,328 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:29:49,329 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:29:49,329 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:29:49,329 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:29:49,339 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,346 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,347 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,355 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,360 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,361 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,362 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,364 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:29:49,365 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:29:49,365 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:29:49,365 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:29:49,366 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (1/1) ... [2023-04-02 22:29:49,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:29:49,380 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:29:49,396 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) [2023-04-02 22:29:49,398 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 [2023-04-02 22:29:49,425 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure upsweep [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure downsweep [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure is_pow2 [2023-04-02 22:29:49,426 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2023-04-02 22:29:49,427 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:29:49,427 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:29:49,427 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure upsweep [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure downsweep [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure is_pow2 [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure check [2023-04-02 22:29:49,428 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:29:49,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:29:49,498 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:29:49,500 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:29:49,831 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:29:49,923 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:29:49,924 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-04-02 22:29:49,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:29:49 BoogieIcfgContainer [2023-04-02 22:29:49,934 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:29:49,938 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:29:49,938 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:29:49,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:29:49,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:29:49" (1/3) ... [2023-04-02 22:29:49,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55b966e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:29:49, skipping insertion in model container [2023-04-02 22:29:49,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:29:49" (2/3) ... [2023-04-02 22:29:49,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55b966e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:29:49, skipping insertion in model container [2023-04-02 22:29:49,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:29:49" (3/3) ... [2023-04-02 22:29:49,943 INFO L112 eAbstractionObserver]: Analyzing ICFG prefixsum_iter.c [2023-04-02 22:29:49,959 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:29:49,960 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:29:50,016 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:29:50,023 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;@e262795, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:29:50,024 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:29:50,028 INFO L276 IsEmpty]: Start isEmpty. Operand has 49 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 22:29:50,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 22:29:50,038 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:29:50,039 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] [2023-04-02 22:29:50,040 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:29:50,046 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:29:50,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1649626328, now seen corresponding path program 1 times [2023-04-02 22:29:50,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:29:50,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122773780] [2023-04-02 22:29:50,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:29:50,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:29:50,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:29:50,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:29:50,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:29:50,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122773780] [2023-04-02 22:29:50,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122773780] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:29:50,743 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:29:50,743 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-02 22:29:50,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855917326] [2023-04-02 22:29:50,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:29:50,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-02 22:29:50,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:29:50,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-02 22:29:50,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:29:50,786 INFO L87 Difference]: Start difference. First operand has 49 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 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) [2023-04-02 22:29:50,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:29:50,902 INFO L93 Difference]: Finished difference Result 73 states and 89 transitions. [2023-04-02 22:29:50,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:29:50,904 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 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 42 [2023-04-02 22:29:50,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:29:50,910 INFO L225 Difference]: With dead ends: 73 [2023-04-02 22:29:50,910 INFO L226 Difference]: Without dead ends: 45 [2023-04-02 22:29:50,913 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 [2023-04-02 22:29:50,915 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:29:50,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 191 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:29:50,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-02 22:29:50,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-04-02 22:29:50,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 22:29:50,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2023-04-02 22:29:50,950 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 42 [2023-04-02 22:29:50,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:29:50,952 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2023-04-02 22:29:50,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 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) [2023-04-02 22:29:50,952 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2023-04-02 22:29:50,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 22:29:50,954 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:29:50,954 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] [2023-04-02 22:29:50,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:29:50,955 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:29:50,955 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:29:50,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1736324829, now seen corresponding path program 1 times [2023-04-02 22:29:50,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:29:50,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919294035] [2023-04-02 22:29:50,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:29:50,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:29:50,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:29:51,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:29:51,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:29:51,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919294035] [2023-04-02 22:29:51,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919294035] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:29:51,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764104488] [2023-04-02 22:29:51,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:29:51,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:29:51,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:29:51,849 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) [2023-04-02 22:29:51,854 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:29:51,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:29:51,967 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 54 conjunts are in the unsatisfiable core [2023-04-02 22:29:51,980 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:29:52,119 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 [2023-04-02 22:29:52,172 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 [2023-04-02 22:29:52,245 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-02 22:29:52,246 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 [2023-04-02 22:29:52,260 WARN L861 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_31 (Array Int Int))) (= (store |c_old(#memory_int)| |c_#Ultimate.meminit_#ptr.base| v_ArrVal_31) |c_#memory_int|)) is different from true [2023-04-02 22:29:52,266 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 13 treesize of output 15 [2023-04-02 22:29:52,280 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 13 treesize of output 15 [2023-04-02 22:29:52,319 WARN L861 $PredicateComparison]: unable to prove that (exists ((downsweep_~n Int) (downsweep_~a.offset Int)) (= (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (store (select |c_old(#memory_int)| |c_downsweep_#in~a.base|) (+ (* downsweep_~n 4) downsweep_~a.offset (- 4)) 0)) |c_#memory_int|)) is different from true [2023-04-02 22:29:52,326 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 0 case distinctions, treesize of input 23 treesize of output 18 [2023-04-02 22:29:52,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2023-04-02 22:29:52,470 WARN L839 $PredicateComparison]: unable to prove that (and (= c_check_~sum~0 0) (exists ((check_~i~0 Int) (v_arrayElimCell_6 (Array Int Int)) (check_~a.offset Int)) (and (= |c_check_#t~mem11| (select v_arrayElimCell_6 (+ (* check_~i~0 4) check_~a.offset))) (= (select v_arrayElimCell_6 (@diff v_arrayElimCell_6 ((as const (Array Int Int)) 0))) 0)))) is different from false [2023-04-02 22:29:52,472 WARN L861 $PredicateComparison]: unable to prove that (and (= c_check_~sum~0 0) (exists ((check_~i~0 Int) (v_arrayElimCell_6 (Array Int Int)) (check_~a.offset Int)) (and (= |c_check_#t~mem11| (select v_arrayElimCell_6 (+ (* check_~i~0 4) check_~a.offset))) (= (select v_arrayElimCell_6 (@diff v_arrayElimCell_6 ((as const (Array Int Int)) 0))) 0)))) is different from true [2023-04-02 22:29:52,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-04-02 22:29:52,547 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:30:41,440 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_32 (Array Int Int))) (= ((as const (Array Int Int)) 0) (select (store |c_#memory_int| c_main_~a0~0.base v_ArrVal_32) c_main_~a~0.base))) is different from false [2023-04-02 22:30:41,445 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_32 (Array Int Int))) (= ((as const (Array Int Int)) 0) (select (store |c_#memory_int| |c_main_#t~malloc16.base| v_ArrVal_32) c_main_~a~0.base))) is different from false [2023-04-02 22:30:41,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764104488] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:30:41,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451320714] [2023-04-02 22:30:41,478 INFO L159 IcfgInterpreter]: Started Sifa with 39 locations of interest [2023-04-02 22:30:41,478 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:30:41,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:30:41,483 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:30:41,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:30:41,538 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:30:42,311 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 27 for LOIs [2023-04-02 22:30:42,324 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 27 for LOIs [2023-04-02 22:30:42,357 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:30:42,375 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:30:42,377 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:30:42,382 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:30:42,413 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:30:42,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:30:42,425 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:30:44,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '464#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_1| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_1| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_1|) 0) 0)))) (= |#NULL.base| 0))' at error location [2023-04-02 22:30:44,951 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:30:44,951 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:30:44,951 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 20] total 27 [2023-04-02 22:30:44,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069100992] [2023-04-02 22:30:44,952 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:30:44,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 22:30:44,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:30:44,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 22:30:44,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=3508, Unknown=26, NotChecked=620, Total=4422 [2023-04-02 22:30:44,956 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 27 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 22 states have internal predecessors, (37), 8 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2023-04-02 22:30:45,649 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse1 ((as const (Array Int Int)) 0))) (and (= c_check_~sum~0 0) (= c_check_~sum~0 |c_check_#t~mem11|) (= |c_old(#memory_int)| |c_#memory_int|) (= (let ((.cse0 (select |c_#memory_int| |c_check_#in~a.base|))) (select .cse0 (@diff .cse0 .cse1))) 0) (exists ((|v_main_#t~malloc15.base_BEFORE_CALL_1| Int)) (= (select |c_#valid| |v_main_#t~malloc15.base_BEFORE_CALL_1|) 1)) (= (let ((.cse2 (select |c_#memory_int| c_check_~a.base))) (select .cse2 (@diff .cse2 .cse1))) 0) (exists ((check_~i~0 Int) (v_arrayElimCell_6 (Array Int Int)) (check_~a.offset Int)) (and (= |c_check_#t~mem11| (select v_arrayElimCell_6 (+ (* check_~i~0 4) check_~a.offset))) (= (select v_arrayElimCell_6 (@diff v_arrayElimCell_6 .cse1)) 0))))) is different from false [2023-04-02 22:30:45,652 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse1 ((as const (Array Int Int)) 0))) (and (= c_check_~sum~0 0) (= c_check_~sum~0 |c_check_#t~mem11|) (= |c_old(#memory_int)| |c_#memory_int|) (= (let ((.cse0 (select |c_#memory_int| |c_check_#in~a.base|))) (select .cse0 (@diff .cse0 .cse1))) 0) (exists ((|v_main_#t~malloc15.base_BEFORE_CALL_1| Int)) (= (select |c_#valid| |v_main_#t~malloc15.base_BEFORE_CALL_1|) 1)) (= (let ((.cse2 (select |c_#memory_int| c_check_~a.base))) (select .cse2 (@diff .cse2 .cse1))) 0) (exists ((check_~i~0 Int) (v_arrayElimCell_6 (Array Int Int)) (check_~a.offset Int)) (and (= |c_check_#t~mem11| (select v_arrayElimCell_6 (+ (* check_~i~0 4) check_~a.offset))) (= (select v_arrayElimCell_6 (@diff v_arrayElimCell_6 .cse1)) 0))))) is different from true [2023-04-02 22:30:45,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:30:45,806 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2023-04-02 22:30:45,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 22:30:45,814 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 22 states have internal predecessors, (37), 8 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 43 [2023-04-02 22:30:45,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:30:45,817 INFO L225 Difference]: With dead ends: 76 [2023-04-02 22:30:45,817 INFO L226 Difference]: Without dead ends: 74 [2023-04-02 22:30:45,820 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 82 ConstructedPredicates, 6 IntricatePredicates, 0 DeprecatedPredicates, 1810 ImplicationChecksByTransitivity, 52.0s TimeCoverageRelationStatistics Valid=430, Invalid=5572, Unknown=28, NotChecked=942, Total=6972 [2023-04-02 22:30:45,821 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 119 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 767 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 767 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 307 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:30:45,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 137 Invalid, 1145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 767 Invalid, 0 Unknown, 307 Unchecked, 0.5s Time] [2023-04-02 22:30:45,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-04-02 22:30:45,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 61. [2023-04-02 22:30:45,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 38 states have internal predecessors, (47), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2023-04-02 22:30:45,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2023-04-02 22:30:45,833 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 43 [2023-04-02 22:30:45,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:30:45,834 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2023-04-02 22:30:45,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 22 states have internal predecessors, (37), 8 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2023-04-02 22:30:45,834 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2023-04-02 22:30:45,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 22:30:45,835 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:30:45,835 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, 1] [2023-04-02 22:30:45,845 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:30:46,040 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 [2023-04-02 22:30:46,041 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:30:46,041 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:30:46,041 INFO L85 PathProgramCache]: Analyzing trace with hash -83992848, now seen corresponding path program 1 times [2023-04-02 22:30:46,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:30:46,041 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071928023] [2023-04-02 22:30:46,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:46,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:30:46,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:46,222 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:46,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:30:46,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071928023] [2023-04-02 22:30:46,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071928023] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:30:46,223 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:30:46,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-04-02 22:30:46,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302638459] [2023-04-02 22:30:46,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:30:46,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:30:46,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:30:46,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:30:46,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-04-02 22:30:46,224 INFO L87 Difference]: Start difference. First operand 61 states and 75 transitions. Second operand has 8 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:30:46,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:30:46,317 INFO L93 Difference]: Finished difference Result 89 states and 111 transitions. [2023-04-02 22:30:46,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:30:46,317 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 46 [2023-04-02 22:30:46,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:30:46,319 INFO L225 Difference]: With dead ends: 89 [2023-04-02 22:30:46,319 INFO L226 Difference]: Without dead ends: 70 [2023-04-02 22:30:46,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-04-02 22:30:46,320 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 4 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:30:46,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 245 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:30:46,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-04-02 22:30:46,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 67. [2023-04-02 22:30:46,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 43 states have internal predecessors, (52), 15 states have call successors, (15), 11 states have call predecessors, (15), 12 states have return successors, (18), 12 states have call predecessors, (18), 12 states have call successors, (18) [2023-04-02 22:30:46,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2023-04-02 22:30:46,338 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 46 [2023-04-02 22:30:46,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:30:46,338 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2023-04-02 22:30:46,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:30:46,339 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2023-04-02 22:30:46,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 22:30:46,340 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:30:46,340 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, 1] [2023-04-02 22:30:46,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 22:30:46,340 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:30:46,340 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:30:46,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1779461702, now seen corresponding path program 1 times [2023-04-02 22:30:46,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:30:46,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599558483] [2023-04-02 22:30:46,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:46,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:30:46,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:46,528 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:46,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:30:46,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599558483] [2023-04-02 22:30:46,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599558483] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:30:46,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694714081] [2023-04-02 22:30:46,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:46,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:46,530 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:30:46,533 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) [2023-04-02 22:30:46,538 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:30:46,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:46,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:30:46,617 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:30:46,699 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-02 22:30:46,700 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:30:46,813 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-02 22:30:46,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694714081] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:30:46,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024220094] [2023-04-02 22:30:46,816 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-04-02 22:30:46,816 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:30:46,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:30:46,817 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:30:46,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:30:46,833 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:30:47,283 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:30:47,293 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:30:47,314 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:30:47,324 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:30:47,329 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:30:47,332 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:30:47,581 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:30:47,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:30:47,589 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:30:49,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1299#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_2| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_2|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_2| 1) |#StackHeapBarrier|))) (= |#NULL.base| 0))' at error location [2023-04-02 22:30:49,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:30:49,861 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:30:49,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 15 [2023-04-02 22:30:49,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042298425] [2023-04-02 22:30:49,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:30:49,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:30:49,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:30:49,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:30:49,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=2263, Unknown=8, NotChecked=0, Total=2450 [2023-04-02 22:30:49,864 INFO L87 Difference]: Start difference. First operand 67 states and 85 transitions. Second operand has 15 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 14 states have internal predecessors, (40), 4 states have call successors, (14), 2 states have call predecessors, (14), 5 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-04-02 22:30:50,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:30:50,193 INFO L93 Difference]: Finished difference Result 109 states and 144 transitions. [2023-04-02 22:30:50,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:30:50,194 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 14 states have internal predecessors, (40), 4 states have call successors, (14), 2 states have call predecessors, (14), 5 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 46 [2023-04-02 22:30:50,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:30:50,198 INFO L225 Difference]: With dead ends: 109 [2023-04-02 22:30:50,198 INFO L226 Difference]: Without dead ends: 77 [2023-04-02 22:30:50,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 93 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=214, Invalid=2858, Unknown=8, NotChecked=0, Total=3080 [2023-04-02 22:30:50,200 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 16 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:30:50,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 458 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:30:50,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-04-02 22:30:50,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 69. [2023-04-02 22:30:50,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 40 states have (on average 1.35) internal successors, (54), 45 states have internal predecessors, (54), 16 states have call successors, (16), 11 states have call predecessors, (16), 12 states have return successors, (17), 12 states have call predecessors, (17), 13 states have call successors, (17) [2023-04-02 22:30:50,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 87 transitions. [2023-04-02 22:30:50,212 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 87 transitions. Word has length 46 [2023-04-02 22:30:50,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:30:50,212 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 87 transitions. [2023-04-02 22:30:50,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 14 states have internal predecessors, (40), 4 states have call successors, (14), 2 states have call predecessors, (14), 5 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-04-02 22:30:50,213 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 87 transitions. [2023-04-02 22:30:50,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-04-02 22:30:50,214 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:30:50,214 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, 1, 1, 1] [2023-04-02 22:30:50,220 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 22:30:50,416 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,SelfDestructingSolverStorable3 [2023-04-02 22:30:50,417 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:30:50,417 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:30:50,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1497386905, now seen corresponding path program 1 times [2023-04-02 22:30:50,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:30:50,417 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724242419] [2023-04-02 22:30:50,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:50,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:30:50,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:50,595 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:50,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:30:50,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724242419] [2023-04-02 22:30:50,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724242419] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:30:50,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107651609] [2023-04-02 22:30:50,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:50,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:50,600 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:30:50,601 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) [2023-04-02 22:30:50,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:30:50,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:50,694 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:30:50,696 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:30:50,755 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:50,755 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:30:50,945 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:50,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107651609] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:30:50,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052777601] [2023-04-02 22:30:50,948 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:30:50,948 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:30:50,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:30:50,949 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:30:50,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:30:50,963 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:30:51,418 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:30:51,537 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:30:51,558 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:30:51,566 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:30:51,568 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:30:51,590 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:30:51,807 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:30:51,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:30:51,819 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:30:54,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1942#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_3| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_3|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_3| 1) |#StackHeapBarrier|))) (= |#NULL.base| 0))' at error location [2023-04-02 22:30:54,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:30:54,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:30:54,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 15 [2023-04-02 22:30:54,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627485000] [2023-04-02 22:30:54,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:30:54,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:30:54,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:30:54,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:30:54,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=2341, Unknown=7, NotChecked=0, Total=2550 [2023-04-02 22:30:54,073 INFO L87 Difference]: Start difference. First operand 69 states and 87 transitions. Second operand has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:30:54,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:30:54,273 INFO L93 Difference]: Finished difference Result 97 states and 122 transitions. [2023-04-02 22:30:54,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 22:30:54,273 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 49 [2023-04-02 22:30:54,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:30:54,274 INFO L225 Difference]: With dead ends: 97 [2023-04-02 22:30:54,274 INFO L226 Difference]: Without dead ends: 76 [2023-04-02 22:30:54,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 100 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=245, Invalid=2828, Unknown=7, NotChecked=0, Total=3080 [2023-04-02 22:30:54,276 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 22 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:30:54,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 330 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:30:54,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-02 22:30:54,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2023-04-02 22:30:54,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 40 states have internal predecessors, (48), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-02 22:30:54,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2023-04-02 22:30:54,286 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 49 [2023-04-02 22:30:54,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:30:54,286 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2023-04-02 22:30:54,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:30:54,287 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2023-04-02 22:30:54,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-04-02 22:30:54,288 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:30:54,288 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, 1, 1, 1] [2023-04-02 22:30:54,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:30:54,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:54,495 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:30:54,496 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:30:54,496 INFO L85 PathProgramCache]: Analyzing trace with hash -2053597279, now seen corresponding path program 1 times [2023-04-02 22:30:54,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:30:54,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024052539] [2023-04-02 22:30:54,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:54,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:30:54,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:54,633 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:54,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:30:54,633 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024052539] [2023-04-02 22:30:54,633 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024052539] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:30:54,633 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513427538] [2023-04-02 22:30:54,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:54,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:54,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:30:54,635 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) [2023-04-02 22:30:54,638 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:30:54,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:54,725 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 22:30:54,732 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:30:54,779 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:54,779 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:30:54,897 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:30:54,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [513427538] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:30:54,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051811416] [2023-04-02 22:30:54,899 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:30:54,899 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:30:54,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:30:54,900 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:30:54,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:30:54,914 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:30:55,358 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 27 for LOIs [2023-04-02 22:30:55,375 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 27 for LOIs [2023-04-02 22:30:55,405 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:30:55,414 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:30:55,416 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:30:55,419 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:30:55,435 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:30:55,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:30:55,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:30:57,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2554#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_4| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_4| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_4|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:30:57,273 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:30:57,273 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:30:57,273 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-02 22:30:57,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265381494] [2023-04-02 22:30:57,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:30:57,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:30:57,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:30:57,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:30:57,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2143, Unknown=4, NotChecked=0, Total=2352 [2023-04-02 22:30:57,275 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 15 states, 15 states have (on average 3.0) internal successors, (45), 15 states have internal predecessors, (45), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 4 states have call successors, (10) [2023-04-02 22:30:57,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:30:57,464 INFO L93 Difference]: Finished difference Result 95 states and 118 transitions. [2023-04-02 22:30:57,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 22:30:57,464 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 15 states have internal predecessors, (45), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 4 states have call successors, (10) Word has length 49 [2023-04-02 22:30:57,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:30:57,465 INFO L225 Difference]: With dead ends: 95 [2023-04-02 22:30:57,465 INFO L226 Difference]: Without dead ends: 69 [2023-04-02 22:30:57,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 103 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=243, Invalid=2615, Unknown=4, NotChecked=0, Total=2862 [2023-04-02 22:30:57,467 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 22 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:30:57,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 276 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:30:57,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-04-02 22:30:57,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 64. [2023-04-02 22:30:57,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 41 states have internal predecessors, (49), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-02 22:30:57,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2023-04-02 22:30:57,482 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 49 [2023-04-02 22:30:57,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:30:57,482 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2023-04-02 22:30:57,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 15 states have internal predecessors, (45), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 4 states have call successors, (10) [2023-04-02 22:30:57,482 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2023-04-02 22:30:57,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 22:30:57,484 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:30:57,484 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-04-02 22:30:57,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:30:57,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:57,690 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:30:57,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:30:57,690 INFO L85 PathProgramCache]: Analyzing trace with hash 555188936, now seen corresponding path program 1 times [2023-04-02 22:30:57,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:30:57,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889395133] [2023-04-02 22:30:57,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:57,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:30:57,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:30:57,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:30:57,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889395133] [2023-04-02 22:30:57,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889395133] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:30:57,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950098373] [2023-04-02 22:30:57,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:30:57,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:30:57,811 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:30:57,812 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) [2023-04-02 22:30:57,814 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:30:57,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:30:57,890 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 22:30:57,892 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:30:57,934 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:30:57,935 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:30:57,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:30:57,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950098373] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:30:57,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730406262] [2023-04-02 22:30:57,992 INFO L159 IcfgInterpreter]: Started Sifa with 42 locations of interest [2023-04-02 22:30:57,992 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:30:57,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:30:57,993 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:30:57,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:30:58,020 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:30:58,347 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 27 for LOIs [2023-04-02 22:30:58,355 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 27 for LOIs [2023-04-02 22:30:58,570 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-02 22:30:58,588 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:30:58,590 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:30:58,593 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:30:58,598 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:30:58,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:30:58,609 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:00,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3167#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:00,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:00,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:00,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2023-04-02 22:31:00,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514206381] [2023-04-02 22:31:00,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:00,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:31:00,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:00,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:31:00,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1965, Unknown=1, NotChecked=0, Total=2162 [2023-04-02 22:31:00,442 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-04-02 22:31:00,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:00,542 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2023-04-02 22:31:00,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:31:00,549 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 50 [2023-04-02 22:31:00,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:00,553 INFO L225 Difference]: With dead ends: 81 [2023-04-02 22:31:00,553 INFO L226 Difference]: Without dead ends: 63 [2023-04-02 22:31:00,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 106 SyntacticMatches, 6 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=217, Invalid=2232, Unknown=1, NotChecked=0, Total=2450 [2023-04-02 22:31:00,558 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 5 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:00,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 287 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:00,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-04-02 22:31:00,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-04-02 22:31:00,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 38 states have (on average 1.263157894736842) internal successors, (48), 40 states have internal predecessors, (48), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2023-04-02 22:31:00,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2023-04-02 22:31:00,580 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 50 [2023-04-02 22:31:00,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:00,580 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2023-04-02 22:31:00,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-04-02 22:31:00,581 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2023-04-02 22:31:00,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-02 22:31:00,583 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:00,583 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] [2023-04-02 22:31:00,592 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:00,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:00,790 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:00,790 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:00,790 INFO L85 PathProgramCache]: Analyzing trace with hash -552172525, now seen corresponding path program 2 times [2023-04-02 22:31:00,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:00,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253147182] [2023-04-02 22:31:00,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:00,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:00,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:00,898 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:31:00,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:00,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253147182] [2023-04-02 22:31:00,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253147182] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:00,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889291962] [2023-04-02 22:31:00,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:31:00,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:00,899 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:00,900 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) [2023-04-02 22:31:00,902 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:31:00,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:31:00,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:00,982 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 22:31:00,983 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:01,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 22:31:01,045 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:31:01,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889291962] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:31:01,045 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:31:01,045 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [7] total 12 [2023-04-02 22:31:01,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85815235] [2023-04-02 22:31:01,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:31:01,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:31:01,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:01,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:31:01,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2023-04-02 22:31:01,046 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:01,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:01,157 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2023-04-02 22:31:01,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:31:01,157 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 51 [2023-04-02 22:31:01,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:01,159 INFO L225 Difference]: With dead ends: 76 [2023-04-02 22:31:01,159 INFO L226 Difference]: Without dead ends: 53 [2023-04-02 22:31:01,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2023-04-02 22:31:01,161 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 6 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:01,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 229 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:01,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-04-02 22:31:01,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2023-04-02 22:31:01,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 22:31:01,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2023-04-02 22:31:01,175 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 51 [2023-04-02 22:31:01,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:01,175 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2023-04-02 22:31:01,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:01,175 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2023-04-02 22:31:01,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 22:31:01,176 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:01,177 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, 1, 1, 1, 1] [2023-04-02 22:31:01,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:01,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:01,383 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:01,383 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:01,383 INFO L85 PathProgramCache]: Analyzing trace with hash -58217406, now seen corresponding path program 1 times [2023-04-02 22:31:01,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:01,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213055737] [2023-04-02 22:31:01,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:01,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:01,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:31:03,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:03,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213055737] [2023-04-02 22:31:03,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213055737] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:03,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967219523] [2023-04-02 22:31:03,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:03,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:03,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:03,741 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) [2023-04-02 22:31:03,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:31:03,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:03,834 INFO L262 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 81 conjunts are in the unsatisfiable core [2023-04-02 22:31:03,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:04,304 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 [2023-04-02 22:31:04,524 INFO L321 Elim1Store]: treesize reduction 72, result has 41.9 percent of original size [2023-04-02 22:31:04,525 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 52 treesize of output 69 [2023-04-02 22:31:04,945 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:31:04,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:05,187 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 22:31:05,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 167 treesize of output 174 [2023-04-02 22:31:05,200 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 22:31:05,200 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 22:31:05,303 INFO L321 Elim1Store]: treesize reduction 147, result has 54.1 percent of original size [2023-04-02 22:31:05,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 10 case distinctions, treesize of input 168 treesize of output 374 [2023-04-02 22:31:05,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 994 treesize of output 922 [2023-04-02 22:31:05,619 INFO L321 Elim1Store]: treesize reduction 40, result has 54.0 percent of original size [2023-04-02 22:31:05,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 58583 treesize of output 43443 [2023-04-02 22:31:06,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 44 [2023-04-02 22:31:06,354 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 22:31:06,354 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 80 treesize of output 1 [2023-04-02 22:31:06,811 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-02 22:31:06,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967219523] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:06,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199855055] [2023-04-02 22:31:06,813 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:06,813 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:06,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:06,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:06,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:06,829 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:07,216 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:07,359 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:07,378 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:07,385 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:07,387 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:07,389 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:07,579 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:07,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:07,588 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:11,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4170#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_12| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_12| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_12|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:11,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:11,474 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:11,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 23, 20] total 58 [2023-04-02 22:31:11,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952994650] [2023-04-02 22:31:11,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:11,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-04-02 22:31:11,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:11,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-04-02 22:31:11,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=8392, Unknown=1, NotChecked=0, Total=8742 [2023-04-02 22:31:11,477 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 58 states, 43 states have (on average 1.627906976744186) internal successors, (70), 48 states have internal predecessors, (70), 13 states have call successors, (19), 6 states have call predecessors, (19), 11 states have return successors, (16), 9 states have call predecessors, (16), 9 states have call successors, (16) [2023-04-02 22:31:19,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:19,506 INFO L93 Difference]: Finished difference Result 122 states and 174 transitions. [2023-04-02 22:31:19,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2023-04-02 22:31:19,506 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 43 states have (on average 1.627906976744186) internal successors, (70), 48 states have internal predecessors, (70), 13 states have call successors, (19), 6 states have call predecessors, (19), 11 states have return successors, (16), 9 states have call predecessors, (16), 9 states have call successors, (16) Word has length 50 [2023-04-02 22:31:19,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:19,511 INFO L225 Difference]: With dead ends: 122 [2023-04-02 22:31:19,511 INFO L226 Difference]: Without dead ends: 120 [2023-04-02 22:31:19,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 84 SyntacticMatches, 4 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6011 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=945, Invalid=21106, Unknown=1, NotChecked=0, Total=22052 [2023-04-02 22:31:19,518 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 192 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 2061 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 2234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 2061 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:19,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 229 Invalid, 2234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 2061 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-02 22:31:19,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-04-02 22:31:19,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 82. [2023-04-02 22:31:19,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 53 states have (on average 1.3773584905660377) internal successors, (73), 58 states have internal predecessors, (73), 16 states have call successors, (16), 11 states have call predecessors, (16), 12 states have return successors, (23), 12 states have call predecessors, (23), 13 states have call successors, (23) [2023-04-02 22:31:19,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 112 transitions. [2023-04-02 22:31:19,553 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 112 transitions. Word has length 50 [2023-04-02 22:31:19,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:19,553 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 112 transitions. [2023-04-02 22:31:19,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 43 states have (on average 1.627906976744186) internal successors, (70), 48 states have internal predecessors, (70), 13 states have call successors, (19), 6 states have call predecessors, (19), 11 states have return successors, (16), 9 states have call predecessors, (16), 9 states have call successors, (16) [2023-04-02 22:31:19,553 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 112 transitions. [2023-04-02 22:31:19,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-02 22:31:19,555 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:19,555 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-04-02 22:31:19,564 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:19,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:19,764 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:19,765 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:19,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1165578867, now seen corresponding path program 2 times [2023-04-02 22:31:19,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:19,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963924801] [2023-04-02 22:31:19,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:19,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:19,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:19,894 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 22:31:19,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:19,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963924801] [2023-04-02 22:31:19,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963924801] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:19,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398363681] [2023-04-02 22:31:19,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:31:19,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:19,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:19,896 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:19,901 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:31:19,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:31:19,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:19,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 22:31:19,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:31:20,187 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:31:20,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398363681] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:20,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140470908] [2023-04-02 22:31:20,461 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:20,461 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:20,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:20,461 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:20,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:20,474 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:20,871 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:21,003 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:21,020 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:21,027 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:21,029 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:21,032 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:21,208 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:21,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:21,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:23,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4991#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_13| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_13|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_13| 1) |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:23,675 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:23,675 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:23,675 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 25 [2023-04-02 22:31:23,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952777785] [2023-04-02 22:31:23,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:23,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 22:31:23,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:23,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 22:31:23,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=3424, Unknown=4, NotChecked=0, Total=3660 [2023-04-02 22:31:23,677 INFO L87 Difference]: Start difference. First operand 82 states and 112 transitions. Second operand has 25 states, 20 states have (on average 3.1) internal successors, (62), 25 states have internal predecessors, (62), 7 states have call successors, (20), 2 states have call predecessors, (20), 7 states have return successors, (19), 6 states have call predecessors, (19), 7 states have call successors, (19) [2023-04-02 22:31:24,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:24,112 INFO L93 Difference]: Finished difference Result 147 states and 212 transitions. [2023-04-02 22:31:24,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 22:31:24,113 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 20 states have (on average 3.1) internal successors, (62), 25 states have internal predecessors, (62), 7 states have call successors, (20), 2 states have call predecessors, (20), 7 states have return successors, (19), 6 states have call predecessors, (19), 7 states have call successors, (19) Word has length 51 [2023-04-02 22:31:24,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:24,114 INFO L225 Difference]: With dead ends: 147 [2023-04-02 22:31:24,114 INFO L226 Difference]: Without dead ends: 105 [2023-04-02 22:31:24,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=283, Invalid=4269, Unknown=4, NotChecked=0, Total=4556 [2023-04-02 22:31:24,115 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 14 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:24,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 550 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:31:24,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-04-02 22:31:24,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 93. [2023-04-02 22:31:24,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 60 states have (on average 1.35) internal successors, (81), 65 states have internal predecessors, (81), 19 states have call successors, (19), 11 states have call predecessors, (19), 13 states have return successors, (25), 16 states have call predecessors, (25), 16 states have call successors, (25) [2023-04-02 22:31:24,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 125 transitions. [2023-04-02 22:31:24,137 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 125 transitions. Word has length 51 [2023-04-02 22:31:24,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:24,137 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 125 transitions. [2023-04-02 22:31:24,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 20 states have (on average 3.1) internal successors, (62), 25 states have internal predecessors, (62), 7 states have call successors, (20), 2 states have call predecessors, (20), 7 states have return successors, (19), 6 states have call predecessors, (19), 7 states have call successors, (19) [2023-04-02 22:31:24,137 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 125 transitions. [2023-04-02 22:31:24,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-02 22:31:24,138 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:24,138 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-04-02 22:31:24,145 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:24,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 22:31:24,344 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:24,344 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:24,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1336834758, now seen corresponding path program 1 times [2023-04-02 22:31:24,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:24,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159829822] [2023-04-02 22:31:24,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:24,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:24,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:24,498 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 22:31:24,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:24,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159829822] [2023-04-02 22:31:24,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159829822] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:24,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188650407] [2023-04-02 22:31:24,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:24,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:24,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:24,501 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:24,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:31:24,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:24,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:31:24,606 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:24,667 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:24,667 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:24,804 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:24,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188650407] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:24,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902970835] [2023-04-02 22:31:24,806 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:24,806 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:24,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:24,806 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:24,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:24,825 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:25,198 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:25,339 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:25,358 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:25,366 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:25,368 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:25,370 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:25,549 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:25,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:25,565 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:27,783 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5777#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_14| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_14|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_14| 1) |#StackHeapBarrier|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:27,783 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:27,783 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:27,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 20 [2023-04-02 22:31:27,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933426633] [2023-04-02 22:31:27,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:27,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 22:31:27,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:27,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 22:31:27,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2647, Unknown=5, NotChecked=0, Total=2862 [2023-04-02 22:31:27,785 INFO L87 Difference]: Start difference. First operand 93 states and 125 transitions. Second operand has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2023-04-02 22:31:28,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:28,336 INFO L93 Difference]: Finished difference Result 138 states and 206 transitions. [2023-04-02 22:31:28,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 22:31:28,337 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) Word has length 53 [2023-04-02 22:31:28,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:28,338 INFO L225 Difference]: With dead ends: 138 [2023-04-02 22:31:28,338 INFO L226 Difference]: Without dead ends: 119 [2023-04-02 22:31:28,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 109 SyntacticMatches, 8 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1461 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=419, Invalid=4406, Unknown=5, NotChecked=0, Total=4830 [2023-04-02 22:31:28,339 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 20 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:28,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 371 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:31:28,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-04-02 22:31:28,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 102. [2023-04-02 22:31:28,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 66 states have (on average 1.378787878787879) internal successors, (91), 73 states have internal predecessors, (91), 21 states have call successors, (21), 11 states have call predecessors, (21), 14 states have return successors, (30), 17 states have call predecessors, (30), 18 states have call successors, (30) [2023-04-02 22:31:28,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 142 transitions. [2023-04-02 22:31:28,374 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 142 transitions. Word has length 53 [2023-04-02 22:31:28,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:28,375 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 142 transitions. [2023-04-02 22:31:28,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2023-04-02 22:31:28,375 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 142 transitions. [2023-04-02 22:31:28,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-02 22:31:28,376 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:28,376 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] [2023-04-02 22:31:28,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:28,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:28,578 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:28,579 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:28,579 INFO L85 PathProgramCache]: Analyzing trace with hash 717118555, now seen corresponding path program 3 times [2023-04-02 22:31:28,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:28,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421333504] [2023-04-02 22:31:28,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:28,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:28,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:28,724 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:28,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:28,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421333504] [2023-04-02 22:31:28,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421333504] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:28,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155238091] [2023-04-02 22:31:28,725 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:31:28,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:28,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:28,726 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:28,731 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 22:31:28,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:31:28,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:28,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 22:31:28,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:28,882 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:28,882 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:28,991 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:28,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155238091] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:28,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337618355] [2023-04-02 22:31:28,993 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:28,994 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:28,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:28,994 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:28,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:29,005 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:29,386 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:29,510 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:29,526 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:29,533 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:29,535 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:29,537 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:29,708 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:29,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:29,714 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:31,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6574#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_check_#in~a.base_BEFORE_CALL_15| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_15| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_15|) 0) 0)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:31,795 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:31,795 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:31,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 15 [2023-04-02 22:31:31,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026925233] [2023-04-02 22:31:31,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:31,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:31:31,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:31,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:31:31,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2348, Unknown=3, NotChecked=0, Total=2550 [2023-04-02 22:31:31,797 INFO L87 Difference]: Start difference. First operand 102 states and 142 transitions. Second operand has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:31,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:31,923 INFO L93 Difference]: Finished difference Result 138 states and 190 transitions. [2023-04-02 22:31:31,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:31:31,923 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 53 [2023-04-02 22:31:31,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:31,924 INFO L225 Difference]: With dead ends: 138 [2023-04-02 22:31:31,924 INFO L226 Difference]: Without dead ends: 103 [2023-04-02 22:31:31,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 112 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=212, Invalid=2541, Unknown=3, NotChecked=0, Total=2756 [2023-04-02 22:31:31,925 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 10 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:31,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 307 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:31,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-04-02 22:31:31,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2023-04-02 22:31:31,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 66 states have (on average 1.3636363636363635) internal successors, (90), 73 states have internal predecessors, (90), 21 states have call successors, (21), 11 states have call predecessors, (21), 14 states have return successors, (29), 17 states have call predecessors, (29), 18 states have call successors, (29) [2023-04-02 22:31:31,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 140 transitions. [2023-04-02 22:31:31,952 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 140 transitions. Word has length 53 [2023-04-02 22:31:31,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:31,952 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 140 transitions. [2023-04-02 22:31:31,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:31,952 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 140 transitions. [2023-04-02 22:31:31,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:31:31,953 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:31,953 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, 1] [2023-04-02 22:31:31,958 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:32,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 22:31:32,154 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:32,154 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:32,154 INFO L85 PathProgramCache]: Analyzing trace with hash 935842145, now seen corresponding path program 2 times [2023-04-02 22:31:32,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:32,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948831772] [2023-04-02 22:31:32,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:32,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:32,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:32,317 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-02 22:31:32,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:32,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948831772] [2023-04-02 22:31:32,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948831772] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:32,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768875811] [2023-04-02 22:31:32,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:31:32,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:32,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:32,319 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:32,322 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 22:31:32,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:31:32,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:32,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 22:31:32,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:32,500 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:31:32,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:32,570 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:31:32,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768875811] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:32,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563340107] [2023-04-02 22:31:32,571 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:32,571 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:32,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:32,572 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:32,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:32,584 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:32,931 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:33,026 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:33,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:33,045 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:33,046 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:33,048 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:33,213 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:33,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:33,226 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:35,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7358#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_16| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_16| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_16|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:35,377 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:35,377 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:35,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 20 [2023-04-02 22:31:35,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597416766] [2023-04-02 22:31:35,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:35,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 22:31:35,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:35,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 22:31:35,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2658, Unknown=5, NotChecked=0, Total=2862 [2023-04-02 22:31:35,378 INFO L87 Difference]: Start difference. First operand 102 states and 140 transitions. Second operand has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 20 states have internal predecessors, (50), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-04-02 22:31:35,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:35,844 INFO L93 Difference]: Finished difference Result 160 states and 223 transitions. [2023-04-02 22:31:35,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 22:31:35,845 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 20 states have internal predecessors, (50), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 54 [2023-04-02 22:31:35,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:35,847 INFO L225 Difference]: With dead ends: 160 [2023-04-02 22:31:35,847 INFO L226 Difference]: Without dead ends: 112 [2023-04-02 22:31:35,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 115 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1506 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=381, Invalid=4306, Unknown=5, NotChecked=0, Total=4692 [2023-04-02 22:31:35,848 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 18 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:35,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 382 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:31:35,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-02 22:31:35,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 94. [2023-04-02 22:31:35,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 61 states have (on average 1.3278688524590163) internal successors, (81), 66 states have internal predecessors, (81), 20 states have call successors, (20), 11 states have call predecessors, (20), 12 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) [2023-04-02 22:31:35,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 123 transitions. [2023-04-02 22:31:35,871 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 123 transitions. Word has length 54 [2023-04-02 22:31:35,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:35,872 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 123 transitions. [2023-04-02 22:31:35,872 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 20 states have internal predecessors, (50), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-04-02 22:31:35,872 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 123 transitions. [2023-04-02 22:31:35,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:31:35,874 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:35,875 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, 1] [2023-04-02 22:31:35,882 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:36,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 22:31:36,080 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:36,081 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:36,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1389482919, now seen corresponding path program 3 times [2023-04-02 22:31:36,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:36,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313411489] [2023-04-02 22:31:36,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:36,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:36,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:36,273 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:36,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:36,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313411489] [2023-04-02 22:31:36,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313411489] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:36,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037657145] [2023-04-02 22:31:36,274 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:31:36,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:36,274 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:36,277 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:36,305 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 22:31:36,377 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:31:36,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:36,379 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-02 22:31:36,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:36,457 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:36,457 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:36,686 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:36,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037657145] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:36,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127169489] [2023-04-02 22:31:36,688 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:36,688 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:36,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:36,688 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:36,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:36,702 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:37,067 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:37,192 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:37,209 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:37,215 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:37,217 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:37,219 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:37,405 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:37,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:37,418 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:39,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8195#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_17| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_17|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_17| 1) |#StackHeapBarrier|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:39,563 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:39,563 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:39,563 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 23 [2023-04-02 22:31:39,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742073147] [2023-04-02 22:31:39,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:39,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 22:31:39,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:39,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 22:31:39,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=2941, Unknown=3, NotChecked=0, Total=3192 [2023-04-02 22:31:39,565 INFO L87 Difference]: Start difference. First operand 94 states and 123 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-04-02 22:31:39,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:39,822 INFO L93 Difference]: Finished difference Result 110 states and 141 transitions. [2023-04-02 22:31:39,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 22:31:39,823 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 54 [2023-04-02 22:31:39,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:39,823 INFO L225 Difference]: With dead ends: 110 [2023-04-02 22:31:39,823 INFO L226 Difference]: Without dead ends: 99 [2023-04-02 22:31:39,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 110 SyntacticMatches, 8 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1458 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=327, Invalid=3702, Unknown=3, NotChecked=0, Total=4032 [2023-04-02 22:31:39,824 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 18 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:39,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 380 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:39,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-04-02 22:31:39,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 89. [2023-04-02 22:31:39,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 57 states have (on average 1.2982456140350878) internal successors, (74), 61 states have internal predecessors, (74), 20 states have call successors, (20), 11 states have call predecessors, (20), 11 states have return successors, (19), 16 states have call predecessors, (19), 17 states have call successors, (19) [2023-04-02 22:31:39,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 113 transitions. [2023-04-02 22:31:39,843 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 113 transitions. Word has length 54 [2023-04-02 22:31:39,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:39,843 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 113 transitions. [2023-04-02 22:31:39,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-04-02 22:31:39,843 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 113 transitions. [2023-04-02 22:31:39,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:31:39,844 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:39,844 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] [2023-04-02 22:31:39,849 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:40,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 22:31:40,047 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:40,048 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:40,048 INFO L85 PathProgramCache]: Analyzing trace with hash 955634480, now seen corresponding path program 4 times [2023-04-02 22:31:40,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:40,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116959350] [2023-04-02 22:31:40,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:40,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:40,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:40,199 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:40,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:40,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116959350] [2023-04-02 22:31:40,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116959350] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:40,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714138482] [2023-04-02 22:31:40,200 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:31:40,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:40,200 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:40,201 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:40,203 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 22:31:40,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:40,304 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:31:40,305 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:40,372 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:40,373 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:40,510 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:31:40,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714138482] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:40,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29271386] [2023-04-02 22:31:40,512 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:40,512 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:40,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:40,513 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:40,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:40,526 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:40,885 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:41,009 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:41,038 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:41,045 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:41,047 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:41,050 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:41,210 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:41,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:41,217 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:43,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8913#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_18| Int)) (and (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_18|) 0) 0)) (<= (+ |v_check_#in~a.base_BEFORE_CALL_18| 1) |#StackHeapBarrier|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:43,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:43,369 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:43,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 17 [2023-04-02 22:31:43,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755090940] [2023-04-02 22:31:43,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:43,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:31:43,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:43,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:31:43,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2546, Unknown=1, NotChecked=0, Total=2756 [2023-04-02 22:31:43,370 INFO L87 Difference]: Start difference. First operand 89 states and 113 transitions. Second operand has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:43,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:43,562 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2023-04-02 22:31:43,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 22:31:43,562 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 54 [2023-04-02 22:31:43,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:43,564 INFO L225 Difference]: With dead ends: 122 [2023-04-02 22:31:43,564 INFO L226 Difference]: Without dead ends: 90 [2023-04-02 22:31:43,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 113 SyntacticMatches, 7 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=231, Invalid=2848, Unknown=1, NotChecked=0, Total=3080 [2023-04-02 22:31:43,566 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:43,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 343 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:43,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-04-02 22:31:43,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2023-04-02 22:31:43,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 57 states have (on average 1.280701754385965) internal successors, (73), 61 states have internal predecessors, (73), 20 states have call successors, (20), 11 states have call predecessors, (20), 11 states have return successors, (19), 16 states have call predecessors, (19), 17 states have call successors, (19) [2023-04-02 22:31:43,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 112 transitions. [2023-04-02 22:31:43,590 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 112 transitions. Word has length 54 [2023-04-02 22:31:43,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:43,592 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 112 transitions. [2023-04-02 22:31:43,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:31:43,592 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 112 transitions. [2023-04-02 22:31:43,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-02 22:31:43,593 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:43,593 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] [2023-04-02 22:31:43,645 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:43,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 22:31:43,798 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:43,798 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:43,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1838652487, now seen corresponding path program 5 times [2023-04-02 22:31:43,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:43,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586005595] [2023-04-02 22:31:43,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:43,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:43,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:43,991 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:31:43,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:43,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586005595] [2023-04-02 22:31:43,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586005595] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:43,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344970404] [2023-04-02 22:31:43,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:31:43,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:43,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:43,993 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:44,017 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 22:31:44,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:31:44,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:31:44,160 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 19 conjunts are in the unsatisfiable core [2023-04-02 22:31:44,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:44,371 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 22:31:44,372 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:44,599 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 22:31:44,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344970404] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:44,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:31:44,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [11, 10] total 25 [2023-04-02 22:31:44,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468307329] [2023-04-02 22:31:44,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:31:44,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 22:31:44,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:44,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 22:31:44,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=537, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:31:44,600 INFO L87 Difference]: Start difference. First operand 89 states and 112 transitions. Second operand has 10 states, 7 states have (on average 4.285714285714286) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-04-02 22:31:44,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:44,788 INFO L93 Difference]: Finished difference Result 119 states and 153 transitions. [2023-04-02 22:31:44,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:31:44,789 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 4.285714285714286) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 55 [2023-04-02 22:31:44,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:44,789 INFO L225 Difference]: With dead ends: 119 [2023-04-02 22:31:44,790 INFO L226 Difference]: Without dead ends: 78 [2023-04-02 22:31:44,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:31:44,790 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 9 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:44,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 210 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:44,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-04-02 22:31:44,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-04-02 22:31:44,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 50 states have (on average 1.3) internal successors, (65), 54 states have internal predecessors, (65), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (15), 12 states have call predecessors, (15), 14 states have call successors, (15) [2023-04-02 22:31:44,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 97 transitions. [2023-04-02 22:31:44,811 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 97 transitions. Word has length 55 [2023-04-02 22:31:44,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:44,811 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 97 transitions. [2023-04-02 22:31:44,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 4.285714285714286) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-04-02 22:31:44,811 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 97 transitions. [2023-04-02 22:31:44,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 22:31:44,812 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:44,812 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] [2023-04-02 22:31:44,822 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:45,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:45,022 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:45,023 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:45,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1794341679, now seen corresponding path program 4 times [2023-04-02 22:31:45,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:45,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673596612] [2023-04-02 22:31:45,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:45,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:45,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:45,215 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-02 22:31:45,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:45,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673596612] [2023-04-02 22:31:45,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673596612] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:45,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394860060] [2023-04-02 22:31:45,216 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:31:45,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:45,216 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:45,217 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:45,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 22:31:45,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:45,330 INFO L262 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-02 22:31:45,331 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:45,444 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-02 22:31:45,444 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:31:45,703 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-02 22:31:45,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394860060] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:31:45,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1439062761] [2023-04-02 22:31:45,704 INFO L159 IcfgInterpreter]: Started Sifa with 41 locations of interest [2023-04-02 22:31:45,704 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:31:45,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:31:45,705 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:31:45,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:31:45,718 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:31:46,059 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:31:46,163 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:31:46,175 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2023-04-02 22:31:46,182 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:31:46,184 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:31:46,186 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:31:46,314 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:31:46,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:31:46,323 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:31:48,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10346#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_check_#in~a.base_BEFORE_CALL_19| Int)) (and (<= (+ |v_check_#in~a.base_BEFORE_CALL_19| 1) |#StackHeapBarrier|) (not (= (select (select |#memory_int| |v_check_#in~a.base_BEFORE_CALL_19|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:31:48,455 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:31:48,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:31:48,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 18 [2023-04-02 22:31:48,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048326495] [2023-04-02 22:31:48,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:31:48,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-02 22:31:48,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:31:48,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-02 22:31:48,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2451, Unknown=2, NotChecked=0, Total=2652 [2023-04-02 22:31:48,456 INFO L87 Difference]: Start difference. First operand 78 states and 97 transitions. Second operand has 18 states, 15 states have (on average 3.066666666666667) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:31:48,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:31:48,665 INFO L93 Difference]: Finished difference Result 107 states and 140 transitions. [2023-04-02 22:31:48,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:31:48,666 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 3.066666666666667) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 56 [2023-04-02 22:31:48,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:31:48,667 INFO L225 Difference]: With dead ends: 107 [2023-04-02 22:31:48,667 INFO L226 Difference]: Without dead ends: 95 [2023-04-02 22:31:48,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 115 SyntacticMatches, 13 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=223, Invalid=2745, Unknown=2, NotChecked=0, Total=2970 [2023-04-02 22:31:48,668 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 8 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:31:48,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 440 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:31:48,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-04-02 22:31:48,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 84. [2023-04-02 22:31:48,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 55 states have (on average 1.3454545454545455) internal successors, (74), 60 states have internal predecessors, (74), 17 states have call successors, (17), 11 states have call predecessors, (17), 11 states have return successors, (16), 12 states have call predecessors, (16), 14 states have call successors, (16) [2023-04-02 22:31:48,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 107 transitions. [2023-04-02 22:31:48,690 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 107 transitions. Word has length 56 [2023-04-02 22:31:48,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:31:48,691 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 107 transitions. [2023-04-02 22:31:48,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 3.066666666666667) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:31:48,691 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 107 transitions. [2023-04-02 22:31:48,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-04-02 22:31:48,691 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:31:48,691 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, 1, 1, 1, 1, 1] [2023-04-02 22:31:48,696 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 22:31:48,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 22:31:48,892 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:31:48,892 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:31:48,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1918923697, now seen corresponding path program 1 times [2023-04-02 22:31:48,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:31:48,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606265107] [2023-04-02 22:31:48,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:48,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:31:48,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:50,964 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:31:50,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:31:50,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606265107] [2023-04-02 22:31:50,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606265107] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:31:50,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368730036] [2023-04-02 22:31:50,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:31:50,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:31:50,965 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:31:50,966 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:31:50,968 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 22:31:51,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:31:51,058 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 124 conjunts are in the unsatisfiable core [2023-04-02 22:31:51,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:31:51,068 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 [2023-04-02 22:31:51,127 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 [2023-04-02 22:31:51,213 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-02 22:31:51,213 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 [2023-04-02 22:31:51,257 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 15 treesize of output 10 [2023-04-02 22:31:51,335 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 [2023-04-02 22:31:51,386 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 [2023-04-02 22:31:51,815 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 46 treesize of output 40 [2023-04-02 22:31:52,220 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse4 (div |c_downsweep_#in~space| 2))) (and (exists ((v_ArrVal_602 Int)) (= (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse0 (store (select |c_old(#memory_int)| |c_downsweep_#in~a.base|) (+ (* |c_downsweep_#in~n| 4) |c_downsweep_#in~a.offset| (- 4)) v_ArrVal_602)) (.cse1 (+ (* .cse4 8) |c_downsweep_#in~a.offset| (- 4)))) (let ((.cse2 (+ |c_downsweep_#in~a.offset| (- 4) (* .cse4 4))) (.cse3 (select .cse0 .cse1))) (store (store .cse0 .cse1 (+ (select .cse0 .cse2) .cse3)) .cse2 .cse3)))) |c_#memory_int|)) (< 0 .cse4))) is different from true [2023-04-02 22:31:52,244 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 102 treesize of output 94 [2023-04-02 22:32:10,716 INFO L321 Elim1Store]: treesize reduction 8, result has 75.8 percent of original size [2023-04-02 22:32:10,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 246 treesize of output 256 [2023-04-02 22:32:10,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 2 not checked. [2023-04-02 22:32:10,940 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:33:13,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368730036] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:33:13,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691878815] [2023-04-02 22:33:13,318 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-04-02 22:33:13,318 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:33:13,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:33:13,318 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:33:13,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:33:13,328 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 22:33:13,652 INFO L197 IcfgInterpreter]: Interpreting procedure downsweep with input of size 31 for LOIs [2023-04-02 22:33:13,766 INFO L197 IcfgInterpreter]: Interpreting procedure check with input of size 28 for LOIs [2023-04-02 22:33:13,956 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 22:33:13,972 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.meminit with input of size 26 for LOIs [2023-04-02 22:33:13,974 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-04-02 22:33:13,990 INFO L197 IcfgInterpreter]: Interpreting procedure upsweep with input of size 26 for LOIs [2023-04-02 22:33:14,143 INFO L197 IcfgInterpreter]: Interpreting procedure is_pow2 with input of size 13 for LOIs [2023-04-02 22:33:14,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:33:14,153 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:33:41,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10969#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:33:41,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:33:41,613 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:33:41,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 36] total 62 [2023-04-02 22:33:41,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800156319] [2023-04-02 22:33:41,613 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:33:41,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-04-02 22:33:41,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:33:41,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-04-02 22:33:41,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=9673, Unknown=56, NotChecked=198, Total=10302 [2023-04-02 22:33:41,616 INFO L87 Difference]: Start difference. First operand 84 states and 107 transitions. Second operand has 62 states, 45 states have (on average 1.4) internal successors, (63), 46 states have internal predecessors, (63), 14 states have call successors, (19), 8 states have call predecessors, (19), 9 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2023-04-02 22:33:44,358 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 22:33:48,947 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 22:33:56,700 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0]