/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/loops-crafted-1/iftelse.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:03:49,598 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:03:49,599 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:03:49,643 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 23:03:49,644 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 23:03:49,647 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 23:03:49,650 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 23:03:49,652 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 23:03:49,653 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 23:03:49,658 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 23:03:49,659 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 23:03:49,660 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 23:03:49,661 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 23:03:49,663 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 23:03:49,664 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 23:03:49,664 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 23:03:49,665 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 23:03:49,665 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 23:03:49,667 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 23:03:49,671 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 23:03:49,672 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 23:03:49,672 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 23:03:49,673 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 23:03:49,674 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 23:03:49,680 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 23:03:49,681 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 23:03:49,681 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 23:03:49,682 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 23:03:49,682 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 23:03:49,683 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 23:03:49,683 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 23:03:49,683 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 23:03:49,684 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 23:03:49,685 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 23:03:49,685 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 23:03:49,686 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 23:03:49,686 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 23:03:49,686 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 23:03:49,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:03:49,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:03:49,687 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:03:49,688 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 23:03:49,713 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:03:49,713 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:03:49,714 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:03:49,714 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:03:49,714 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:03:49,715 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:03:49,715 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:03:49,715 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:03:49,715 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:03:49,715 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:03:49,716 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:03:49,716 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:03:49,717 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:03:49,717 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:03:49,717 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:03:49,717 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:03:49,717 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:03:49,717 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:03:49,718 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:03:49,718 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:03:49,718 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:03:49,718 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:03:49,718 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:03:49,719 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:03:49,719 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:03:49,719 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:03:49,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:03:49,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:03:49,719 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:03:49,719 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:03:49,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:03:49,895 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:03:49,910 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:03:49,911 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:03:49,912 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:03:49,913 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:03:49,913 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/iftelse.c [2023-03-31 23:03:50,924 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:03:51,069 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:03:51,070 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/iftelse.c [2023-03-31 23:03:51,073 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dba2be20d/e527cf5247d04b6b9a3ef0c0ebcb994a/FLAG5fcdbc340 [2023-03-31 23:03:51,082 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dba2be20d/e527cf5247d04b6b9a3ef0c0ebcb994a [2023-03-31 23:03:51,084 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:03:51,085 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:03:51,086 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:03:51,086 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:03:51,088 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:03:51,089 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,090 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f65a21e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51, skipping insertion in model container [2023-03-31 23:03:51,090 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:03:51,103 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:03:51,219 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/iftelse.c[406,419] [2023-03-31 23:03:51,235 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:03:51,243 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:03:51,251 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/iftelse.c[406,419] [2023-03-31 23:03:51,255 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:03:51,293 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:03:51,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51 WrapperNode [2023-03-31 23:03:51,293 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:03:51,294 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:03:51,294 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:03:51,294 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:03:51,301 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,305 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,305 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,310 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,310 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,311 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,312 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:03:51,313 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:03:51,313 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:03:51,313 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:03:51,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (1/1) ... [2023-03-31 23:03:51,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:03:51,324 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:03:51,333 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 23:03:51,336 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 23:03:51,375 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:03:51,376 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:03:51,376 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:03:51,379 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 23:03:51,379 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:03:51,379 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:03:51,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:03:51,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:03:51,449 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:03:51,451 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:03:51,611 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:03:51,662 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:03:51,662 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 23:03:51,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:03:51 BoogieIcfgContainer [2023-03-31 23:03:51,664 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:03:51,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:03:51,665 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:03:51,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:03:51,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:03:51" (1/3) ... [2023-03-31 23:03:51,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b856f62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:03:51, skipping insertion in model container [2023-03-31 23:03:51,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:03:51" (2/3) ... [2023-03-31 23:03:51,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b856f62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:03:51, skipping insertion in model container [2023-03-31 23:03:51,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:03:51" (3/3) ... [2023-03-31 23:03:51,686 INFO L112 eAbstractionObserver]: Analyzing ICFG iftelse.c [2023-03-31 23:03:51,716 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:03:51,716 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:03:51,750 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:03:51,758 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;@4c0b3859, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:03:51,759 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:03:51,762 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:03:51,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-03-31 23:03:51,769 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:03:51,769 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:03:51,770 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:03:51,774 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:03:51,775 INFO L85 PathProgramCache]: Analyzing trace with hash 352206972, now seen corresponding path program 1 times [2023-03-31 23:03:51,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:03:51,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531300550] [2023-03-31 23:03:51,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:03:51,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:03:51,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:03:52,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:03:52,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:03:52,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531300550] [2023-03-31 23:03:52,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531300550] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:03:52,407 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:03:52,407 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-03-31 23:03:52,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300219324] [2023-03-31 23:03:52,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:03:52,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-03-31 23:03:52,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:03:52,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-03-31 23:03:52,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-03-31 23:03:52,436 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:03:52,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:03:52,576 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2023-03-31 23:03:52,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 23:03:52,578 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-03-31 23:03:52,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:03:52,583 INFO L225 Difference]: With dead ends: 44 [2023-03-31 23:03:52,583 INFO L226 Difference]: Without dead ends: 23 [2023-03-31 23:03:52,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-03-31 23:03:52,587 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:03:52,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 85 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:03:52,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-03-31 23:03:52,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-03-31 23:03:52,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:03:52,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-03-31 23:03:52,613 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 12 [2023-03-31 23:03:52,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:03:52,614 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-03-31 23:03:52,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:03:52,614 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-03-31 23:03:52,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 23:03:52,616 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:03:52,616 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:03:52,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:03:52,616 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:03:52,617 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:03:52,617 INFO L85 PathProgramCache]: Analyzing trace with hash -2134040423, now seen corresponding path program 1 times [2023-03-31 23:03:52,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:03:52,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280504724] [2023-03-31 23:03:52,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:03:52,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:03:52,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:03:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:03:52,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:03:52,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280504724] [2023-03-31 23:03:52,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280504724] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:03:52,670 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:03:52,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 23:03:52,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269319409] [2023-03-31 23:03:52,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:03:52,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 23:03:52,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:03:52,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 23:03:52,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:03:52,672 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:03:52,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:03:52,688 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2023-03-31 23:03:52,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 23:03:52,689 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-03-31 23:03:52,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:03:52,691 INFO L225 Difference]: With dead ends: 32 [2023-03-31 23:03:52,691 INFO L226 Difference]: Without dead ends: 22 [2023-03-31 23:03:52,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:03:52,697 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:03:52,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:03:52,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-03-31 23:03:52,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-03-31 23:03:52,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:03:52,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2023-03-31 23:03:52,715 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 14 [2023-03-31 23:03:52,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:03:52,715 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2023-03-31 23:03:52,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:03:52,715 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2023-03-31 23:03:52,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 23:03:52,716 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:03:52,716 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:03:52,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 23:03:52,716 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:03:52,717 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:03:52,717 INFO L85 PathProgramCache]: Analyzing trace with hash 615018288, now seen corresponding path program 1 times [2023-03-31 23:03:52,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:03:52,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961554204] [2023-03-31 23:03:52,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:03:52,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:03:52,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:03:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:03:53,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:03:53,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961554204] [2023-03-31 23:03:53,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961554204] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:03:53,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220263494] [2023-03-31 23:03:53,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:03:53,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:03:53,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:03:53,166 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:03:53,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 23:03:53,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:03:53,223 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 23 conjunts are in the unsatisfiable core [2023-03-31 23:03:53,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:03:53,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:03:53,362 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:03:54,538 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:03:54,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220263494] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:03:54,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029853082] [2023-03-31 23:03:54,558 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-03-31 23:03:54,558 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:03:54,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:03:54,566 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:03:54,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:03:54,622 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 11 for LOIs [2023-03-31 23:03:54,777 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-03-31 23:03:54,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:03:54,812 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:03:55,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '330#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= ~SIZE~0 20000001) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:03:55,301 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:03:55,301 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:03:55,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 18 [2023-03-31 23:03:55,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886430601] [2023-03-31 23:03:55,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:03:55,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-03-31 23:03:55,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:03:55,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-03-31 23:03:55,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2023-03-31 23:03:55,303 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 16 states have internal predecessors, (30), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:03:57,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:03:57,393 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2023-03-31 23:03:57,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 23:03:57,394 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 16 states have internal predecessors, (30), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 19 [2023-03-31 23:03:57,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:03:57,395 INFO L225 Difference]: With dead ends: 40 [2023-03-31 23:03:57,395 INFO L226 Difference]: Without dead ends: 38 [2023-03-31 23:03:57,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=153, Invalid=839, Unknown=0, NotChecked=0, Total=992 [2023-03-31 23:03:57,396 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 23:03:57,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 73 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-03-31 23:03:57,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-03-31 23:03:57,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-03-31 23:03:57,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 25 states have (on average 1.04) internal successors, (26), 26 states have internal predecessors, (26), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2023-03-31 23:03:57,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2023-03-31 23:03:57,405 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 19 [2023-03-31 23:03:57,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:03:57,405 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2023-03-31 23:03:57,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 16 states have internal predecessors, (30), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:03:57,406 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2023-03-31 23:03:57,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-03-31 23:03:57,407 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:03:57,407 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:03:57,427 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 23:03:57,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:03:57,612 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:03:57,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:03:57,613 INFO L85 PathProgramCache]: Analyzing trace with hash 196482096, now seen corresponding path program 2 times [2023-03-31 23:03:57,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:03:57,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273188401] [2023-03-31 23:03:57,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:03:57,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:03:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:03:58,388 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-03-31 23:03:58,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:03:58,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273188401] [2023-03-31 23:03:58,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273188401] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:03:58,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535298432] [2023-03-31 23:03:58,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:03:58,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:03:58,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:03:58,393 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:03:58,409 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 23:04:07,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-03-31 23:04:07,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:04:07,305 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 44 conjunts are in the unsatisfiable core [2023-03-31 23:04:07,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:04:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 26 proven. 47 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 23:04:07,684 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:04:17,019 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 26 proven. 47 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 23:04:17,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535298432] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:04:17,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843930163] [2023-03-31 23:04:17,027 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-03-31 23:04:17,027 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:04:17,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:04:17,027 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:04:17,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:04:17,054 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 11 for LOIs [2023-03-31 23:04:17,160 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-03-31 23:04:17,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:04:17,180 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:04:18,609 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '779#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= ~SIZE~0 20000001) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:04:18,609 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:04:18,609 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:04:18,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17, 15] total 36 [2023-03-31 23:04:18,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680412119] [2023-03-31 23:04:18,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:04:18,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-03-31 23:04:18,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:04:18,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-03-31 23:04:18,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1838, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 23:04:18,612 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 36 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 31 states have internal predecessors, (56), 20 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (17), 17 states have call predecessors, (17), 16 states have call successors, (17) [2023-03-31 23:04:26,805 WARN L223 SmtUtils]: Spent 5.99s on a formula simplification. DAG size of input: 82 DAG size of output: 71 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-03-31 23:04:48,241 WARN L223 SmtUtils]: Spent 11.48s on a formula simplification. DAG size of input: 64 DAG size of output: 44 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-03-31 23:05:02,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:05:02,766 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2023-03-31 23:05:02,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-03-31 23:05:02,767 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 31 states have internal predecessors, (56), 20 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (17), 17 states have call predecessors, (17), 16 states have call successors, (17) Word has length 47 [2023-03-31 23:05:02,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:05:02,768 INFO L225 Difference]: With dead ends: 65 [2023-03-31 23:05:02,768 INFO L226 Difference]: Without dead ends: 63 [2023-03-31 23:05:02,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 760 ImplicationChecksByTransitivity, 46.9s TimeCoverageRelationStatistics Valid=470, Invalid=3690, Unknown=0, NotChecked=0, Total=4160 [2023-03-31 23:05:02,770 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 57 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2023-03-31 23:05:02,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 100 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2023-03-31 23:05:02,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-03-31 23:05:02,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-03-31 23:05:02,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 43 states have internal predecessors, (43), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:05:02,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2023-03-31 23:05:02,783 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 47 [2023-03-31 23:05:02,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:05:02,783 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2023-03-31 23:05:02,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 31 states have internal predecessors, (56), 20 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (17), 17 states have call predecessors, (17), 16 states have call successors, (17) [2023-03-31 23:05:02,784 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2023-03-31 23:05:02,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-03-31 23:05:02,785 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:05:02,785 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:05:02,791 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 23:05:02,990 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 [2023-03-31 23:05:02,991 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:05:02,991 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:05:02,991 INFO L85 PathProgramCache]: Analyzing trace with hash 2083239548, now seen corresponding path program 3 times [2023-03-31 23:05:02,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:05:02,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539573567] [2023-03-31 23:05:02,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:05:02,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:05:03,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:05:04,100 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 16 proven. 108 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:05:04,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:05:04,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539573567] [2023-03-31 23:05:04,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539573567] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:05:04,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13646096] [2023-03-31 23:05:04,101 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:05:04,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:05:04,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:05:04,117 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:05:04,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 23:05:04,664 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:05:04,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:05:04,667 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 48 conjunts are in the unsatisfiable core [2023-03-31 23:05:04,670 INFO L285 TraceCheckSpWp]: Computing forward predicates...