./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2879b5362dad4ee344e02d12e11f7b45d4f36399 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 03:32:46,201 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 03:32:46,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 03:32:46,224 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 03:32:46,225 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 03:32:46,225 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 03:32:46,226 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 03:32:46,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 03:32:46,229 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 03:32:46,229 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 03:32:46,230 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 03:32:46,238 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 03:32:46,238 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 03:32:46,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 03:32:46,240 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 03:32:46,241 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 03:32:46,242 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 03:32:46,243 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 03:32:46,244 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 03:32:46,245 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 03:32:46,246 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 03:32:46,247 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 03:32:46,248 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 03:32:46,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 03:32:46,250 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 03:32:46,250 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 03:32:46,250 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 03:32:46,251 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 03:32:46,251 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 03:32:46,252 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 03:32:46,252 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 03:32:46,253 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 03:32:46,253 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 03:32:46,254 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 03:32:46,255 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 03:32:46,255 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 03:32:46,255 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 03:32:46,256 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 03:32:46,256 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 03:32:46,256 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 03:32:46,257 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 03:32:46,269 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 03:32:46,293 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 03:32:46,293 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 03:32:46,293 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 03:32:46,293 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 03:32:46,294 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 03:32:46,294 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 03:32:46,295 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 03:32:46,295 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 03:32:46,296 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 03:32:46,297 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 03:32:46,297 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 03:32:46,297 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 03:32:46,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 03:32:46,297 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 03:32:46,297 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 03:32:46,298 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 03:32:46,298 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 03:32:46,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 03:32:46,298 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 03:32:46,298 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 03:32:46,298 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2879b5362dad4ee344e02d12e11f7b45d4f36399 [2021-08-26 03:32:46,523 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 03:32:46,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 03:32:46,549 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 03:32:46,550 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 03:32:46,550 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 03:32:46,551 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2021-08-26 03:32:46,587 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/02e3083fc/91eb761fd1c544148a8061233e7873ab/FLAGe635c6ef4 [2021-08-26 03:32:46,946 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 03:32:46,946 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2021-08-26 03:32:46,950 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/02e3083fc/91eb761fd1c544148a8061233e7873ab/FLAGe635c6ef4 [2021-08-26 03:32:46,961 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/02e3083fc/91eb761fd1c544148a8061233e7873ab [2021-08-26 03:32:46,964 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 03:32:46,966 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 03:32:46,967 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 03:32:46,967 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 03:32:46,969 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 03:32:46,969 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:32:46" (1/1) ... [2021-08-26 03:32:46,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d3e2561 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:46, skipping insertion in model container [2021-08-26 03:32:46,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:32:46" (1/1) ... [2021-08-26 03:32:46,974 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 03:32:46,983 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 03:32:47,087 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c[327,340] [2021-08-26 03:32:47,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 03:32:47,102 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 03:32:47,111 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c[327,340] [2021-08-26 03:32:47,112 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 03:32:47,120 INFO L208 MainTranslator]: Completed translation [2021-08-26 03:32:47,120 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47 WrapperNode [2021-08-26 03:32:47,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 03:32:47,122 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 03:32:47,122 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 03:32:47,123 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 03:32:47,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,130 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,173 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 03:32:47,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 03:32:47,175 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 03:32:47,175 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 03:32:47,179 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,179 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,184 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,186 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,189 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,190 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 03:32:47,191 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 03:32:47,191 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 03:32:47,191 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 03:32:47,192 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (1/1) ... [2021-08-26 03:32:47,195 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 03:32:47,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:47,246 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) [2021-08-26 03:32:47,293 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 [2021-08-26 03:32:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 03:32:47,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 03:32:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 03:32:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 03:32:47,483 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 03:32:47,484 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-08-26 03:32:47,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:32:47 BoogieIcfgContainer [2021-08-26 03:32:47,485 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 03:32:47,486 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 03:32:47,486 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 03:32:47,488 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 03:32:47,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 03:32:46" (1/3) ... [2021-08-26 03:32:47,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f78e0c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:32:47, skipping insertion in model container [2021-08-26 03:32:47,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:32:47" (2/3) ... [2021-08-26 03:32:47,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f78e0c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:32:47, skipping insertion in model container [2021-08-26 03:32:47,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:32:47" (3/3) ... [2021-08-26 03:32:47,490 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2021-08-26 03:32:47,494 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 03:32:47,494 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 03:32:47,537 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 03:32:47,543 INFO L339 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, mConcurrency=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, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 03:32:47,543 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 03:32:47,551 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:47,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-08-26 03:32:47,554 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:47,554 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-08-26 03:32:47,555 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:47,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:47,559 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2021-08-26 03:32:47,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:47,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272567998] [2021-08-26 03:32:47,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:47,565 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:47,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:47,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:47,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:47,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272567998] [2021-08-26 03:32:47,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272567998] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 03:32:47,785 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 03:32:47,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-08-26 03:32:47,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177136466] [2021-08-26 03:32:47,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-26 03:32:47,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:47,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-26 03:32:47,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-26 03:32:47,801 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:47,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:47,834 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2021-08-26 03:32:47,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-26 03:32:47,835 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-08-26 03:32:47,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:47,840 INFO L225 Difference]: With dead ends: 18 [2021-08-26 03:32:47,840 INFO L226 Difference]: Without dead ends: 8 [2021-08-26 03:32:47,841 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-26 03:32:47,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-08-26 03:32:47,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-08-26 03:32:47,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:47,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2021-08-26 03:32:47,866 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2021-08-26 03:32:47,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:47,866 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2021-08-26 03:32:47,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:47,867 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2021-08-26 03:32:47,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-08-26 03:32:47,867 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:47,867 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:47,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 03:32:47,868 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:47,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:47,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2021-08-26 03:32:47,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:47,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011343490] [2021-08-26 03:32:47,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:47,871 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:47,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:48,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:48,007 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:48,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011343490] [2021-08-26 03:32:48,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011343490] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:48,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373607980] [2021-08-26 03:32:48,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:48,008 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:48,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:48,025 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) [2021-08-26 03:32:48,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 03:32:48,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:48,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 03:32:48,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 03:32:48,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:48,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373607980] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:48,140 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 03:32:48,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-08-26 03:32:48,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957671730] [2021-08-26 03:32:48,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-26 03:32:48,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:48,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-26 03:32:48,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-26 03:32:48,143 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:48,162 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2021-08-26 03:32:48,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-26 03:32:48,162 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-08-26 03:32:48,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:48,163 INFO L225 Difference]: With dead ends: 13 [2021-08-26 03:32:48,163 INFO L226 Difference]: Without dead ends: 9 [2021-08-26 03:32:48,163 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 34.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-26 03:32:48,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-08-26 03:32:48,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-08-26 03:32:48,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-08-26 03:32:48,165 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2021-08-26 03:32:48,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:48,165 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-08-26 03:32:48,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,166 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-08-26 03:32:48,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-08-26 03:32:48,166 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:48,166 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:48,211 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 03:32:48,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:48,397 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:48,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:48,398 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2021-08-26 03:32:48,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:48,398 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587315281] [2021-08-26 03:32:48,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:48,398 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:48,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:48,486 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:48,486 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:48,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587315281] [2021-08-26 03:32:48,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587315281] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:48,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813295459] [2021-08-26 03:32:48,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 03:32:48,487 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:48,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:48,501 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) [2021-08-26 03:32:48,508 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 03:32:48,554 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 03:32:48,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 03:32:48,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-26 03:32:48,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 03:32:48,631 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:48,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813295459] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:48,632 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 03:32:48,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-08-26 03:32:48,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667900317] [2021-08-26 03:32:48,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 03:32:48,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:48,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 03:32:48,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-08-26 03:32:48,633 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:48,655 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2021-08-26 03:32:48,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 03:32:48,656 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-08-26 03:32:48,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:48,656 INFO L225 Difference]: With dead ends: 14 [2021-08-26 03:32:48,656 INFO L226 Difference]: Without dead ends: 10 [2021-08-26 03:32:48,656 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 51.8ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-08-26 03:32:48,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-08-26 03:32:48,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-08-26 03:32:48,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2021-08-26 03:32:48,658 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2021-08-26 03:32:48,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:48,658 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2021-08-26 03:32:48,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:48,658 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2021-08-26 03:32:48,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-08-26 03:32:48,658 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:48,659 INFO L512 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:48,693 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-08-26 03:32:48,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-08-26 03:32:48,898 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:48,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:48,898 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2021-08-26 03:32:48,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:48,899 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030318678] [2021-08-26 03:32:48,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:48,899 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:48,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:49,007 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:49,008 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:49,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030318678] [2021-08-26 03:32:49,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030318678] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:49,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685250665] [2021-08-26 03:32:49,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 03:32:49,009 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:49,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:49,009 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) [2021-08-26 03:32:49,071 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 03:32:49,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-08-26 03:32:49,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 03:32:49,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-26 03:32:49,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 03:32:49,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:49,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685250665] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:49,128 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 03:32:49,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-08-26 03:32:49,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493197444] [2021-08-26 03:32:49,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 03:32:49,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:49,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 03:32:49,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-08-26 03:32:49,129 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:49,154 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2021-08-26 03:32:49,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 03:32:49,154 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-08-26 03:32:49,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:49,155 INFO L225 Difference]: With dead ends: 15 [2021-08-26 03:32:49,155 INFO L226 Difference]: Without dead ends: 11 [2021-08-26 03:32:49,155 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 33.2ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-08-26 03:32:49,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-08-26 03:32:49,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-08-26 03:32:49,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2021-08-26 03:32:49,157 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2021-08-26 03:32:49,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:49,157 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2021-08-26 03:32:49,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,158 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2021-08-26 03:32:49,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 03:32:49,158 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:49,158 INFO L512 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:49,175 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 03:32:49,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:49,373 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:49,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:49,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2021-08-26 03:32:49,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:49,374 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720583966] [2021-08-26 03:32:49,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:49,374 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:49,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:49,452 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:49,452 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:49,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720583966] [2021-08-26 03:32:49,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720583966] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:49,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589925904] [2021-08-26 03:32:49,453 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 03:32:49,453 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:49,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:49,454 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) [2021-08-26 03:32:49,455 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 03:32:49,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 03:32:49,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 03:32:49,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 14 conjunts are in the unsatisfiable core [2021-08-26 03:32:49,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 03:32:49,548 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:49,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589925904] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:49,549 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 03:32:49,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-08-26 03:32:49,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989974619] [2021-08-26 03:32:49,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-26 03:32:49,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:49,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-26 03:32:49,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-08-26 03:32:49,550 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:49,576 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2021-08-26 03:32:49,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 03:32:49,577 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-08-26 03:32:49,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:49,577 INFO L225 Difference]: With dead ends: 16 [2021-08-26 03:32:49,577 INFO L226 Difference]: Without dead ends: 12 [2021-08-26 03:32:49,577 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 38.4ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-08-26 03:32:49,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-08-26 03:32:49,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-08-26 03:32:49,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-08-26 03:32:49,579 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2021-08-26 03:32:49,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:49,579 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-08-26 03:32:49,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:49,580 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-08-26 03:32:49,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-26 03:32:49,580 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:49,580 INFO L512 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:49,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 03:32:49,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:49,797 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:49,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:49,797 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2021-08-26 03:32:49,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:49,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248258784] [2021-08-26 03:32:49,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:49,797 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:49,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:32:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:49,885 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:32:49,885 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248258784] [2021-08-26 03:32:49,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248258784] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:49,885 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044002256] [2021-08-26 03:32:49,886 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 03:32:49,886 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:49,886 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:32:49,890 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) [2021-08-26 03:32:49,891 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 03:32:49,945 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-08-26 03:32:49,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 03:32:49,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-26 03:32:49,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 03:32:50,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:32:50,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044002256] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 03:32:50,073 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 03:32:50,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-08-26 03:32:50,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107034783] [2021-08-26 03:32:50,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 03:32:50,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:32:50,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 03:32:50,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-08-26 03:32:50,075 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:50,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:32:50,107 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2021-08-26 03:32:50,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-26 03:32:50,108 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-08-26 03:32:50,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:32:50,109 INFO L225 Difference]: With dead ends: 17 [2021-08-26 03:32:50,109 INFO L226 Difference]: Without dead ends: 13 [2021-08-26 03:32:50,109 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 52.3ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-08-26 03:32:50,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-08-26 03:32:50,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-08-26 03:32:50,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:50,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-08-26 03:32:50,113 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-08-26 03:32:50,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:32:50,113 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-08-26 03:32:50,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:32:50,114 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-08-26 03:32:50,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-26 03:32:50,115 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:32:50,115 INFO L512 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2021-08-26 03:32:50,134 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-26 03:32:50,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 03:32:50,315 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:32:50,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:32:50,316 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2021-08-26 03:32:50,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:32:50,316 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040216233] [2021-08-26 03:32:50,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:32:50,316 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:32:50,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 03:32:50,327 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 03:32:50,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 03:32:50,364 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 03:32:50,364 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 03:32:50,374 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 03:32:50,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-08-26 03:32:50,383 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 03:32:50,422 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 03:32:50 BoogieIcfgContainer [2021-08-26 03:32:50,422 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 03:32:50,423 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 03:32:50,423 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 03:32:50,423 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 03:32:50,423 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:32:47" (3/4) ... [2021-08-26 03:32:50,425 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 03:32:50,472 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 03:32:50,472 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 03:32:50,473 INFO L168 Benchmark]: Toolchain (without parser) took 3506.56 ms. Allocated memory was 46.1 MB in the beginning and 100.7 MB in the end (delta: 54.5 MB). Free memory was 22.6 MB in the beginning and 60.9 MB in the end (delta: -38.4 MB). Peak memory consumption was 15.0 MB. Max. memory is 16.1 GB. [2021-08-26 03:32:50,473 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 46.1 MB. Free memory was 28.8 MB in the beginning and 28.8 MB in the end (delta: 27.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:32:50,473 INFO L168 Benchmark]: CACSL2BoogieTranslator took 154.75 ms. Allocated memory was 46.1 MB in the beginning and 62.9 MB in the end (delta: 16.8 MB). Free memory was 22.4 MB in the beginning and 41.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 3.4 MB. Max. memory is 16.1 GB. [2021-08-26 03:32:50,473 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.36 ms. Allocated memory is still 62.9 MB. Free memory was 41.0 MB in the beginning and 47.4 MB in the end (delta: -6.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 03:32:50,474 INFO L168 Benchmark]: Boogie Preprocessor took 15.18 ms. Allocated memory is still 62.9 MB. Free memory was 47.4 MB in the beginning and 46.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:32:50,474 INFO L168 Benchmark]: RCFGBuilder took 294.39 ms. Allocated memory is still 62.9 MB. Free memory was 46.4 MB in the beginning and 35.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-26 03:32:50,474 INFO L168 Benchmark]: TraceAbstraction took 2936.24 ms. Allocated memory was 62.9 MB in the beginning and 100.7 MB in the end (delta: 37.7 MB). Free memory was 35.2 MB in the beginning and 63.1 MB in the end (delta: -27.9 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. [2021-08-26 03:32:50,474 INFO L168 Benchmark]: Witness Printer took 49.17 ms. Allocated memory is still 100.7 MB. Free memory was 63.1 MB in the beginning and 60.9 MB in the end (delta: 2.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:32:50,475 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 46.1 MB. Free memory was 28.8 MB in the beginning and 28.8 MB in the end (delta: 27.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 154.75 ms. Allocated memory was 46.1 MB in the beginning and 62.9 MB in the end (delta: 16.8 MB). Free memory was 22.4 MB in the beginning and 41.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 3.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 51.36 ms. Allocated memory is still 62.9 MB. Free memory was 41.0 MB in the beginning and 47.4 MB in the end (delta: -6.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 15.18 ms. Allocated memory is still 62.9 MB. Free memory was 47.4 MB in the beginning and 46.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 294.39 ms. Allocated memory is still 62.9 MB. Free memory was 46.4 MB in the beginning and 35.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2936.24 ms. Allocated memory was 62.9 MB in the beginning and 100.7 MB in the end (delta: 37.7 MB). Free memory was 35.2 MB in the beginning and 63.1 MB in the end (delta: -27.9 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. * Witness Printer took 49.17 ms. Allocated memory is still 100.7 MB. Free memory was 63.1 MB in the beginning and 60.9 MB in the end (delta: 2.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 2842.7ms, OverallIterations: 7, TraceHistogramMax: 6, EmptinessCheckTime: 7.3ms, AutomataDifference: 187.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 39 SDtfs, 2 SDslu, 75 SDs, 0 SdLazy, 172 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 101.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 236.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=13occurred in iteration=6, InterpolantAutomatonStates: 34, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 19.2ms AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 42.4ms SsaConstructionTime, 154.0ms SatisfiabilityAnalysisTime, 926.2ms InterpolantComputationTime, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 321 SizeOfPredicates, 0 NumberOfNonLiveVariables, 290 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 03:32:50,504 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...