./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan --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 Taipan --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 0.2.0-a4ecdab [2020-11-30 01:35:48,095 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 01:35:48,099 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 01:35:48,207 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 01:35:48,208 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 01:35:48,217 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 01:35:48,220 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 01:35:48,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 01:35:48,233 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 01:35:48,234 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 01:35:48,236 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 01:35:48,238 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 01:35:48,239 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 01:35:48,243 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 01:35:48,246 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 01:35:48,249 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 01:35:48,251 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 01:35:48,262 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 01:35:48,266 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 01:35:48,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 01:35:48,277 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 01:35:48,281 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 01:35:48,284 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 01:35:48,285 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 01:35:48,292 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 01:35:48,293 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 01:35:48,293 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 01:35:48,296 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 01:35:48,297 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 01:35:48,298 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 01:35:48,299 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 01:35:48,300 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 01:35:48,303 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 01:35:48,305 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 01:35:48,306 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 01:35:48,307 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 01:35:48,308 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 01:35:48,308 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 01:35:48,309 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 01:35:48,311 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 01:35:48,313 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 01:35:48,316 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 01:35:48,370 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 01:35:48,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 01:35:48,372 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 01:35:48,373 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 01:35:48,373 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 01:35:48,373 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 01:35:48,374 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 01:35:48,374 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 01:35:48,374 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 01:35:48,374 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 01:35:48,376 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 01:35:48,376 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 01:35:48,376 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 01:35:48,376 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 01:35:48,376 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 01:35:48,377 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 01:35:48,377 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 01:35:48,377 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 01:35:48,378 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 01:35:48,379 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 01:35:48,379 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 01:35:48,379 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 01:35:48,379 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 01:35:48,379 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 01:35:48,380 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 01:35:48,380 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 01:35:48,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:35:48,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 01:35:48,381 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 01:35:48,381 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 01:35:48,381 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 01:35:48,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 01:35:48,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 01:35:48,382 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 01:35:48,383 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 01:35:48,383 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2879b5362dad4ee344e02d12e11f7b45d4f36399 [2020-11-30 01:35:48,790 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:35:48,823 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:35:48,826 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:35:48,828 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:35:48,829 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:35:48,830 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-30 01:35:48,947 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/data/d4d029b9a/1c355c2e6cdc482c944a5fcaa6aefb10/FLAG853ba16b5 [2020-11-30 01:35:49,636 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:35:49,636 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-30 01:35:49,660 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/data/d4d029b9a/1c355c2e6cdc482c944a5fcaa6aefb10/FLAG853ba16b5 [2020-11-30 01:35:49,999 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/data/d4d029b9a/1c355c2e6cdc482c944a5fcaa6aefb10 [2020-11-30 01:35:50,003 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:35:50,009 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:35:50,014 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:35:50,015 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:35:50,020 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:35:50,021 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,024 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77d1a3a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50, skipping insertion in model container [2020-11-30 01:35:50,024 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,035 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:35:50,056 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:35:50,315 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:35:50,344 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:35:50,376 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:35:50,398 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:35:50,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50 WrapperNode [2020-11-30 01:35:50,400 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:35:50,402 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:35:50,402 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:35:50,403 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:35:50,414 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,425 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,450 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:35:50,454 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:35:50,454 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:35:50,455 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:35:50,466 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,466 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,469 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,469 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,476 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,481 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,489 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... [2020-11-30 01:35:50,492 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:35:50,494 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:35:50,494 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:35:50,497 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:35:50,499 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:35:50,599 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:35:50,600 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:35:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 01:35:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 01:35:51,162 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:35:51,162 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-30 01:35:51,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:35:51 BoogieIcfgContainer [2020-11-30 01:35:51,167 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:35:51,169 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:35:51,170 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:35:51,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:35:51,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:35:50" (1/3) ... [2020-11-30 01:35:51,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a7853e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:35:51, skipping insertion in model container [2020-11-30 01:35:51,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:35:50" (2/3) ... [2020-11-30 01:35:51,177 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a7853e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:35:51, skipping insertion in model container [2020-11-30 01:35:51,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:35:51" (3/3) ... [2020-11-30 01:35:51,180 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-11-30 01:35:51,196 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:35:51,202 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 01:35:51,220 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 01:35:51,266 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:35:51,266 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:35:51,267 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:35:51,267 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:35:51,267 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:35:51,268 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:35:51,268 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:35:51,268 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:35:51,286 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-11-30 01:35:51,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 01:35:51,295 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:35:51,296 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 01:35:51,297 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:35:51,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:35:51,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1881255, now seen corresponding path program 1 times [2020-11-30 01:35:51,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:35:51,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553593375] [2020-11-30 01:35:51,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:35:51,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:35:51,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:51,670 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553593375] [2020-11-30 01:35:51,671 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:35:51,672 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 01:35:51,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423325314] [2020-11-30 01:35:51,682 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 01:35:51,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:35:51,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 01:35:51,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 01:35:51,707 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2020-11-30 01:35:51,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:35:51,781 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-30 01:35:51,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 01:35:51,785 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-30 01:35:51,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:35:51,797 INFO L225 Difference]: With dead ends: 13 [2020-11-30 01:35:51,797 INFO L226 Difference]: Without dead ends: 6 [2020-11-30 01:35:51,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 01:35:51,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-11-30 01:35:51,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-11-30 01:35:51,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-30 01:35:51,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-11-30 01:35:51,844 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-11-30 01:35:51,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:35:51,845 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-11-30 01:35:51,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 01:35:51,846 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-11-30 01:35:51,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-30 01:35:51,846 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:35:51,847 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-30 01:35:51,847 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 01:35:51,848 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:35:51,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:35:51,853 INFO L82 PathProgramCache]: Analyzing trace with hash 57620216, now seen corresponding path program 1 times [2020-11-30 01:35:51,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:35:51,853 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827523028] [2020-11-30 01:35:51,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:35:51,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:35:51,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:51,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827523028] [2020-11-30 01:35:51,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196294611] [2020-11-30 01:35:51,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:35:52,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:35:52,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-30 01:35:52,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:35:52,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:52,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:35:52,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:52,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197225522] [2020-11-30 01:35:52,212 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:35:52,212 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:35:52,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:35:52,229 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:35:52,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:35:52,990 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:35:53,160 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 34 [2020-11-30 01:35:53,340 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 22 [2020-11-30 01:35:53,529 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2020-11-30 01:35:53,532 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:35:53,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:35:53,533 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 7 [2020-11-30 01:35:53,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853013614] [2020-11-30 01:35:53,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-30 01:35:53,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:35:53,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-30 01:35:53,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:35:53,536 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 8 states. [2020-11-30 01:35:53,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:35:53,612 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-11-30 01:35:53,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:35:53,613 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 5 [2020-11-30 01:35:53,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:35:53,614 INFO L225 Difference]: With dead ends: 12 [2020-11-30 01:35:53,614 INFO L226 Difference]: Without dead ends: 9 [2020-11-30 01:35:53,615 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-11-30 01:35:53,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-30 01:35:53,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-30 01:35:53,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-30 01:35:53,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-30 01:35:53,619 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-11-30 01:35:53,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:35:53,619 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-30 01:35:53,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-30 01:35:53,619 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-30 01:35:53,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 01:35:53,620 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:35:53,620 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-11-30 01:35:53,821 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-30 01:35:53,821 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:35:53,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:35:53,822 INFO L82 PathProgramCache]: Analyzing trace with hash -2116861721, now seen corresponding path program 2 times [2020-11-30 01:35:53,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:35:53,823 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136981334] [2020-11-30 01:35:53,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:35:53,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:35:54,031 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:54,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136981334] [2020-11-30 01:35:54,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147312198] [2020-11-30 01:35:54,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:35:54,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 01:35:54,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:35:54,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-30 01:35:54,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:35:54,192 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:54,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:35:54,372 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:35:54,372 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2037009286] [2020-11-30 01:35:54,376 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:35:54,376 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:35:54,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:35:54,377 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:35:54,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:35:54,738 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:35:54,906 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 34 [2020-11-30 01:35:55,044 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 22 [2020-11-30 01:35:55,228 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2020-11-30 01:35:55,230 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:35:55,231 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:35:55,231 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 13 [2020-11-30 01:35:55,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554943136] [2020-11-30 01:35:55,232 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-30 01:35:55,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:35:55,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-30 01:35:55,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2020-11-30 01:35:55,233 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 14 states. [2020-11-30 01:35:55,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:35:55,318 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-30 01:35:55,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 01:35:55,320 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 8 [2020-11-30 01:35:55,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:35:55,321 INFO L225 Difference]: With dead ends: 14 [2020-11-30 01:35:55,321 INFO L226 Difference]: Without dead ends: 11 [2020-11-30 01:35:55,322 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2020-11-30 01:35:55,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-30 01:35:55,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-30 01:35:55,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 01:35:55,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-30 01:35:55,326 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-11-30 01:35:55,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:35:55,326 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-30 01:35:55,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-30 01:35:55,326 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-30 01:35:55,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 01:35:55,327 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:35:55,327 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-11-30 01:35:55,530 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-30 01:35:55,531 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:35:55,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:35:55,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1488026375, now seen corresponding path program 3 times [2020-11-30 01:35:55,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:35:55,532 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468437805] [2020-11-30 01:35:55,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:35:55,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:35:55,578 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:35:55,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:35:55,626 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:35:55,656 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 01:35:55,656 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 01:35:55,657 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-30 01:35:55,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:35:55 BoogieIcfgContainer [2020-11-30 01:35:55,697 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:35:55,698 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:35:55,698 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:35:55,698 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:35:55,699 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:35:51" (3/4) ... [2020-11-30 01:35:55,701 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 01:35:55,773 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_8fd6b215-3788-47a1-9c21-32dd245bc703/bin/utaipan/witness.graphml [2020-11-30 01:35:55,773 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:35:55,775 INFO L168 Benchmark]: Toolchain (without parser) took 5765.63 ms. Allocated memory was 111.1 MB in the beginning and 134.2 MB in the end (delta: 23.1 MB). Free memory was 81.5 MB in the beginning and 79.1 MB in the end (delta: 2.4 MB). Peak memory consumption was 27.5 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,775 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 75.5 MB. Free memory is still 37.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:35:55,776 INFO L168 Benchmark]: CACSL2BoogieTranslator took 387.18 ms. Allocated memory is still 111.1 MB. Free memory was 81.3 MB in the beginning and 90.1 MB in the end (delta: -8.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,777 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.88 ms. Allocated memory is still 111.1 MB. Free memory was 90.1 MB in the beginning and 88.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:35:55,777 INFO L168 Benchmark]: Boogie Preprocessor took 38.69 ms. Allocated memory is still 111.1 MB. Free memory was 88.7 MB in the beginning and 87.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,778 INFO L168 Benchmark]: RCFGBuilder took 673.46 ms. Allocated memory is still 111.1 MB. Free memory was 87.4 MB in the beginning and 74.8 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,779 INFO L168 Benchmark]: TraceAbstraction took 4527.72 ms. Allocated memory was 111.1 MB in the beginning and 134.2 MB in the end (delta: 23.1 MB). Free memory was 74.2 MB in the beginning and 81.2 MB in the end (delta: -7.0 MB). Peak memory consumption was 17.9 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,780 INFO L168 Benchmark]: Witness Printer took 75.83 ms. Allocated memory is still 134.2 MB. Free memory was 81.2 MB in the beginning and 79.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-30 01:35:55,784 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 75.5 MB. Free memory is still 37.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 387.18 ms. Allocated memory is still 111.1 MB. Free memory was 81.3 MB in the beginning and 90.1 MB in the end (delta: -8.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.88 ms. Allocated memory is still 111.1 MB. Free memory was 90.1 MB in the beginning and 88.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 38.69 ms. Allocated memory is still 111.1 MB. Free memory was 88.7 MB in the beginning and 87.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 673.46 ms. Allocated memory is still 111.1 MB. Free memory was 87.4 MB in the beginning and 74.8 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4527.72 ms. Allocated memory was 111.1 MB in the beginning and 134.2 MB in the end (delta: 23.1 MB). Free memory was 74.2 MB in the beginning and 81.2 MB in the end (delta: -7.0 MB). Peak memory consumption was 17.9 MB. Max. memory is 16.1 GB. * Witness Printer took 75.83 ms. Allocated memory is still 134.2 MB. Free memory was 81.2 MB in the beginning and 79.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_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) [L3] __assert_fail("0", "underapprox_2-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.3s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 1 SDslu, 30 SDs, 0 SdLazy, 66 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 50 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=11occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 40 NumberOfCodeBlocks, 40 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 944 SizeOfPredicates, 2 NumberOfNonLiveVariables, 111 ConjunctsInSsa, 16 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/33 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! Received shutdown request...