./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/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 3589167bbf5d7f5cd80f4f92aa27b7dbe19a0217 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.2.0-7b2dab5 [2020-12-09 14:21:12,490 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 14:21:12,492 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 14:21:12,518 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 14:21:12,519 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 14:21:12,520 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 14:21:12,521 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 14:21:12,524 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 14:21:12,526 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 14:21:12,527 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 14:21:12,528 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 14:21:12,529 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 14:21:12,529 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 14:21:12,530 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 14:21:12,532 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 14:21:12,533 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 14:21:12,534 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 14:21:12,535 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 14:21:12,537 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 14:21:12,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 14:21:12,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 14:21:12,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 14:21:12,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 14:21:12,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 14:21:12,547 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 14:21:12,547 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 14:21:12,548 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 14:21:12,549 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 14:21:12,549 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 14:21:12,550 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 14:21:12,550 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 14:21:12,551 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 14:21:12,552 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 14:21:12,552 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 14:21:12,553 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 14:21:12,553 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 14:21:12,554 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 14:21:12,554 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 14:21:12,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 14:21:12,555 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 14:21:12,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 14:21:12,556 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 14:21:12,572 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 14:21:12,573 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 14:21:12,573 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 14:21:12,573 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 14:21:12,573 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 14:21:12,574 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 14:21:12,574 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 14:21:12,575 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 14:21:12,575 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 14:21:12,575 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 14:21:12,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 14:21:12,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 14:21:12,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 14:21:12,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 14:21:12,577 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 14:21:12,577 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 14:21:12,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 14:21:12,578 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 14:21:12,578 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_fe184d02-3c3f-423c-af26-eaee4ab40c89/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3589167bbf5d7f5cd80f4f92aa27b7dbe19a0217 [2020-12-09 14:21:12,752 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 14:21:12,768 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 14:21:12,770 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 14:21:12,771 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 14:21:12,772 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 14:21:12,772 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i [2020-12-09 14:21:12,819 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/data/8a3bad98b/ce083ab4d3b64d3eb453994f73cd2d82/FLAG97c951b79 [2020-12-09 14:21:13,242 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 14:21:13,243 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i [2020-12-09 14:21:13,251 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/data/8a3bad98b/ce083ab4d3b64d3eb453994f73cd2d82/FLAG97c951b79 [2020-12-09 14:21:13,264 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/data/8a3bad98b/ce083ab4d3b64d3eb453994f73cd2d82 [2020-12-09 14:21:13,266 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 14:21:13,267 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 14:21:13,268 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 14:21:13,268 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 14:21:13,271 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 14:21:13,271 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39b5aafc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13, skipping insertion in model container [2020-12-09 14:21:13,273 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,279 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 14:21:13,307 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 14:21:13,485 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i[23818,23831] [2020-12-09 14:21:13,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 14:21:13,493 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 14:21:13,523 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i[23818,23831] [2020-12-09 14:21:13,523 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 14:21:13,560 INFO L208 MainTranslator]: Completed translation [2020-12-09 14:21:13,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13 WrapperNode [2020-12-09 14:21:13,560 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 14:21:13,561 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 14:21:13,561 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 14:21:13,561 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 14:21:13,568 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,587 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,612 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 14:21:13,613 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 14:21:13,613 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 14:21:13,613 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 14:21:13,619 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,619 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,621 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,621 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,626 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,629 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,631 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... [2020-12-09 14:21:13,633 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 14:21:13,634 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 14:21:13,634 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 14:21:13,634 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 14:21:13,634 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/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 [2020-12-09 14:21:13,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-09 14:21:13,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-09 14:21:13,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 14:21:13,689 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-09 14:21:13,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 14:21:13,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 14:21:13,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 14:21:13,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 14:21:13,919 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 14:21:13,919 INFO L299 CfgBuilder]: Removed 16 assume(true) statements. [2020-12-09 14:21:13,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 02:21:13 BoogieIcfgContainer [2020-12-09 14:21:13,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 14:21:13,921 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 14:21:13,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 14:21:13,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 14:21:13,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 02:21:13" (1/3) ... [2020-12-09 14:21:13,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3149ca3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 02:21:13, skipping insertion in model container [2020-12-09 14:21:13,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 02:21:13" (2/3) ... [2020-12-09 14:21:13,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3149ca3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 02:21:13, skipping insertion in model container [2020-12-09 14:21:13,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 02:21:13" (3/3) ... [2020-12-09 14:21:13,926 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2020-12-09 14:21:13,935 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 14:21:13,937 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 14:21:13,945 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 14:21:13,961 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 14:21:13,961 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 14:21:13,961 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 14:21:13,962 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 14:21:13,962 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 14:21:13,962 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 14:21:13,962 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 14:21:13,962 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 14:21:13,970 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-12-09 14:21:13,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 14:21:13,973 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:13,974 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:13,974 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:13,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:13,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1354451116, now seen corresponding path program 1 times [2020-12-09 14:21:13,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:13,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109783746] [2020-12-09 14:21:13,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:14,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109783746] [2020-12-09 14:21:14,075 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 14:21:14,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 14:21:14,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347322625] [2020-12-09 14:21:14,078 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-09 14:21:14,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:14,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-09 14:21:14,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 14:21:14,089 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 2 states. [2020-12-09 14:21:14,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:14,099 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2020-12-09 14:21:14,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-09 14:21:14,100 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 7 [2020-12-09 14:21:14,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:14,105 INFO L225 Difference]: With dead ends: 25 [2020-12-09 14:21:14,105 INFO L226 Difference]: Without dead ends: 10 [2020-12-09 14:21:14,107 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 14:21:14,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-09 14:21:14,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-09 14:21:14,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-09 14:21:14,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2020-12-09 14:21:14,134 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2020-12-09 14:21:14,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:14,135 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2020-12-09 14:21:14,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-09 14:21:14,135 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2020-12-09 14:21:14,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 14:21:14,135 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:14,135 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:14,135 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 14:21:14,136 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:14,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:14,136 INFO L82 PathProgramCache]: Analyzing trace with hash -692387256, now seen corresponding path program 1 times [2020-12-09 14:21:14,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:14,137 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775418249] [2020-12-09 14:21:14,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,215 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,215 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775418249] [2020-12-09 14:21:14,215 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 14:21:14,216 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 14:21:14,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022304512] [2020-12-09 14:21:14,217 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 14:21:14,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:14,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 14:21:14,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-09 14:21:14,219 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 4 states. [2020-12-09 14:21:14,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:14,251 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-12-09 14:21:14,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 14:21:14,251 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 8 [2020-12-09 14:21:14,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:14,252 INFO L225 Difference]: With dead ends: 25 [2020-12-09 14:21:14,252 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 14:21:14,253 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-09 14:21:14,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 14:21:14,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2020-12-09 14:21:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 14:21:14,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2020-12-09 14:21:14,257 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2020-12-09 14:21:14,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:14,257 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2020-12-09 14:21:14,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 14:21:14,257 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2020-12-09 14:21:14,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 14:21:14,257 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:14,258 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:14,258 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 14:21:14,258 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:14,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:14,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1416183646, now seen corresponding path program 1 times [2020-12-09 14:21:14,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:14,259 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309267918] [2020-12-09 14:21:14,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:14,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,319 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309267918] [2020-12-09 14:21:14,319 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 14:21:14,320 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 14:21:14,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913732847] [2020-12-09 14:21:14,320 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 14:21:14,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:14,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 14:21:14,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 14:21:14,321 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 5 states. [2020-12-09 14:21:14,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:14,350 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2020-12-09 14:21:14,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 14:21:14,350 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-09 14:21:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:14,351 INFO L225 Difference]: With dead ends: 24 [2020-12-09 14:21:14,351 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 14:21:14,351 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-09 14:21:14,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 14:21:14,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 16. [2020-12-09 14:21:14,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-09 14:21:14,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-12-09 14:21:14,355 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 10 [2020-12-09 14:21:14,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:14,356 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-12-09 14:21:14,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 14:21:14,356 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-12-09 14:21:14,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 14:21:14,356 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:14,356 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:14,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 14:21:14,357 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:14,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:14,357 INFO L82 PathProgramCache]: Analyzing trace with hash 308926872, now seen corresponding path program 1 times [2020-12-09 14:21:14,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:14,358 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704937555] [2020-12-09 14:21:14,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:14,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704937555] [2020-12-09 14:21:14,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458830748] [2020-12-09 14:21:14,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/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 [2020-12-09 14:21:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 14:21:14,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 14:21:14,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 14:21:14,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:14,530 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2020-12-09 14:21:14,530 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 8 [2020-12-09 14:21:14,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934107289] [2020-12-09 14:21:14,531 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 14:21:14,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:14,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 14:21:14,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-12-09 14:21:14,532 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 8 states. [2020-12-09 14:21:14,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:14,594 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-12-09 14:21:14,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 14:21:14,595 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2020-12-09 14:21:14,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:14,595 INFO L225 Difference]: With dead ends: 30 [2020-12-09 14:21:14,596 INFO L226 Difference]: Without dead ends: 25 [2020-12-09 14:21:14,596 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-12-09 14:21:14,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-09 14:21:14,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 17. [2020-12-09 14:21:14,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 14:21:14,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2020-12-09 14:21:14,601 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 10 [2020-12-09 14:21:14,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:14,601 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2020-12-09 14:21:14,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 14:21:14,601 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2020-12-09 14:21:14,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-09 14:21:14,602 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:14,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:14,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 14:21:14,804 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:14,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:14,806 INFO L82 PathProgramCache]: Analyzing trace with hash -953240022, now seen corresponding path program 1 times [2020-12-09 14:21:14,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:14,807 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616715201] [2020-12-09 14:21:14,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:14,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:14,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:14,912 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616715201] [2020-12-09 14:21:14,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659319948] [2020-12-09 14:21:14,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/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 [2020-12-09 14:21:15,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:15,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 14:21:15,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 14:21:15,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:15,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 14:21:15,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:15,101 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141572465] [2020-12-09 14:21:15,115 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 14:21:15,115 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 14:21:15,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 14:21:15,122 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 14:21:15,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 14:21:15,298 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:15,556 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:15,652 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:16,132 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:16,191 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:16,347 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 14:21:16,477 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 55 [2020-12-09 14:21:16,664 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 54 [2020-12-09 14:21:16,961 WARN L197 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 83 [2020-12-09 14:21:17,285 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2020-12-09 14:21:17,286 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 14:21:17,286 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 14:21:17,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2020-12-09 14:21:17,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114149550] [2020-12-09 14:21:17,287 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-09 14:21:17,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:17,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-09 14:21:17,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-12-09 14:21:17,287 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 10 states. [2020-12-09 14:21:17,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:17,350 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-12-09 14:21:17,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 14:21:17,350 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2020-12-09 14:21:17,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:17,351 INFO L225 Difference]: With dead ends: 36 [2020-12-09 14:21:17,351 INFO L226 Difference]: Without dead ends: 31 [2020-12-09 14:21:17,351 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-12-09 14:21:17,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-09 14:21:17,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 16. [2020-12-09 14:21:17,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-09 14:21:17,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-09 14:21:17,354 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-09 14:21:17,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:17,354 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-09 14:21:17,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-09 14:21:17,354 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-09 14:21:17,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-09 14:21:17,355 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:17,355 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:17,555 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 14:21:17,556 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:17,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:17,557 INFO L82 PathProgramCache]: Analyzing trace with hash 626674550, now seen corresponding path program 2 times [2020-12-09 14:21:17,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:17,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655441356] [2020-12-09 14:21:17,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:17,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:17,636 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:17,636 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655441356] [2020-12-09 14:21:17,637 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622294814] [2020-12-09 14:21:17,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 14:21:17,689 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-09 14:21:17,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 14:21:17,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-09 14:21:17,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 14:21:17,761 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:17,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 14:21:17,778 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 14:21:17,779 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271356564] [2020-12-09 14:21:17,781 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 14:21:17,781 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 14:21:17,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 14:21:17,782 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 14:21:17,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 14:21:17,868 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:18,023 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:18,083 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:18,429 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:18,481 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:18,585 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 14:21:19,029 WARN L197 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 83 [2020-12-09 14:21:19,133 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 14:21:19,133 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 14:21:19,133 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 10 [2020-12-09 14:21:19,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652547169] [2020-12-09 14:21:19,134 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-09 14:21:19,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:19,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-09 14:21:19,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2020-12-09 14:21:19,134 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 10 states. [2020-12-09 14:21:19,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:19,219 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-12-09 14:21:19,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 14:21:19,219 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2020-12-09 14:21:19,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:19,220 INFO L225 Difference]: With dead ends: 20 [2020-12-09 14:21:19,220 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 14:21:19,220 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2020-12-09 14:21:19,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 14:21:19,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 14:21:19,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 14:21:19,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-09 14:21:19,222 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-12-09 14:21:19,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:19,223 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-09 14:21:19,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-09 14:21:19,223 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-09 14:21:19,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 14:21:19,223 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:19,223 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:19,423 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2020-12-09 14:21:19,424 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:19,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:19,424 INFO L82 PathProgramCache]: Analyzing trace with hash -2049145386, now seen corresponding path program 3 times [2020-12-09 14:21:19,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:19,424 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149236610] [2020-12-09 14:21:19,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:19,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 14:21:19,498 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-09 14:21:19,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149236610] [2020-12-09 14:21:19,499 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038088565] [2020-12-09 14:21:19,499 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 14:21:19,542 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 14:21:19,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 14:21:19,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-09 14:21:19,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 14:21:19,600 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:19,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 14:21:19,668 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 14:21:19,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304964089] [2020-12-09 14:21:19,670 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 14:21:19,670 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 14:21:19,670 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 14:21:19,670 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 14:21:19,670 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 14:21:19,747 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:19,902 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:19,971 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:20,315 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:20,363 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 14:21:20,463 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 14:21:20,619 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 55 [2020-12-09 14:21:21,045 WARN L197 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 83 [2020-12-09 14:21:21,365 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2020-12-09 14:21:21,365 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 14:21:21,366 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 14:21:21,366 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 10] total 17 [2020-12-09 14:21:21,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094766753] [2020-12-09 14:21:21,366 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-09 14:21:21,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 14:21:21,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-09 14:21:21,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=458, Unknown=0, NotChecked=0, Total=600 [2020-12-09 14:21:21,367 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 18 states. [2020-12-09 14:21:21,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 14:21:21,568 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2020-12-09 14:21:21,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 14:21:21,568 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 16 [2020-12-09 14:21:21,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 14:21:21,568 INFO L225 Difference]: With dead ends: 37 [2020-12-09 14:21:21,568 INFO L226 Difference]: Without dead ends: 34 [2020-12-09 14:21:21,569 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 23 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=246, Invalid=746, Unknown=0, NotChecked=0, Total=992 [2020-12-09 14:21:21,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-09 14:21:21,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-12-09 14:21:21,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-09 14:21:21,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-12-09 14:21:21,573 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2020-12-09 14:21:21,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 14:21:21,573 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-12-09 14:21:21,573 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-09 14:21:21,573 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-12-09 14:21:21,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-09 14:21:21,573 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 14:21:21,573 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 14:21:21,774 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 14:21:21,775 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 14:21:21,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 14:21:21,776 INFO L82 PathProgramCache]: Analyzing trace with hash 899782518, now seen corresponding path program 4 times [2020-12-09 14:21:21,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 14:21:21,776 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653307167] [2020-12-09 14:21:21,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 14:21:21,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 14:21:21,799 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 14:21:21,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 14:21:21,817 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 14:21:21,831 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 14:21:21,831 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 14:21:21,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable168 [2020-12-09 14:21:21,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 02:21:21 BoogieIcfgContainer [2020-12-09 14:21:21,853 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 14:21:21,854 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 14:21:21,854 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 14:21:21,854 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 14:21:21,854 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 02:21:13" (3/4) ... [2020-12-09 14:21:21,855 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 14:21:21,884 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_fe184d02-3c3f-423c-af26-eaee4ab40c89/bin/utaipan/witness.graphml [2020-12-09 14:21:21,884 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 14:21:21,884 INFO L168 Benchmark]: Toolchain (without parser) took 8617.42 ms. Allocated memory was 102.8 MB in the beginning and 218.1 MB in the end (delta: 115.3 MB). Free memory was 72.9 MB in the beginning and 142.3 MB in the end (delta: -69.5 MB). Peak memory consumption was 46.0 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,885 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 102.8 MB. Free memory is still 82.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 14:21:21,885 INFO L168 Benchmark]: CACSL2BoogieTranslator took 292.82 ms. Allocated memory is still 102.8 MB. Free memory was 72.7 MB in the beginning and 50.6 MB in the end (delta: 22.1 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,885 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.26 ms. Allocated memory is still 102.8 MB. Free memory was 50.6 MB in the beginning and 81.5 MB in the end (delta: -30.8 MB). Peak memory consumption was 4.6 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,885 INFO L168 Benchmark]: Boogie Preprocessor took 20.06 ms. Allocated memory is still 102.8 MB. Free memory was 81.5 MB in the beginning and 80.0 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 14:21:21,885 INFO L168 Benchmark]: RCFGBuilder took 286.75 ms. Allocated memory is still 102.8 MB. Free memory was 80.0 MB in the beginning and 55.8 MB in the end (delta: 24.2 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,886 INFO L168 Benchmark]: TraceAbstraction took 7932.22 ms. Allocated memory was 102.8 MB in the beginning and 218.1 MB in the end (delta: 115.3 MB). Free memory was 55.3 MB in the beginning and 145.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 26.7 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,886 INFO L168 Benchmark]: Witness Printer took 30.00 ms. Allocated memory is still 218.1 MB. Free memory was 145.5 MB in the beginning and 142.3 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 14:21:21,887 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 102.8 MB. Free memory is still 82.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 292.82 ms. Allocated memory is still 102.8 MB. Free memory was 72.7 MB in the beginning and 50.6 MB in the end (delta: 22.1 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 51.26 ms. Allocated memory is still 102.8 MB. Free memory was 50.6 MB in the beginning and 81.5 MB in the end (delta: -30.8 MB). Peak memory consumption was 4.6 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.06 ms. Allocated memory is still 102.8 MB. Free memory was 81.5 MB in the beginning and 80.0 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 286.75 ms. Allocated memory is still 102.8 MB. Free memory was 80.0 MB in the beginning and 55.8 MB in the end (delta: 24.2 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 7932.22 ms. Allocated memory was 102.8 MB in the beginning and 218.1 MB in the end (delta: 115.3 MB). Free memory was 55.3 MB in the beginning and 145.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 26.7 MB. Max. memory is 16.1 GB. * Witness Printer took 30.00 ms. Allocated memory is still 218.1 MB. Free memory was 145.5 MB in the beginning and 142.3 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 613]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L603] int len = 2; [L604] len < 32 && __VERIFIER_nondet_int() [L604] len < 32 && __VERIFIER_nondet_int() [L604] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) [L575] SLL head = ((void *)0); [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND FALSE !(len > 0) [L585] return head; [L607] SLL s = sll_create(len + 1); [L588] int len = 0; [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND FALSE !(\read(head)) [L593] return len; [L608] COND TRUE len != sll_length(s) [L613] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.8s, OverallIterations: 8, TraceHistogramMax: 3, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 68 SDtfs, 153 SDslu, 158 SDs, 0 SdLazy, 275 SolverSat, 53 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 193 GetRequests, 101 SyntacticMatches, 7 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=7, 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, 7 MinimizatonAttempts, 41 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 146 NumberOfCodeBlocks, 146 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 166 ConstructedInterpolants, 0 QuantifiedInterpolants, 7165 SizeOfPredicates, 25 NumberOfNonLiveVariables, 470 ConjunctsInSsa, 61 ConjunctsInUnsatCore, 15 InterpolantComputations, 5 PerfectInterpolantSequences, 51/79 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...