./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-pthread/cs_stack-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-pthread/cs_stack-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P --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 0a870e8a4a7dff1b238c9b19b47586f7abd44e3f0eb9969b7dad7bbd7f80e506 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:37:31,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:37:31,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:37:31,527 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:37:31,527 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:37:31,532 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:37:31,534 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:37:31,538 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:37:31,540 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:37:31,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:37:31,549 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:37:31,550 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:37:31,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:37:31,552 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:37:31,553 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:37:31,554 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:37:31,555 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:37:31,556 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:37:31,562 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:37:31,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:37:31,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:37:31,576 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:37:31,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:37:31,584 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:37:31,587 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:37:31,588 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:37:31,588 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:37:31,590 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:37:31,591 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:37:31,592 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:37:31,593 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:37:31,594 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:37:31,596 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:37:31,597 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:37:31,598 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:37:31,598 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:37:31,599 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:37:31,599 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:37:31,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:37:31,600 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:37:31,601 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:37:31,602 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:37:31,651 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:37:31,651 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:37:31,652 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:37:31,652 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:37:31,653 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:37:31,653 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:37:31,653 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:37:31,654 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:37:31,654 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:37:31,654 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:37:31,655 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:37:31,655 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:37:31,655 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:37:31,656 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:37:31,656 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:37:31,656 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:37:31,656 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:37:31,657 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:37:31,657 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:37:31,657 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:37:31,658 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:37:31,658 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:37:31,658 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:37:31,658 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:37:31,658 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:37:31,659 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:37:31,660 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:37:31,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:37:31,661 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:37:31,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:37:31,661 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:37:31,661 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:37:31,662 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:31,662 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:37:31,662 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:37:31,662 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:37:31,662 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:37:31,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:37:31,663 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:37:31,663 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:37:31,663 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:37:31,663 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_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0a870e8a4a7dff1b238c9b19b47586f7abd44e3f0eb9969b7dad7bbd7f80e506 [2021-11-20 23:37:31,948 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:37:31,973 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:37:31,976 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:37:31,977 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:37:31,978 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:37:31,979 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/seq-pthread/cs_stack-2.i [2021-11-20 23:37:32,044 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/data/244dfd899/b060c303369e47e3b5d0853c460d8c03/FLAG0329e36da [2021-11-20 23:37:32,639 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:37:32,640 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/sv-benchmarks/c/seq-pthread/cs_stack-2.i [2021-11-20 23:37:32,660 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/data/244dfd899/b060c303369e47e3b5d0853c460d8c03/FLAG0329e36da [2021-11-20 23:37:32,855 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/data/244dfd899/b060c303369e47e3b5d0853c460d8c03 [2021-11-20 23:37:32,858 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:37:32,859 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:37:32,861 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:32,861 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:37:32,867 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:37:32,868 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:32" (1/1) ... [2021-11-20 23:37:32,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75ebdf2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:32, skipping insertion in model container [2021-11-20 23:37:32,869 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:32" (1/1) ... [2021-11-20 23:37:32,876 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:37:32,931 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:37:33,433 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/sv-benchmarks/c/seq-pthread/cs_stack-2.i[34556,34569] [2021-11-20 23:37:33,556 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:33,580 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:37:33,623 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/sv-benchmarks/c/seq-pthread/cs_stack-2.i[34556,34569] [2021-11-20 23:37:33,696 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:33,757 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:37:33,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33 WrapperNode [2021-11-20 23:37:33,758 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:33,760 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:33,761 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:37:33,761 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:37:33,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,808 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,866 INFO L137 Inliner]: procedures = 252, calls = 270, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 603 [2021-11-20 23:37:33,866 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:33,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:37:33,867 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:37:33,867 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:37:33,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,885 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,885 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,929 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,951 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,971 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,990 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:37:33,991 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:37:33,991 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:37:33,991 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:37:33,992 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (1/1) ... [2021-11-20 23:37:33,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:34,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:34,021 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:37:34,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:37:34,069 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-20 23:37:34,070 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-20 23:37:34,070 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:37:34,070 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_mutex_lock [2021-11-20 23:37:34,070 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_mutex_lock [2021-11-20 23:37:34,070 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-20 23:37:34,071 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:37:34,071 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-20 23:37:34,071 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_mutex_unlock [2021-11-20 23:37:34,071 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_mutex_unlock [2021-11-20 23:37:34,071 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:37:34,071 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:37:34,072 INFO L130 BoogieDeclarations]: Found specification of procedure get_top [2021-11-20 23:37:34,072 INFO L138 BoogieDeclarations]: Found implementation of procedure get_top [2021-11-20 23:37:34,072 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:37:34,072 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-20 23:37:34,072 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_create [2021-11-20 23:37:34,072 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_create [2021-11-20 23:37:34,073 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_join [2021-11-20 23:37:34,073 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_join [2021-11-20 23:37:34,073 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~$Pointer$ [2021-11-20 23:37:34,073 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~$Pointer$ [2021-11-20 23:37:34,073 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-20 23:37:34,073 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-20 23:37:34,074 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_cs [2021-11-20 23:37:34,074 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_cs [2021-11-20 23:37:34,074 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:37:34,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:37:34,075 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:37:34,341 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:37:34,344 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:37:34,413 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##4: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,413 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##3: assume 0 != ~__CS_ret~0 % 256;#res := 0; [2021-11-20 23:37:34,452 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930-1: assume 0 != ~__CS_ret~0 % 256; [2021-11-20 23:37:34,452 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930-1: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,452 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##8: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##9: assume 0 != ~__CS_ret~0 % 256; [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##7: assume 0 != ~__CS_ret~0 % 256; [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##10: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##4: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##3: assume 0 != ~__CS_ret~0 % 256; [2021-11-20 23:37:34,453 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930: SUMMARY for call __CS_cs(); srcloc: null [2021-11-20 23:37:34,796 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##97: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,796 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##96: assume 0 != ~__CS_ret~0 % 256;push_#res#1 := 0; [2021-11-20 23:37:34,796 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##54: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,797 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##53: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-20 23:37:34,797 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##58: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,797 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##57: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-20 23:37:34,797 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##43: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:34,797 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##42: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-20 23:37:34,798 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L1002: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-20 23:37:34,798 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L1002: assume !(0 != ~__CS_ret~0 % 256);pop_#res#1 := 0; [2021-11-20 23:37:34,798 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L986-4: SUMMARY for call __CS_cs(); srcloc: null [2021-11-20 23:37:34,798 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##111: assume 0 != ~__CS_ret~0 % 256;push_#res#1 := 0; [2021-11-20 23:37:34,798 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##112: assume !(0 != ~__CS_ret~0 % 256); [2021-11-20 23:37:37,311 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:37:37,436 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:37:37,437 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:37:37,440 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:37 BoogieIcfgContainer [2021-11-20 23:37:37,440 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:37:37,442 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:37:37,442 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:37:37,446 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:37:37,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:37:32" (1/3) ... [2021-11-20 23:37:37,447 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52472c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:37, skipping insertion in model container [2021-11-20 23:37:37,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:33" (2/3) ... [2021-11-20 23:37:37,448 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52472c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:37, skipping insertion in model container [2021-11-20 23:37:37,448 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:37" (3/3) ... [2021-11-20 23:37:37,450 INFO L111 eAbstractionObserver]: Analyzing ICFG cs_stack-2.i [2021-11-20 23:37:37,456 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:37:37,456 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:37:37,506 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:37:37,513 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:37:37,514 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:37:37,538 INFO L276 IsEmpty]: Start isEmpty. Operand has 196 states, 110 states have (on average 1.4454545454545455) internal successors, (159), 113 states have internal predecessors, (159), 75 states have call successors, (75), 9 states have call predecessors, (75), 9 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) [2021-11-20 23:37:37,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 23:37:37,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:37,559 INFO L514 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:37,560 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:37,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:37,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1915960179, now seen corresponding path program 1 times [2021-11-20 23:37:37,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:37,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913231764] [2021-11-20 23:37:37,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:37,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:37,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:38,102 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-20 23:37:38,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:38,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913231764] [2021-11-20 23:37:38,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913231764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:38,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:38,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:38,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056421139] [2021-11-20 23:37:38,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:38,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:37:38,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:38,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:37:38,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:38,152 INFO L87 Difference]: Start difference. First operand has 196 states, 110 states have (on average 1.4454545454545455) internal successors, (159), 113 states have internal predecessors, (159), 75 states have call successors, (75), 9 states have call predecessors, (75), 9 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 23:37:40,185 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:37:40,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:40,444 INFO L93 Difference]: Finished difference Result 383 states and 609 transitions. [2021-11-20 23:37:40,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:40,446 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) Word has length 65 [2021-11-20 23:37:40,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:40,464 INFO L225 Difference]: With dead ends: 383 [2021-11-20 23:37:40,464 INFO L226 Difference]: Without dead ends: 344 [2021-11-20 23:37:40,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:40,471 INFO L933 BasicCegarLoop]: 361 mSDtfsCounter, 257 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 1004 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:40,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 1004 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-20 23:37:40,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-11-20 23:37:40,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 340. [2021-11-20 23:37:40,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 192 states have (on average 1.46875) internal successors, (282), 196 states have internal predecessors, (282), 131 states have call successors, (131), 17 states have call predecessors, (131), 16 states have return successors, (135), 128 states have call predecessors, (135), 131 states have call successors, (135) [2021-11-20 23:37:40,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 548 transitions. [2021-11-20 23:37:40,603 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 548 transitions. Word has length 65 [2021-11-20 23:37:40,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:40,604 INFO L470 AbstractCegarLoop]: Abstraction has 340 states and 548 transitions. [2021-11-20 23:37:40,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-20 23:37:40,610 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 548 transitions. [2021-11-20 23:37:40,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:37:40,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:40,625 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:40,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:37:40,626 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:40,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:40,630 INFO L85 PathProgramCache]: Analyzing trace with hash -69475204, now seen corresponding path program 1 times [2021-11-20 23:37:40,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:40,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044108250] [2021-11-20 23:37:40,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:40,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:40,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:40,942 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-20 23:37:40,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:40,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044108250] [2021-11-20 23:37:40,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044108250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:40,946 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:40,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:40,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991723946] [2021-11-20 23:37:40,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:40,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:37:40,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:40,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:37:40,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:40,952 INFO L87 Difference]: Start difference. First operand 340 states and 548 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:42,967 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:37:43,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:43,403 INFO L93 Difference]: Finished difference Result 672 states and 1086 transitions. [2021-11-20 23:37:43,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:43,403 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-20 23:37:43,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:43,418 INFO L225 Difference]: With dead ends: 672 [2021-11-20 23:37:43,418 INFO L226 Difference]: Without dead ends: 637 [2021-11-20 23:37:43,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:43,426 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 328 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 44 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:43,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 893 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 112 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-20 23:37:43,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-11-20 23:37:43,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 627. [2021-11-20 23:37:43,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 627 states, 352 states have (on average 1.4744318181818181) internal successors, (519), 363 states have internal predecessors, (519), 243 states have call successors, (243), 30 states have call predecessors, (243), 31 states have return successors, (261), 237 states have call predecessors, (261), 243 states have call successors, (261) [2021-11-20 23:37:43,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 627 states to 627 states and 1023 transitions. [2021-11-20 23:37:43,596 INFO L78 Accepts]: Start accepts. Automaton has 627 states and 1023 transitions. Word has length 123 [2021-11-20 23:37:43,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:43,599 INFO L470 AbstractCegarLoop]: Abstraction has 627 states and 1023 transitions. [2021-11-20 23:37:43,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:43,599 INFO L276 IsEmpty]: Start isEmpty. Operand 627 states and 1023 transitions. [2021-11-20 23:37:43,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:37:43,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:43,620 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:43,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:37:43,620 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:43,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:43,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1085692156, now seen corresponding path program 1 times [2021-11-20 23:37:43,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:43,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076430599] [2021-11-20 23:37:43,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:43,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:43,847 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-20 23:37:43,848 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:43,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076430599] [2021-11-20 23:37:43,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076430599] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:43,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:43,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:43,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731790337] [2021-11-20 23:37:43,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:43,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:37:43,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:43,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:37:43,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:43,854 INFO L87 Difference]: Start difference. First operand 627 states and 1023 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:45,868 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:37:46,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:46,212 INFO L93 Difference]: Finished difference Result 1245 states and 2015 transitions. [2021-11-20 23:37:46,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:46,212 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-20 23:37:46,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:46,219 INFO L225 Difference]: With dead ends: 1245 [2021-11-20 23:37:46,219 INFO L226 Difference]: Without dead ends: 628 [2021-11-20 23:37:46,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:46,225 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 330 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 44 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:46,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 893 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 107 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-20 23:37:46,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-11-20 23:37:46,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 622. [2021-11-20 23:37:46,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 622 states, 349 states have (on average 1.4641833810888252) internal successors, (511), 361 states have internal predecessors, (511), 240 states have call successors, (240), 30 states have call predecessors, (240), 32 states have return successors, (254), 234 states have call predecessors, (254), 240 states have call successors, (254) [2021-11-20 23:37:46,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 622 states to 622 states and 1005 transitions. [2021-11-20 23:37:46,301 INFO L78 Accepts]: Start accepts. Automaton has 622 states and 1005 transitions. Word has length 123 [2021-11-20 23:37:46,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:46,301 INFO L470 AbstractCegarLoop]: Abstraction has 622 states and 1005 transitions. [2021-11-20 23:37:46,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:46,302 INFO L276 IsEmpty]: Start isEmpty. Operand 622 states and 1005 transitions. [2021-11-20 23:37:46,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:37:46,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:46,309 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:46,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:37:46,310 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:46,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:46,311 INFO L85 PathProgramCache]: Analyzing trace with hash 95612746, now seen corresponding path program 1 times [2021-11-20 23:37:46,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:46,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010439415] [2021-11-20 23:37:46,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:46,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:46,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:46,422 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-20 23:37:46,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:46,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010439415] [2021-11-20 23:37:46,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010439415] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:46,424 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:46,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:46,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756049289] [2021-11-20 23:37:46,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:46,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:37:46,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:46,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:37:46,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:46,429 INFO L87 Difference]: Start difference. First operand 622 states and 1005 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:48,446 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:37:48,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:48,953 INFO L93 Difference]: Finished difference Result 971 states and 1540 transitions. [2021-11-20 23:37:48,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:48,957 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-20 23:37:48,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:48,963 INFO L225 Difference]: With dead ends: 971 [2021-11-20 23:37:48,964 INFO L226 Difference]: Without dead ends: 536 [2021-11-20 23:37:48,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:48,971 INFO L933 BasicCegarLoop]: 328 mSDtfsCounter, 378 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 83 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 804 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:48,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 804 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 130 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-20 23:37:48,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-11-20 23:37:49,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 526. [2021-11-20 23:37:49,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 294 states have (on average 1.435374149659864) internal successors, (422), 303 states have internal predecessors, (422), 200 states have call successors, (200), 30 states have call predecessors, (200), 31 states have return successors, (211), 195 states have call predecessors, (211), 200 states have call successors, (211) [2021-11-20 23:37:49,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 833 transitions. [2021-11-20 23:37:49,036 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 833 transitions. Word has length 123 [2021-11-20 23:37:49,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:49,036 INFO L470 AbstractCegarLoop]: Abstraction has 526 states and 833 transitions. [2021-11-20 23:37:49,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-20 23:37:49,037 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 833 transitions. [2021-11-20 23:37:49,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-20 23:37:49,043 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:49,043 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:49,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:37:49,044 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:49,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:49,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1085315085, now seen corresponding path program 1 times [2021-11-20 23:37:49,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:49,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096778359] [2021-11-20 23:37:49,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:49,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:49,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 384 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-20 23:37:50,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:50,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096778359] [2021-11-20 23:37:50,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096778359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:50,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438508208] [2021-11-20 23:37:50,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:50,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:50,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:50,995 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:51,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69a3429c-11c0-42d5-b13c-7b6091943d6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:37:51,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:51,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-20 23:37:51,336 INFO L286 TraceCheckSpWp]: Computing forward predicates...