./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 57096758 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs --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 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ............................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs --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 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-16 02:43:39,430 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 02:43:39,434 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 02:43:39,489 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 02:43:39,490 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 02:43:39,496 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 02:43:39,498 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 02:43:39,503 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 02:43:39,507 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 02:43:39,515 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 02:43:39,516 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 02:43:39,518 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 02:43:39,519 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 02:43:39,522 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 02:43:39,524 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 02:43:39,530 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 02:43:39,532 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 02:43:39,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 02:43:39,535 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 02:43:39,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 02:43:39,548 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 02:43:39,549 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 02:43:39,552 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 02:43:39,554 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 02:43:39,558 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 02:43:39,558 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 02:43:39,559 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 02:43:39,561 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 02:43:39,562 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 02:43:39,563 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 02:43:39,564 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 02:43:39,565 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 02:43:39,567 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 02:43:39,569 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 02:43:39,571 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 02:43:39,571 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 02:43:39,572 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 02:43:39,572 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 02:43:39,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 02:43:39,574 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 02:43:39,574 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 02:43:39,576 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-16 02:43:39,618 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 02:43:39,618 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 02:43:39,620 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 02:43:39,620 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 02:43:39,620 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 02:43:39,621 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 02:43:39,621 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-16 02:43:39,621 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 02:43:39,621 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 02:43:39,622 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-16 02:43:39,623 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-16 02:43:39,623 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 02:43:39,623 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-16 02:43:39,624 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-16 02:43:39,624 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-16 02:43:39,625 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 02:43:39,625 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 02:43:39,625 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-16 02:43:39,625 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 02:43:39,626 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 02:43:39,626 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-16 02:43:39,626 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 02:43:39,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-16 02:43:39,627 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 02:43:39,627 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 02:43:39,627 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-16 02:43:39,627 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 02:43:39,628 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-16 02:43:39,628 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 02:43:39,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 02:43:39,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:43:39,630 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 02:43:39,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 02:43:39,631 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-16 02:43:39,631 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-16 02:43:39,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-16 02:43:39,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-16 02:43:39,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 02:43:39,632 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 02:43:39,632 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_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2021-10-16 02:43:39,990 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 02:43:40,020 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 02:43:40,025 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 02:43:40,026 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 02:43:40,027 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 02:43:40,028 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/loops/string-2.i [2021-10-16 02:43:40,123 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/9bb293215/86df4410fc564ffb9d49eaaa9601d25c/FLAG2bd935440 [2021-10-16 02:43:40,801 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 02:43:40,804 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i [2021-10-16 02:43:40,817 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/9bb293215/86df4410fc564ffb9d49eaaa9601d25c/FLAG2bd935440 [2021-10-16 02:43:41,129 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/9bb293215/86df4410fc564ffb9d49eaaa9601d25c [2021-10-16 02:43:41,132 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 02:43:41,137 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 02:43:41,141 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 02:43:41,142 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 02:43:41,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 02:43:41,148 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,149 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68503f09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41, skipping insertion in model container [2021-10-16 02:43:41,150 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 02:43:41,179 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 02:43:41,398 WARN L228 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_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-16 02:43:41,423 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:43:41,432 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 02:43:41,446 WARN L228 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_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-16 02:43:41,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:43:41,470 INFO L208 MainTranslator]: Completed translation [2021-10-16 02:43:41,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41 WrapperNode [2021-10-16 02:43:41,471 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 02:43:41,472 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 02:43:41,472 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 02:43:41,473 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 02:43:41,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,489 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,511 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 02:43:41,512 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 02:43:41,512 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 02:43:41,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 02:43:41,521 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,524 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,524 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,531 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,537 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,538 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,541 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 02:43:41,542 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 02:43:41,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 02:43:41,542 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 02:43:41,551 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (1/1) ... [2021-10-16 02:43:41,558 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:43:41,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:41,598 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 02:43:41,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 02:43:41,647 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-16 02:43:41,647 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 02:43:41,649 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-16 02:43:41,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 02:43:41,649 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 02:43:41,649 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-16 02:43:41,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-16 02:43:42,116 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 02:43:42,116 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-10-16 02:43:42,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:43:42 BoogieIcfgContainer [2021-10-16 02:43:42,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 02:43:42,122 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 02:43:42,122 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 02:43:42,128 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 02:43:42,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 02:43:41" (1/3) ... [2021-10-16 02:43:42,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2741d2e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:43:42, skipping insertion in model container [2021-10-16 02:43:42,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:41" (2/3) ... [2021-10-16 02:43:42,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2741d2e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:43:42, skipping insertion in model container [2021-10-16 02:43:42,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:43:42" (3/3) ... [2021-10-16 02:43:42,133 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-10-16 02:43:42,140 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 02:43:42,140 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-16 02:43:42,205 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 02:43:42,213 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-16 02:43:42,213 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-16 02:43:42,229 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:42,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-16 02:43:42,236 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:42,237 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:42,238 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:42,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:42,245 INFO L82 PathProgramCache]: Analyzing trace with hash -410377913, now seen corresponding path program 1 times [2021-10-16 02:43:42,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 02:43:42,258 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290086763] [2021-10-16 02:43:42,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:42,259 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 02:43:42,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:42,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:43:42,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 02:43:42,462 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290086763] [2021-10-16 02:43:42,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290086763] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 02:43:42,463 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:43:42,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-16 02:43:42,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275424655] [2021-10-16 02:43:42,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 02:43:42,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 02:43:42,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 02:43:42,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 02:43:42,492 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:42,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:42,541 INFO L93 Difference]: Finished difference Result 43 states and 65 transitions. [2021-10-16 02:43:42,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 02:43:42,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-10-16 02:43:42,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:42,553 INFO L225 Difference]: With dead ends: 43 [2021-10-16 02:43:42,554 INFO L226 Difference]: Without dead ends: 21 [2021-10-16 02:43:42,557 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 02:43:42,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-16 02:43:42,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2021-10-16 02:43:42,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:42,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-10-16 02:43:42,597 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2021-10-16 02:43:42,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:42,598 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-10-16 02:43:42,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:42,598 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-10-16 02:43:42,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-16 02:43:42,599 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:42,600 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:42,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-16 02:43:42,600 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:42,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:42,602 INFO L82 PathProgramCache]: Analyzing trace with hash -650006370, now seen corresponding path program 1 times [2021-10-16 02:43:42,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 02:43:42,602 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993213566] [2021-10-16 02:43:42,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:42,603 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 02:43:42,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:42,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:43:42,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 02:43:42,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993213566] [2021-10-16 02:43:42,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993213566] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 02:43:42,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47322066] [2021-10-16 02:43:42,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:42,664 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:42,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:42,666 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:43:42,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-16 02:43:42,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:42,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-16 02:43:42,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:43:42,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:43,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:43:43,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47322066] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:43,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1611368423] [2021-10-16 02:43:43,123 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-16 02:43:43,124 INFO L166 IcfgInterpreter]: Building call graph [2021-10-16 02:43:43,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-16 02:43:43,140 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-16 02:43:43,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-16 02:43:43,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,235 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 02:43:43,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-10-16 02:43:43,253 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 02:43:43,254 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-10-16 02:43:43,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 158 [2021-10-16 02:43:43,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:43:43,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:43:43,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:43:43,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:43:43,458 INFO L354 Elim1Store]: treesize reduction 141, result has 10.2 percent of original size [2021-10-16 02:43:43,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 12 case distinctions, treesize of input 63 treesize of output 62 [2021-10-16 02:43:43,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,471 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 50 [2021-10-16 02:43:43,479 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 50 [2021-10-16 02:43:43,484 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-16 02:43:43,486 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-16 02:43:43,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,576 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:43:43,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 136 [2021-10-16 02:43:43,580 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-16 02:43:43,581 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:155, output treesize:136 [2021-10-16 02:43:43,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:43,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:43,797 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#length_13| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-16 02:43:43,801 INFO L168 Benchmark]: Toolchain (without parser) took 2666.55 ms. Allocated memory was 86.0 MB in the beginning and 119.5 MB in the end (delta: 33.6 MB). Free memory was 49.1 MB in the beginning and 86.6 MB in the end (delta: -37.5 MB). Peak memory consumption was 26.4 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:43,802 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 86.0 MB. Free memory was 65.2 MB in the beginning and 65.1 MB in the end (delta: 69.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:43:43,803 INFO L168 Benchmark]: CACSL2BoogieTranslator took 330.35 ms. Allocated memory is still 86.0 MB. Free memory was 48.9 MB in the beginning and 58.0 MB in the end (delta: -9.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:43,803 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.41 ms. Allocated memory is still 86.0 MB. Free memory was 57.7 MB in the beginning and 56.2 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:43:43,804 INFO L168 Benchmark]: Boogie Preprocessor took 28.86 ms. Allocated memory is still 86.0 MB. Free memory was 56.2 MB in the beginning and 54.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:43,805 INFO L168 Benchmark]: RCFGBuilder took 577.70 ms. Allocated memory is still 86.0 MB. Free memory was 54.7 MB in the beginning and 40.3 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:43,807 INFO L168 Benchmark]: TraceAbstraction took 1678.34 ms. Allocated memory was 86.0 MB in the beginning and 119.5 MB in the end (delta: 33.6 MB). Free memory was 40.0 MB in the beginning and 86.6 MB in the end (delta: -46.6 MB). Peak memory consumption was 18.6 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:43,811 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 86.0 MB. Free memory was 65.2 MB in the beginning and 65.1 MB in the end (delta: 69.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 330.35 ms. Allocated memory is still 86.0 MB. Free memory was 48.9 MB in the beginning and 58.0 MB in the end (delta: -9.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.41 ms. Allocated memory is still 86.0 MB. Free memory was 57.7 MB in the beginning and 56.2 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.86 ms. Allocated memory is still 86.0 MB. Free memory was 56.2 MB in the beginning and 54.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 577.70 ms. Allocated memory is still 86.0 MB. Free memory was 54.7 MB in the beginning and 40.3 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1678.34 ms. Allocated memory was 86.0 MB in the beginning and 119.5 MB in the end (delta: 33.6 MB). Free memory was 40.0 MB in the beginning and 86.6 MB in the end (delta: -46.6 MB). Peak memory consumption was 18.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#length_13| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#length_13|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-16 02:43:43,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-5709675 [2021-10-16 02:43:46,543 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 02:43:46,546 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 02:43:46,611 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 02:43:46,612 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 02:43:46,617 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 02:43:46,619 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 02:43:46,624 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 02:43:46,628 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 02:43:46,638 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 02:43:46,640 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 02:43:46,642 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 02:43:46,643 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 02:43:46,645 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 02:43:46,647 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 02:43:46,653 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 02:43:46,654 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 02:43:46,655 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 02:43:46,657 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 02:43:46,659 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 02:43:46,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 02:43:46,663 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 02:43:46,664 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 02:43:46,665 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 02:43:46,669 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 02:43:46,669 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 02:43:46,670 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 02:43:46,671 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 02:43:46,672 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 02:43:46,673 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 02:43:46,673 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 02:43:46,674 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 02:43:46,675 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 02:43:46,676 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 02:43:46,677 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 02:43:46,678 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 02:43:46,678 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 02:43:46,679 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 02:43:46,679 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 02:43:46,680 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 02:43:46,681 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 02:43:46,682 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-16 02:43:46,705 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 02:43:46,706 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 02:43:46,707 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 02:43:46,707 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 02:43:46,707 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 02:43:46,707 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 02:43:46,708 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 02:43:46,708 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 02:43:46,708 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 02:43:46,709 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 02:43:46,709 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 02:43:46,709 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 02:43:46,710 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 02:43:46,710 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-16 02:43:46,710 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 02:43:46,710 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-16 02:43:46,711 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 02:43:46,711 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-16 02:43:46,711 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-16 02:43:46,711 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 02:43:46,712 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-16 02:43:46,712 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 02:43:46,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-16 02:43:46,712 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 02:43:46,713 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-16 02:43:46,713 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 02:43:46,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:43:46,713 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 02:43:46,714 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 02:43:46,714 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-16 02:43:46,714 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-16 02:43:46,714 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-16 02:43:46,715 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-16 02:43:46,715 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 02:43:46,715 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 02:43:46,715 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2021-10-16 02:43:47,115 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 02:43:47,142 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 02:43:47,146 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 02:43:47,148 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 02:43:47,149 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 02:43:47,152 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/loops/string-2.i [2021-10-16 02:43:47,245 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/c389d3f11/a884853e4be74b8083956f466ff33904/FLAGfc80e2db6 [2021-10-16 02:43:47,922 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 02:43:47,924 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i [2021-10-16 02:43:47,936 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/c389d3f11/a884853e4be74b8083956f466ff33904/FLAGfc80e2db6 [2021-10-16 02:43:48,254 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/data/c389d3f11/a884853e4be74b8083956f466ff33904 [2021-10-16 02:43:48,257 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 02:43:48,259 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 02:43:48,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 02:43:48,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 02:43:48,265 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 02:43:48,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,268 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25b62bc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48, skipping insertion in model container [2021-10-16 02:43:48,268 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,277 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 02:43:48,296 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 02:43:48,462 WARN L228 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_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-16 02:43:48,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:43:48,509 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 02:43:48,529 WARN L228 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_4e7b586d-1e33-4049-bab6-aaaeda037900/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-16 02:43:48,563 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:43:48,628 INFO L208 MainTranslator]: Completed translation [2021-10-16 02:43:48,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48 WrapperNode [2021-10-16 02:43:48,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 02:43:48,630 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 02:43:48,630 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 02:43:48,631 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 02:43:48,639 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,661 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,699 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 02:43:48,700 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 02:43:48,700 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 02:43:48,701 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 02:43:48,710 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,710 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,719 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,720 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,745 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,750 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,752 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 02:43:48,756 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 02:43:48,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 02:43:48,756 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 02:43:48,757 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (1/1) ... [2021-10-16 02:43:48,768 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:43:48,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:48,800 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 02:43:48,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 02:43:48,866 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-16 02:43:48,866 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-16 02:43:48,867 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 02:43:48,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 02:43:48,867 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 02:43:48,867 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-16 02:43:48,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-16 02:43:49,198 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 02:43:49,198 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-10-16 02:43:49,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:43:49 BoogieIcfgContainer [2021-10-16 02:43:49,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 02:43:49,203 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 02:43:49,203 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 02:43:49,207 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 02:43:49,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 02:43:48" (1/3) ... [2021-10-16 02:43:49,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f2a5589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:43:49, skipping insertion in model container [2021-10-16 02:43:49,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:43:48" (2/3) ... [2021-10-16 02:43:49,222 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f2a5589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:43:49, skipping insertion in model container [2021-10-16 02:43:49,222 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:43:49" (3/3) ... [2021-10-16 02:43:49,224 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-10-16 02:43:49,261 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 02:43:49,261 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-16 02:43:49,369 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 02:43:49,385 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-16 02:43:49,385 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-16 02:43:49,420 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:49,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-16 02:43:49,427 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:49,428 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:49,428 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:49,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:49,444 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2021-10-16 02:43:49,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:49,461 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1070172412] [2021-10-16 02:43:49,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:49,464 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:49,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:49,470 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:49,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-16 02:43:49,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:49,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2021-10-16 02:43:49,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:49,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:43:49,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:49,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:43:49,855 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:43:49,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1070172412] [2021-10-16 02:43:49,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1070172412] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:43:49,857 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:43:49,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-16 02:43:49,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323705655] [2021-10-16 02:43:49,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-16 02:43:49,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:43:49,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-16 02:43:49,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-16 02:43:49,896 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:49,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:49,922 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2021-10-16 02:43:49,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-16 02:43:49,926 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-10-16 02:43:49,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:49,936 INFO L225 Difference]: With dead ends: 48 [2021-10-16 02:43:49,937 INFO L226 Difference]: Without dead ends: 22 [2021-10-16 02:43:49,940 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-16 02:43:49,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-10-16 02:43:49,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-10-16 02:43:49,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:49,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-10-16 02:43:49,986 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-10-16 02:43:49,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:49,987 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-10-16 02:43:49,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:49,989 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-10-16 02:43:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-16 02:43:49,991 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:49,991 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:50,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:50,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:43:50,205 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:50,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:50,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2021-10-16 02:43:50,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:50,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2017397512] [2021-10-16 02:43:50,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:50,208 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:50,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:50,211 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:50,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-16 02:43:50,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:50,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-16 02:43:50,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:50,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:43:50,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:50,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:43:50,474 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:43:50,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2017397512] [2021-10-16 02:43:50,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2017397512] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:43:50,475 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:43:50,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-10-16 02:43:50,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187368003] [2021-10-16 02:43:50,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-16 02:43:50,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:43:50,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-16 02:43:50,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-16 02:43:50,480 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:50,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:50,607 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2021-10-16 02:43:50,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-16 02:43:50,609 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-10-16 02:43:50,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:50,612 INFO L225 Difference]: With dead ends: 58 [2021-10-16 02:43:50,613 INFO L226 Difference]: Without dead ends: 40 [2021-10-16 02:43:50,615 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.8ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-16 02:43:50,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-10-16 02:43:50,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 28. [2021-10-16 02:43:50,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:50,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-10-16 02:43:50,641 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 18 [2021-10-16 02:43:50,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:50,642 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-10-16 02:43:50,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:50,644 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-10-16 02:43:50,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-10-16 02:43:50,647 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:50,648 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:50,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-10-16 02:43:50,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:43:50,854 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:50,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:50,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 1 times [2021-10-16 02:43:50,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:50,856 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [703680744] [2021-10-16 02:43:50,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:50,857 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:50,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:50,859 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:50,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-16 02:43:50,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:50,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:50,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:51,116 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:43:51,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:51,268 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:43:51,269 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:43:51,269 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [703680744] [2021-10-16 02:43:51,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [703680744] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:51,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1843739108] [2021-10-16 02:43:51,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:51,271 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:43:51,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:43:51,278 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:43:51,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-16 02:43:51,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:51,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:51,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:51,609 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:43:51,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:43:51,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1843739108] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:51,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519475534] [2021-10-16 02:43:51,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:51,751 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:51,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:51,782 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:43:51,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-16 02:43:51,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:51,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:43:51,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:52,176 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-16 02:43:52,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:52,435 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-16 02:43:52,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519475534] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:43:52,437 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-16 02:43:52,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5, 5, 5] total 13 [2021-10-16 02:43:52,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287015793] [2021-10-16 02:43:52,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-16 02:43:52,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:43:52,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-16 02:43:52,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-10-16 02:43:52,443 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:52,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:52,774 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2021-10-16 02:43:52,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 02:43:52,775 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-10-16 02:43:52,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:52,776 INFO L225 Difference]: With dead ends: 43 [2021-10-16 02:43:52,776 INFO L226 Difference]: Without dead ends: 31 [2021-10-16 02:43:52,777 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 250.0ms TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-10-16 02:43:52,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-10-16 02:43:52,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-10-16 02:43:52,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:52,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-10-16 02:43:52,784 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 26 [2021-10-16 02:43:52,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:52,785 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-10-16 02:43:52,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:52,786 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-10-16 02:43:52,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-16 02:43:52,787 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:52,787 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:52,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:53,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:53,214 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-10-16 02:43:53,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 02:43:53,410 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:53,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:53,411 INFO L82 PathProgramCache]: Analyzing trace with hash 2056002324, now seen corresponding path program 1 times [2021-10-16 02:43:53,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:53,412 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [587054352] [2021-10-16 02:43:53,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:53,412 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:53,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:53,414 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:53,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-16 02:43:53,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:53,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:53,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:53,680 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:43:53,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:53,828 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:43:53,828 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:43:53,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [587054352] [2021-10-16 02:43:53,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [587054352] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:53,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194203127] [2021-10-16 02:43:53,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:53,832 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:43:53,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:43:53,838 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:43:53,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-10-16 02:43:54,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:54,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:54,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:54,172 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:43:54,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:43:54,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194203127] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:54,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039517665] [2021-10-16 02:43:54,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:54,277 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:54,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:54,278 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:43:54,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-16 02:43:54,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:54,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:54,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:54,613 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-16 02:43:54,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:54,732 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-16 02:43:54,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039517665] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:43:54,733 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-16 02:43:54,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5, 5, 5] total 12 [2021-10-16 02:43:54,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689273862] [2021-10-16 02:43:54,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-16 02:43:54,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:43:54,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-16 02:43:54,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-10-16 02:43:54,735 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:54,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:54,812 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2021-10-16 02:43:54,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-16 02:43:54,814 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-10-16 02:43:54,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:54,815 INFO L225 Difference]: With dead ends: 46 [2021-10-16 02:43:54,815 INFO L226 Difference]: Without dead ends: 33 [2021-10-16 02:43:54,815 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-10-16 02:43:54,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-10-16 02:43:54,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-10-16 02:43:54,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:54,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-10-16 02:43:54,822 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 30 [2021-10-16 02:43:54,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:54,823 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-10-16 02:43:54,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:54,823 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-10-16 02:43:54,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-16 02:43:54,825 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:54,825 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:54,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:55,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:55,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:55,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:43:55,442 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:55,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:55,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1910701689, now seen corresponding path program 1 times [2021-10-16 02:43:55,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:55,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [628045800] [2021-10-16 02:43:55,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:55,444 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:55,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:55,446 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:55,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-10-16 02:43:55,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:55,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:55,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:55,773 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:55,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:55,928 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:55,928 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:43:55,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [628045800] [2021-10-16 02:43:55,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [628045800] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:55,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1668036910] [2021-10-16 02:43:55,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:55,929 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:43:55,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:43:55,934 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:43:55,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-10-16 02:43:56,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:56,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:56,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:56,306 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:56,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:56,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1668036910] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:56,419 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460153967] [2021-10-16 02:43:56,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:43:56,422 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:56,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:43:56,426 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:43:56,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-16 02:43:56,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:43:56,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:43:56,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:43:56,787 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:56,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:43:56,912 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:43:56,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460153967] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:43:56,912 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:43:56,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-10-16 02:43:56,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061544503] [2021-10-16 02:43:56,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-16 02:43:56,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:43:56,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-16 02:43:56,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-16 02:43:56,917 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:57,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:43:57,201 INFO L93 Difference]: Finished difference Result 96 states and 116 transitions. [2021-10-16 02:43:57,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 02:43:57,202 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-10-16 02:43:57,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:43:57,203 INFO L225 Difference]: With dead ends: 96 [2021-10-16 02:43:57,203 INFO L226 Difference]: Without dead ends: 70 [2021-10-16 02:43:57,204 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-10-16 02:43:57,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-10-16 02:43:57,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 45. [2021-10-16 02:43:57,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 44 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:57,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-10-16 02:43:57,213 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 32 [2021-10-16 02:43:57,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:43:57,213 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-10-16 02:43:57,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 02:43:57,214 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-10-16 02:43:57,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-16 02:43:57,215 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:43:57,215 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:43:57,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:57,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:57,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-10-16 02:43:57,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:43:57,817 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:43:57,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:43:57,817 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 2 times [2021-10-16 02:43:57,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:43:57,818 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1886700653] [2021-10-16 02:43:57,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:43:57,818 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:43:57,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:43:57,819 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:43:57,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-10-16 02:43:58,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:43:58,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-16 02:43:58,141 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-16 02:43:58,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-16 02:43:58,348 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-16 02:43:58,349 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-16 02:43:58,350 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-16 02:43:58,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-10-16 02:43:58,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:43:58,567 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-16 02:43:58,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.10 02:43:58 BoogieIcfgContainer [2021-10-16 02:43:58,620 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-16 02:43:58,620 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-16 02:43:58,620 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-16 02:43:58,621 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-16 02:43:58,621 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:43:49" (3/4) ... [2021-10-16 02:43:58,623 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-16 02:43:58,691 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e7b586d-1e33-4049-bab6-aaaeda037900/bin/utaipan-mTDlp9Zugs/witness.graphml [2021-10-16 02:43:58,691 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-16 02:43:58,693 INFO L168 Benchmark]: Toolchain (without parser) took 10433.24 ms. Allocated memory was 60.8 MB in the beginning and 107.0 MB in the end (delta: 46.1 MB). Free memory was 38.2 MB in the beginning and 41.5 MB in the end (delta: -3.3 MB). Peak memory consumption was 42.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:58,694 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 60.8 MB. Free memory is still 41.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:43:58,694 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.98 ms. Allocated memory is still 60.8 MB. Free memory was 37.9 MB in the beginning and 43.4 MB in the end (delta: -5.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:58,695 INFO L168 Benchmark]: Boogie Procedure Inliner took 68.94 ms. Allocated memory is still 60.8 MB. Free memory was 43.4 MB in the beginning and 41.8 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:43:58,696 INFO L168 Benchmark]: Boogie Preprocessor took 54.94 ms. Allocated memory is still 60.8 MB. Free memory was 41.8 MB in the beginning and 40.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:43:58,696 INFO L168 Benchmark]: RCFGBuilder took 445.35 ms. Allocated memory is still 60.8 MB. Free memory was 40.2 MB in the beginning and 28.5 MB in the end (delta: 11.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:58,697 INFO L168 Benchmark]: TraceAbstraction took 9416.61 ms. Allocated memory was 60.8 MB in the beginning and 107.0 MB in the end (delta: 46.1 MB). Free memory was 27.9 MB in the beginning and 44.5 MB in the end (delta: -16.6 MB). Peak memory consumption was 32.3 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:58,697 INFO L168 Benchmark]: Witness Printer took 71.30 ms. Allocated memory is still 107.0 MB. Free memory was 44.5 MB in the beginning and 41.5 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:43:58,701 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 60.8 MB. Free memory is still 41.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 367.98 ms. Allocated memory is still 60.8 MB. Free memory was 37.9 MB in the beginning and 43.4 MB in the end (delta: -5.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 68.94 ms. Allocated memory is still 60.8 MB. Free memory was 43.4 MB in the beginning and 41.8 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 54.94 ms. Allocated memory is still 60.8 MB. Free memory was 41.8 MB in the beginning and 40.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 445.35 ms. Allocated memory is still 60.8 MB. Free memory was 40.2 MB in the beginning and 28.5 MB in the end (delta: 11.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9416.61 ms. Allocated memory was 60.8 MB in the beginning and 107.0 MB in the end (delta: 46.1 MB). Free memory was 27.9 MB in the beginning and 44.5 MB in the end (delta: -16.6 MB). Peak memory consumption was 32.3 MB. Max. memory is 16.1 GB. * Witness Printer took 71.30 ms. Allocated memory is still 107.0 MB. Free memory was 44.5 MB in the beginning and 41.5 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 20]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND TRUE string_A[nc_A]!='\0' [L45] nc_A++ [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND TRUE string_B[nc_B]!='\0' [L49] nc_B++ [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND TRUE (inc_B-1)<