./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/rev-3-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/rev-3-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8 --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 4a05bdadad077833bc2e17446c15598150f193fe .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/rev-3-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8 --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 4a05bdadad077833bc2e17446c15598150f193fe .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: AssertionError: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) Received EOF on stdin. stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:32:05,300 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:32:05,303 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:32:05,367 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:32:05,368 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:32:05,375 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:32:05,379 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:32:05,382 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:32:05,384 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:32:05,386 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:32:05,387 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:32:05,389 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:32:05,390 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:32:05,391 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:32:05,393 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:32:05,395 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:32:05,396 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:32:05,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:32:05,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:32:05,403 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:32:05,406 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:32:05,408 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:32:05,409 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:32:05,411 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:32:05,416 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:32:05,416 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:32:05,417 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:32:05,418 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:32:05,419 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:32:05,420 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:32:05,421 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:32:05,422 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:32:05,423 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:32:05,424 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:32:05,430 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:32:05,431 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:32:05,432 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:32:05,432 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:32:05,433 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:32:05,434 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:32:05,435 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:32:05,439 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-13 07:32:05,502 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:32:05,502 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:32:05,503 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:32:05,504 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:32:05,504 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:32:05,504 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:32:05,505 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 07:32:05,505 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:32:05,516 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:32:05,516 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 07:32:05,517 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 07:32:05,518 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:32:05,518 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 07:32:05,518 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 07:32:05,519 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 07:32:05,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:32:05,520 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:32:05,520 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:32:05,520 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:32:05,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:32:05,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 07:32:05,521 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:32:05,521 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 07:32:05,525 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:32:05,525 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:32:05,526 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 07:32:05,526 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:32:05,526 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 07:32:05,527 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:32:05,529 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:32:05,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:32:05,530 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:32:05,530 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:32:05,531 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 07:32:05,531 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 07:32:05,531 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 07:32:05,531 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 07:32:05,532 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:32:05,532 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:32:05,532 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a05bdadad077833bc2e17446c15598150f193fe [2021-10-13 07:32:05,891 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:32:05,944 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:32:05,947 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:32:05,949 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:32:05,954 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:32:05,955 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-multidimensional/rev-3-u.c [2021-10-13 07:32:06,070 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/026e3ef72/da40b7c0131a431cb0b77bf0d0d4163e/FLAG3244a9099 [2021-10-13 07:32:06,673 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:32:06,674 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c [2021-10-13 07:32:06,685 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/026e3ef72/da40b7c0131a431cb0b77bf0d0d4163e/FLAG3244a9099 [2021-10-13 07:32:07,036 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/026e3ef72/da40b7c0131a431cb0b77bf0d0d4163e [2021-10-13 07:32:07,039 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:32:07,041 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:32:07,058 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:32:07,058 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:32:07,062 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:32:07,063 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,065 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@292e3bea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07, skipping insertion in model container [2021-10-13 07:32:07,065 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,075 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:32:07,097 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:32:07,288 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2021-10-13 07:32:07,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:32:07,322 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:32:07,336 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2021-10-13 07:32:07,352 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:32:07,367 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:32:07,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07 WrapperNode [2021-10-13 07:32:07,368 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:32:07,370 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:32:07,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:32:07,370 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:32:07,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,399 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,426 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:32:07,427 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:32:07,427 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:32:07,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:32:07,437 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,438 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,440 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,441 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,448 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,455 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,457 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:32:07,461 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:32:07,461 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:32:07,462 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:32:07,469 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (1/1) ... [2021-10-13 07:32:07,478 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:32:07,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:07,505 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:32:07,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:32:07,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 07:32:07,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:32:07,572 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 07:32:07,572 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:32:07,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:32:07,573 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 07:32:07,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:32:08,194 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:32:08,195 INFO L299 CfgBuilder]: Removed 15 assume(true) statements. [2021-10-13 07:32:08,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:32:08 BoogieIcfgContainer [2021-10-13 07:32:08,198 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:32:08,200 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:32:08,200 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:32:08,219 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:32:08,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:32:07" (1/3) ... [2021-10-13 07:32:08,220 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21e13f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:32:08, skipping insertion in model container [2021-10-13 07:32:08,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:07" (2/3) ... [2021-10-13 07:32:08,221 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21e13f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:32:08, skipping insertion in model container [2021-10-13 07:32:08,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:32:08" (3/3) ... [2021-10-13 07:32:08,223 INFO L111 eAbstractionObserver]: Analyzing ICFG rev-3-u.c [2021-10-13 07:32:08,229 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:32:08,234 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 07:32:08,301 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:32:08,308 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 [2021-10-13 07:32:08,309 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 07:32:08,325 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 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) [2021-10-13 07:32:08,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:32:08,332 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:08,332 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:08,333 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:08,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:08,347 INFO L82 PathProgramCache]: Analyzing trace with hash -2111892288, now seen corresponding path program 1 times [2021-10-13 07:32:08,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:32:08,357 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174321962] [2021-10-13 07:32:08,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:08,359 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:32:08,447 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-13 07:32:08,448 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1951601554] [2021-10-13 07:32:08,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:08,449 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:08,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:08,451 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:08,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 07:32:08,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:08,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:08,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:08,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:08,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:08,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:08,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:32:08,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174321962] [2021-10-13 07:32:08,693 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-13 07:32:08,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951601554] [2021-10-13 07:32:08,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951601554] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:08,695 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:08,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-10-13 07:32:08,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528086900] [2021-10-13 07:32:08,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:32:08,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:32:08,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:32:08,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:32:08,726 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:08,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:08,794 INFO L93 Difference]: Finished difference Result 30 states and 49 transitions. [2021-10-13 07:32:08,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:32:08,796 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-10-13 07:32:08,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:08,804 INFO L225 Difference]: With dead ends: 30 [2021-10-13 07:32:08,805 INFO L226 Difference]: Without dead ends: 18 [2021-10-13 07:32:08,808 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.9ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:32:08,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-10-13 07:32:08,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-10-13 07:32:08,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.6470588235294117) 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) [2021-10-13 07:32:08,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 28 transitions. [2021-10-13 07:32:08,846 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 28 transitions. Word has length 8 [2021-10-13 07:32:08,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:08,847 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 28 transitions. [2021-10-13 07:32:08,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:08,847 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 28 transitions. [2021-10-13 07:32:08,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 07:32:08,848 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:08,849 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:08,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:09,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-10-13 07:32:09,074 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:09,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:09,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1505015266, now seen corresponding path program 1 times [2021-10-13 07:32:09,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:32:09,075 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158141541] [2021-10-13 07:32:09,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:09,076 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:32:09,084 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-13 07:32:09,084 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [984502598] [2021-10-13 07:32:09,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:09,085 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:09,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:09,102 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:09,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-13 07:32:09,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:09,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:09,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:32:09,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:09,370 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:32:09,370 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:32:09,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158141541] [2021-10-13 07:32:09,371 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-13 07:32:09,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984502598] [2021-10-13 07:32:09,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984502598] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:09,372 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:09,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:32:09,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575133306] [2021-10-13 07:32:09,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:32:09,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:32:09,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:32:09,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:32:09,377 INFO L87 Difference]: Start difference. First operand 18 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:09,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:09,567 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2021-10-13 07:32:09,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:32:09,568 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-10-13 07:32:09,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:09,569 INFO L225 Difference]: With dead ends: 50 [2021-10-13 07:32:09,569 INFO L226 Difference]: Without dead ends: 36 [2021-10-13 07:32:09,571 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-13 07:32:09,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-10-13 07:32:09,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2021-10-13 07:32:09,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 31 states have internal predecessors, (47), 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) [2021-10-13 07:32:09,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 47 transitions. [2021-10-13 07:32:09,595 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 47 transitions. Word has length 12 [2021-10-13 07:32:09,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:09,596 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 47 transitions. [2021-10-13 07:32:09,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:09,596 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2021-10-13 07:32:09,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-13 07:32:09,598 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:09,598 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:09,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:09,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:09,799 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:09,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:09,800 INFO L82 PathProgramCache]: Analyzing trace with hash 2122031210, now seen corresponding path program 1 times [2021-10-13 07:32:09,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:32:09,802 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920741463] [2021-10-13 07:32:09,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:09,802 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:32:09,813 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-13 07:32:09,813 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [716835187] [2021-10-13 07:32:09,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:09,814 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:09,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:09,816 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:09,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-13 07:32:09,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:09,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:09,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:10,084 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-10-13 07:32:10,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:10,196 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-10-13 07:32:10,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:32:10,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920741463] [2021-10-13 07:32:10,197 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-13 07:32:10,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716835187] [2021-10-13 07:32:10,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716835187] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:10,199 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:10,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:32:10,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997906966] [2021-10-13 07:32:10,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:32:10,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:32:10,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:32:10,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:32:10,210 INFO L87 Difference]: Start difference. First operand 32 states and 47 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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) [2021-10-13 07:32:10,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:10,384 INFO L93 Difference]: Finished difference Result 84 states and 131 transitions. [2021-10-13 07:32:10,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:32:10,385 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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 20 [2021-10-13 07:32:10,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:10,390 INFO L225 Difference]: With dead ends: 84 [2021-10-13 07:32:10,390 INFO L226 Difference]: Without dead ends: 56 [2021-10-13 07:32:10,391 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 31.5ms TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-13 07:32:10,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-10-13 07:32:10,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2021-10-13 07:32:10,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 51 states have internal predecessors, (69), 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) [2021-10-13 07:32:10,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 69 transitions. [2021-10-13 07:32:10,426 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 69 transitions. Word has length 20 [2021-10-13 07:32:10,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:10,429 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 69 transitions. [2021-10-13 07:32:10,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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) [2021-10-13 07:32:10,429 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 69 transitions. [2021-10-13 07:32:10,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-10-13 07:32:10,431 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:10,431 INFO L512 BasicCegarLoop]: trace histogram [8, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:10,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:10,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:10,632 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:10,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:10,633 INFO L82 PathProgramCache]: Analyzing trace with hash -207536790, now seen corresponding path program 1 times [2021-10-13 07:32:10,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:32:10,633 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477510800] [2021-10-13 07:32:10,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:10,634 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:32:10,643 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-13 07:32:10,643 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1953187481] [2021-10-13 07:32:10,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:10,644 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:10,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:10,645 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:10,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-13 07:32:10,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:10,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:10,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:10,921 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-10-13 07:32:10,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:11,025 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-10-13 07:32:11,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:32:11,026 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477510800] [2021-10-13 07:32:11,026 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-13 07:32:11,026 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953187481] [2021-10-13 07:32:11,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953187481] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:11,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871731164] [2021-10-13 07:32:11,052 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-10-13 07:32:11,052 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 07:32:11,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 07:32:11,064 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 07:32:11,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 07:32:11,107 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,113 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:32:11,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-10-13 07:32:11,121 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:32:11,122 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,124 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-13 07:32:11,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 212 [2021-10-13 07:32:11,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:32:11,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:32:11,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:32:11,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:32:11,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:32:11,391 INFO L354 Elim1Store]: treesize reduction 244, result has 7.9 percent of original size [2021-10-13 07:32:11,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 18 case distinctions, treesize of input 87 treesize of output 86 [2021-10-13 07:32:11,400 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-10-13 07:32:11,409 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,411 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-10-13 07:32:11,412 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 07:32:11,414 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 07:32:11,565 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,572 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:32:11,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 188 [2021-10-13 07:32:11,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 07:32:11,585 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:209, output treesize:188 [2021-10-13 07:32:11,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:11,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:11,800 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_14| 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) [2021-10-13 07:32:11,804 INFO L168 Benchmark]: Toolchain (without parser) took 4762.47 ms. Allocated memory was 98.6 MB in the beginning and 132.1 MB in the end (delta: 33.6 MB). Free memory was 63.2 MB in the beginning and 64.4 MB in the end (delta: -1.2 MB). Peak memory consumption was 32.2 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,805 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 98.6 MB. Free memory was 67.5 MB in the beginning and 67.5 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:32:11,805 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.01 ms. Allocated memory is still 98.6 MB. Free memory was 62.9 MB in the beginning and 73.3 MB in the end (delta: -10.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,806 INFO L168 Benchmark]: Boogie Procedure Inliner took 56.33 ms. Allocated memory is still 98.6 MB. Free memory was 73.3 MB in the beginning and 71.5 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,807 INFO L168 Benchmark]: Boogie Preprocessor took 33.61 ms. Allocated memory is still 98.6 MB. Free memory was 71.5 MB in the beginning and 70.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,807 INFO L168 Benchmark]: RCFGBuilder took 736.66 ms. Allocated memory is still 98.6 MB. Free memory was 70.3 MB in the beginning and 55.2 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,808 INFO L168 Benchmark]: TraceAbstraction took 3602.91 ms. Allocated memory was 98.6 MB in the beginning and 132.1 MB in the end (delta: 33.6 MB). Free memory was 54.7 MB in the beginning and 64.4 MB in the end (delta: -9.7 MB). Peak memory consumption was 26.7 MB. Max. memory is 16.1 GB. [2021-10-13 07:32:11,812 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 98.6 MB. Free memory was 67.5 MB in the beginning and 67.5 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 311.01 ms. Allocated memory is still 98.6 MB. Free memory was 62.9 MB in the beginning and 73.3 MB in the end (delta: -10.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 56.33 ms. Allocated memory is still 98.6 MB. Free memory was 73.3 MB in the beginning and 71.5 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 33.61 ms. Allocated memory is still 98.6 MB. Free memory was 71.5 MB in the beginning and 70.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 736.66 ms. Allocated memory is still 98.6 MB. Free memory was 70.3 MB in the beginning and 55.2 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3602.91 ms. Allocated memory was 98.6 MB in the beginning and 132.1 MB in the end (delta: 33.6 MB). Free memory was 54.7 MB in the beginning and 64.4 MB in the end (delta: -9.7 MB). Peak memory consumption was 26.7 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_14| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#length_14|: 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. [2021-10-13 07:32:11,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/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-4e77c04 [2021-10-13 07:32:14,837 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:32:14,841 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:32:14,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:32:14,906 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:32:14,907 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:32:14,909 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:32:14,912 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:32:14,914 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:32:14,915 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:32:14,916 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:32:14,917 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:32:14,918 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:32:14,919 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:32:14,921 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:32:14,922 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:32:14,923 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:32:14,924 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:32:14,926 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:32:14,928 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:32:14,930 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:32:14,935 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:32:14,938 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:32:14,939 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:32:14,942 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:32:14,942 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:32:14,943 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:32:14,944 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:32:14,945 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:32:14,946 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:32:14,946 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:32:14,947 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:32:14,948 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:32:14,949 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:32:14,950 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:32:14,950 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:32:14,951 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:32:14,951 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:32:14,951 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:32:14,952 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:32:14,953 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:32:14,954 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-13 07:32:14,979 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:32:14,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:32:14,980 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:32:14,981 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:32:14,981 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:32:14,981 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:32:14,981 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:32:14,981 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:32:14,982 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:32:14,982 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:32:14,983 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:32:14,983 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:32:14,983 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:32:14,983 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 07:32:14,983 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:32:14,984 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 07:32:14,985 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:32:14,985 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 07:32:14,985 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:32:14,985 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 07:32:14,985 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:32:14,986 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:32:14,986 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:32:14,986 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:32:14,986 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 07:32:14,986 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 07:32:14,987 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 07:32:14,987 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 07:32:14,987 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:32:14,987 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:32:14,987 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a05bdadad077833bc2e17446c15598150f193fe [2021-10-13 07:32:15,382 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:32:15,418 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:32:15,422 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:32:15,424 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:32:15,425 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:32:15,426 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-multidimensional/rev-3-u.c [2021-10-13 07:32:15,525 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/56994fe6a/cc6f9887ebf34fb697e724964e214b67/FLAG532fd45a6 [2021-10-13 07:32:16,110 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:32:16,110 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c [2021-10-13 07:32:16,118 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/56994fe6a/cc6f9887ebf34fb697e724964e214b67/FLAG532fd45a6 [2021-10-13 07:32:16,458 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/data/56994fe6a/cc6f9887ebf34fb697e724964e214b67 [2021-10-13 07:32:16,468 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:32:16,470 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:32:16,472 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:32:16,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:32:16,476 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:32:16,477 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,478 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5094060c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16, skipping insertion in model container [2021-10-13 07:32:16,479 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:32:16,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:32:16,678 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2021-10-13 07:32:16,713 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:32:16,734 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:32:16,786 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_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2021-10-13 07:32:16,819 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:32:16,834 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:32:16,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16 WrapperNode [2021-10-13 07:32:16,835 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:32:16,836 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:32:16,836 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:32:16,836 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:32:16,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,853 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,875 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:32:16,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:32:16,876 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:32:16,876 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:32:16,885 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,889 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,890 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,904 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,907 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,910 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:32:16,911 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:32:16,912 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:32:16,912 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:32:16,913 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (1/1) ... [2021-10-13 07:32:16,922 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:32:16,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:16,963 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:32:16,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:32:17,025 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 07:32:17,026 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:32:17,026 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-13 07:32:17,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:32:17,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:32:17,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:32:17,029 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-13 07:32:17,881 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:32:17,881 INFO L299 CfgBuilder]: Removed 15 assume(true) statements. [2021-10-13 07:32:17,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:32:17 BoogieIcfgContainer [2021-10-13 07:32:17,887 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:32:17,889 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:32:17,890 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:32:17,894 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:32:17,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:32:16" (1/3) ... [2021-10-13 07:32:17,896 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f55fe1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:32:17, skipping insertion in model container [2021-10-13 07:32:17,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:32:16" (2/3) ... [2021-10-13 07:32:17,898 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f55fe1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:32:17, skipping insertion in model container [2021-10-13 07:32:17,898 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:32:17" (3/3) ... [2021-10-13 07:32:17,900 INFO L111 eAbstractionObserver]: Analyzing ICFG rev-3-u.c [2021-10-13 07:32:17,907 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:32:17,907 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 07:32:18,008 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:32:18,021 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 [2021-10-13 07:32:18,022 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 07:32:18,043 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 25 states have (on average 1.8) internal successors, (45), 26 states have internal predecessors, (45), 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) [2021-10-13 07:32:18,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:32:18,056 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:18,057 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:18,058 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:18,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:18,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1568356865, now seen corresponding path program 1 times [2021-10-13 07:32:18,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:18,109 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1806306486] [2021-10-13 07:32:18,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:18,111 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:18,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:18,117 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:18,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 07:32:18,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:18,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 1 conjunts are in the unsatisfiable core [2021-10-13 07:32:18,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:18,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:18,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:18,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:18,473 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:18,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1806306486] [2021-10-13 07:32:18,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1806306486] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:18,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:18,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:32:18,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020404395] [2021-10-13 07:32:18,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-13 07:32:18,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:18,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-13 07:32:18,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:32:18,518 INFO L87 Difference]: Start difference. First operand has 27 states, 25 states have (on average 1.8) internal successors, (45), 26 states have internal predecessors, (45), 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 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:18,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:18,545 INFO L93 Difference]: Finished difference Result 52 states and 88 transitions. [2021-10-13 07:32:18,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-13 07:32:18,547 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-10-13 07:32:18,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:18,558 INFO L225 Difference]: With dead ends: 52 [2021-10-13 07:32:18,558 INFO L226 Difference]: Without dead ends: 23 [2021-10-13 07:32:18,561 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:32:18,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-10-13 07:32:18,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-10-13 07:32:18,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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) [2021-10-13 07:32:18,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-10-13 07:32:18,607 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 11 [2021-10-13 07:32:18,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:18,608 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-10-13 07:32:18,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:18,608 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-10-13 07:32:18,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:32:18,609 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:18,610 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:18,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:18,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:32:18,824 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:18,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:18,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1115669473, now seen corresponding path program 1 times [2021-10-13 07:32:18,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:18,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [612879119] [2021-10-13 07:32:18,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:18,827 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:18,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:18,828 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:18,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 07:32:18,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:18,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:18,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:19,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:19,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:19,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:32:19,162 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:19,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [612879119] [2021-10-13 07:32:19,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [612879119] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:19,163 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:19,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-10-13 07:32:19,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324385370] [2021-10-13 07:32:19,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:32:19,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:19,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:32:19,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:32:19,167 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:19,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:19,679 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2021-10-13 07:32:19,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:32:19,690 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-10-13 07:32:19,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:19,691 INFO L225 Difference]: With dead ends: 45 [2021-10-13 07:32:19,692 INFO L226 Difference]: Without dead ends: 29 [2021-10-13 07:32:19,692 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:32:19,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-10-13 07:32:19,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-10-13 07:32:19,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 28 states have internal predecessors, (39), 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) [2021-10-13 07:32:19,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 39 transitions. [2021-10-13 07:32:19,701 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 39 transitions. Word has length 11 [2021-10-13 07:32:19,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:19,701 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 39 transitions. [2021-10-13 07:32:19,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:32:19,702 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 39 transitions. [2021-10-13 07:32:19,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-10-13 07:32:19,703 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:19,703 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:19,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-10-13 07:32:19,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:32:19,917 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:19,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:19,918 INFO L82 PathProgramCache]: Analyzing trace with hash 742035169, now seen corresponding path program 1 times [2021-10-13 07:32:19,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:19,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1416360043] [2021-10-13 07:32:19,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:19,920 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:19,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:19,930 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:19,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 07:32:20,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:20,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:20,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:20,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:32:20,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:20,356 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:32:20,357 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:20,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1416360043] [2021-10-13 07:32:20,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1416360043] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:20,358 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:20,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 07:32:20,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356854554] [2021-10-13 07:32:20,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:32:20,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:20,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:32:20,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:32:20,362 INFO L87 Difference]: Start difference. First operand 29 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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) [2021-10-13 07:32:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:20,905 INFO L93 Difference]: Finished difference Result 75 states and 106 transitions. [2021-10-13 07:32:20,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:32:20,906 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 17 [2021-10-13 07:32:20,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:20,907 INFO L225 Difference]: With dead ends: 75 [2021-10-13 07:32:20,908 INFO L226 Difference]: Without dead ends: 52 [2021-10-13 07:32:20,908 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 63.3ms TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-13 07:32:20,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-10-13 07:32:20,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 47. [2021-10-13 07:32:20,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.3478260869565217) internal successors, (62), 46 states have internal predecessors, (62), 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) [2021-10-13 07:32:20,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2021-10-13 07:32:20,924 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 17 [2021-10-13 07:32:20,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:20,925 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2021-10-13 07:32:20,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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) [2021-10-13 07:32:20,926 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2021-10-13 07:32:20,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-10-13 07:32:20,927 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:20,927 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:20,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:21,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:32:21,142 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:21,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:21,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1930294047, now seen corresponding path program 1 times [2021-10-13 07:32:21,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:21,145 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1709523314] [2021-10-13 07:32:21,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:21,146 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:21,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:21,147 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:21,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 07:32:21,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:21,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:21,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:21,463 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 07:32:21,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:21,610 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 07:32:21,611 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:21,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1709523314] [2021-10-13 07:32:21,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1709523314] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:21,612 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:32:21,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 07:32:21,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525038902] [2021-10-13 07:32:21,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:32:21,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:21,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:32:21,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:32:21,616 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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) [2021-10-13 07:32:22,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:22,277 INFO L93 Difference]: Finished difference Result 114 states and 161 transitions. [2021-10-13 07:32:22,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:32:22,278 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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 29 [2021-10-13 07:32:22,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:22,280 INFO L225 Difference]: With dead ends: 114 [2021-10-13 07:32:22,280 INFO L226 Difference]: Without dead ends: 72 [2021-10-13 07:32:22,281 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 64.0ms TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-13 07:32:22,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-10-13 07:32:22,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 67. [2021-10-13 07:32:22,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2727272727272727) internal successors, (84), 66 states have internal predecessors, (84), 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) [2021-10-13 07:32:22,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 84 transitions. [2021-10-13 07:32:22,298 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 84 transitions. Word has length 29 [2021-10-13 07:32:22,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:22,299 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 84 transitions. [2021-10-13 07:32:22,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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) [2021-10-13 07:32:22,300 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 84 transitions. [2021-10-13 07:32:22,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-13 07:32:22,301 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:22,302 INFO L512 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:22,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:22,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:32:22,517 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:22,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:22,519 INFO L82 PathProgramCache]: Analyzing trace with hash 863846625, now seen corresponding path program 1 times [2021-10-13 07:32:22,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:22,520 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1301294997] [2021-10-13 07:32:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:22,520 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:22,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:22,522 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:22,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 07:32:22,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:22,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:22,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:22,928 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-10-13 07:32:22,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:23,205 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-10-13 07:32:23,206 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:23,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1301294997] [2021-10-13 07:32:23,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1301294997] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:23,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1463498918] [2021-10-13 07:32:23,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:23,207 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:32:23,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:32:23,219 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:32:23,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-10-13 07:32:23,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:23,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:23,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:23,713 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-10-13 07:32:23,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:23,891 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-10-13 07:32:23,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1463498918] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:23,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855703637] [2021-10-13 07:32:23,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:23,893 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:23,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:23,903 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:23,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 07:32:24,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:24,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:32:24,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-10-13 07:32:24,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:24,655 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-10-13 07:32:24,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855703637] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:32:24,656 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-13 07:32:24,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [6, 6, 6, 6] total 13 [2021-10-13 07:32:24,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640626102] [2021-10-13 07:32:24,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:32:24,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:24,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:32:24,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-10-13 07:32:24,659 INFO L87 Difference]: Start difference. First operand 67 states and 84 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 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) [2021-10-13 07:32:25,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:25,209 INFO L93 Difference]: Finished difference Result 129 states and 163 transitions. [2021-10-13 07:32:25,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:32:25,210 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 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 37 [2021-10-13 07:32:25,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:25,214 INFO L225 Difference]: With dead ends: 129 [2021-10-13 07:32:25,214 INFO L226 Difference]: Without dead ends: 105 [2021-10-13 07:32:25,215 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 261.9ms TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-10-13 07:32:25,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-10-13 07:32:25,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2021-10-13 07:32:25,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.2625) internal successors, (101), 80 states have internal predecessors, (101), 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) [2021-10-13 07:32:25,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 101 transitions. [2021-10-13 07:32:25,236 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 101 transitions. Word has length 37 [2021-10-13 07:32:25,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:25,237 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 101 transitions. [2021-10-13 07:32:25,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 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) [2021-10-13 07:32:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 101 transitions. [2021-10-13 07:32:25,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-10-13 07:32:25,240 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:25,241 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:25,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:25,456 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-10-13 07:32:25,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:25,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:25,844 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:25,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:25,845 INFO L82 PathProgramCache]: Analyzing trace with hash -986570111, now seen corresponding path program 1 times [2021-10-13 07:32:25,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:25,846 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [898505699] [2021-10-13 07:32:25,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:25,847 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:25,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:25,874 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:25,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 07:32:26,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:26,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:26,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:26,469 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-10-13 07:32:26,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:26,793 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-10-13 07:32:26,793 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:26,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [898505699] [2021-10-13 07:32:26,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [898505699] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:26,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1707078370] [2021-10-13 07:32:26,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:26,795 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:32:26,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:32:26,797 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:32:26,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 07:32:27,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:27,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:27,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:27,446 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-10-13 07:32:27,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-10-13 07:32:27,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1707078370] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:27,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336032306] [2021-10-13 07:32:27,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:32:27,686 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:27,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:27,688 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:27,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 07:32:28,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:32:28,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:28,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:28,772 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-10-13 07:32:28,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:29,207 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-10-13 07:32:29,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336032306] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:29,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:32:29,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 5, 5] total 16 [2021-10-13 07:32:29,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232319031] [2021-10-13 07:32:29,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-13 07:32:29,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:29,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-13 07:32:29,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-10-13 07:32:29,219 INFO L87 Difference]: Start difference. First operand 81 states and 101 transitions. Second operand has 16 states, 16 states have (on average 4.25) internal successors, (68), 16 states have internal predecessors, (68), 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) [2021-10-13 07:32:36,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:32:36,853 INFO L93 Difference]: Finished difference Result 675 states and 938 transitions. [2021-10-13 07:32:36,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-10-13 07:32:36,854 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.25) internal successors, (68), 16 states have internal predecessors, (68), 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 63 [2021-10-13 07:32:36,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:32:36,863 INFO L225 Difference]: With dead ends: 675 [2021-10-13 07:32:36,863 INFO L226 Difference]: Without dead ends: 601 [2021-10-13 07:32:36,867 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 2246.2ms TimeCoverageRelationStatistics Valid=828, Invalid=2142, Unknown=0, NotChecked=0, Total=2970 [2021-10-13 07:32:36,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-10-13 07:32:36,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 305. [2021-10-13 07:32:36,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.174342105263158) internal successors, (357), 304 states have internal predecessors, (357), 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) [2021-10-13 07:32:36,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 357 transitions. [2021-10-13 07:32:36,928 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 357 transitions. Word has length 63 [2021-10-13 07:32:36,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:32:36,928 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 357 transitions. [2021-10-13 07:32:36,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.25) internal successors, (68), 16 states have internal predecessors, (68), 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) [2021-10-13 07:32:36,929 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 357 transitions. [2021-10-13 07:32:36,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-10-13 07:32:36,946 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:32:36,946 INFO L512 BasicCegarLoop]: trace histogram [72, 72, 12, 12, 12, 12, 12, 12, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:32:36,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:37,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:37,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-13 07:32:37,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:32:37,558 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:32:37,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:32:37,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1319255359, now seen corresponding path program 2 times [2021-10-13 07:32:37,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:32:37,562 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1086935954] [2021-10-13 07:32:37,563 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:32:37,563 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:32:37,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:32:37,577 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:32:37,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-13 07:32:38,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:32:38,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:32:38,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 07:32:38,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:39,522 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 562 proven. 21 refuted. 0 times theorem prover too weak. 6899 trivial. 0 not checked. [2021-10-13 07:32:39,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:40,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 562 proven. 21 refuted. 0 times theorem prover too weak. 6899 trivial. 0 not checked. [2021-10-13 07:32:40,503 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:32:40,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1086935954] [2021-10-13 07:32:40,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1086935954] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:40,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [482748915] [2021-10-13 07:32:40,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:32:40,504 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:32:40,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:32:40,505 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:32:40,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-10-13 07:32:42,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:32:42,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:32:42,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 07:32:42,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:42,835 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 562 proven. 21 refuted. 0 times theorem prover too weak. 6899 trivial. 0 not checked. [2021-10-13 07:32:42,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 562 proven. 21 refuted. 0 times theorem prover too weak. 6899 trivial. 0 not checked. [2021-10-13 07:32:43,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [482748915] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:43,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494970615] [2021-10-13 07:32:43,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:32:43,505 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:32:43,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:32:43,507 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:32:43,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 07:32:45,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:32:45,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:32:45,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:32:45,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:32:46,339 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 1051 proven. 53 refuted. 0 times theorem prover too weak. 6378 trivial. 0 not checked. [2021-10-13 07:32:46,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:32:47,229 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 1051 proven. 53 refuted. 0 times theorem prover too weak. 6378 trivial. 0 not checked. [2021-10-13 07:32:47,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494970615] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:32:47,230 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:32:47,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 6, 6] total 25 [2021-10-13 07:32:47,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408521424] [2021-10-13 07:32:47,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-13 07:32:47,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:32:47,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-13 07:32:47,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=462, Unknown=0, NotChecked=0, Total=600 [2021-10-13 07:32:47,233 INFO L87 Difference]: Start difference. First operand 305 states and 357 transitions. Second operand has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2021-10-13 07:33:05,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:33:05,307 INFO L93 Difference]: Finished difference Result 2002 states and 2822 transitions. [2021-10-13 07:33:05,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-10-13 07:33:05,307 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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 263 [2021-10-13 07:33:05,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:33:05,317 INFO L225 Difference]: With dead ends: 2002 [2021-10-13 07:33:05,317 INFO L226 Difference]: Without dead ends: 1708 [2021-10-13 07:33:05,334 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1659 GetRequests, 1549 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4031 ImplicationChecksByTransitivity, 7000.2ms TimeCoverageRelationStatistics Valid=2985, Invalid=9447, Unknown=0, NotChecked=0, Total=12432 [2021-10-13 07:33:05,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1708 states. [2021-10-13 07:33:05,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1708 to 1541. [2021-10-13 07:33:05,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1541 states, 1540 states have (on average 1.114935064935065) internal successors, (1717), 1540 states have internal predecessors, (1717), 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) [2021-10-13 07:33:05,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1541 states to 1541 states and 1717 transitions. [2021-10-13 07:33:05,488 INFO L78 Accepts]: Start accepts. Automaton has 1541 states and 1717 transitions. Word has length 263 [2021-10-13 07:33:05,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:33:05,488 INFO L470 AbstractCegarLoop]: Abstraction has 1541 states and 1717 transitions. [2021-10-13 07:33:05,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2021-10-13 07:33:05,488 INFO L276 IsEmpty]: Start isEmpty. Operand 1541 states and 1717 transitions. [2021-10-13 07:33:05,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1272 [2021-10-13 07:33:05,564 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:33:05,565 INFO L512 BasicCegarLoop]: trace histogram [504, 504, 36, 36, 36, 36, 36, 36, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:33:05,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-10-13 07:33:05,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-13 07:33:06,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-10-13 07:33:06,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:33:06,172 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:33:06,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:33:06,173 INFO L82 PathProgramCache]: Analyzing trace with hash -897577407, now seen corresponding path program 3 times [2021-10-13 07:33:06,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:33:06,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [644887916] [2021-10-13 07:33:06,179 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:33:06,179 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:33:06,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:33:06,180 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:33:06,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-13 07:33:10,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-10-13 07:33:10,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:33:10,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-13 07:33:10,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:33:14,457 INFO L134 CoverageAnalysis]: Checked inductivity of 294114 backedges. 7922 proven. 105 refuted. 0 times theorem prover too weak. 286087 trivial. 0 not checked. [2021-10-13 07:33:14,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:33:19,049 INFO L134 CoverageAnalysis]: Checked inductivity of 294114 backedges. 7922 proven. 105 refuted. 0 times theorem prover too weak. 286087 trivial. 0 not checked. [2021-10-13 07:33:19,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:33:19,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [644887916] [2021-10-13 07:33:19,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [644887916] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:33:19,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [664747451] [2021-10-13 07:33:19,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:33:19,051 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:33:19,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:33:19,057 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:33:19,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-10-13 07:33:22,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 134 [2021-10-13 07:33:22,784 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 Check failure d_curr_model->isBuiltSuccess() [2021-10-13 07:33:22,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-10-13 07:33:22,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:33:22,987 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) Received EOF on stdin. stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 Check failure d_curr_model->isBuiltSuccess() at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheck.(TraceCheck.java:232) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheck.(InterpolatingTraceCheck.java:90) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:132) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) 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) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) Received EOF on stdin. stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 Check failure d_curr_model->isBuiltSuccess() at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:260) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.AnnotateAndAsserterWithStmtOrderPrioritization.annotateAndAssertOutsideLoopFirst2(AnnotateAndAsserterWithStmtOrderPrioritization.java:277) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.AnnotateAndAsserterWithStmtOrderPrioritization.buildAnnotatedSsaAndAssertTerms(AnnotateAndAsserterWithStmtOrderPrioritization.java:214) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheck.checkTrace(TraceCheck.java:312) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheck.(TraceCheck.java:211) ... 32 more Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 40 more [2021-10-13 07:33:22,991 INFO L168 Benchmark]: Toolchain (without parser) took 66520.12 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 51.3 MB in the beginning and 32.0 MB in the end (delta: 19.3 MB). Peak memory consumption was 47.6 MB. Max. memory is 16.1 GB. [2021-10-13 07:33:22,991 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 69.2 MB. Free memory is still 50.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:33:22,992 INFO L168 Benchmark]: CACSL2BoogieTranslator took 363.34 ms. Allocated memory is still 69.2 MB. Free memory was 51.1 MB in the beginning and 51.6 MB in the end (delta: -472.6 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:33:22,992 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.06 ms. Allocated memory is still 69.2 MB. Free memory was 51.5 MB in the beginning and 49.7 MB in the end (delta: 1.8 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:33:22,993 INFO L168 Benchmark]: Boogie Preprocessor took 34.95 ms. Allocated memory is still 69.2 MB. Free memory was 49.7 MB in the beginning and 48.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:33:22,993 INFO L168 Benchmark]: RCFGBuilder took 975.46 ms. Allocated memory is still 69.2 MB. Free memory was 48.4 MB in the beginning and 36.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-13 07:33:22,994 INFO L168 Benchmark]: TraceAbstraction took 65100.76 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 35.8 MB in the beginning and 32.0 MB in the end (delta: 3.7 MB). Peak memory consumption was 34.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:33:22,996 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 69.2 MB. Free memory is still 50.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 363.34 ms. Allocated memory is still 69.2 MB. Free memory was 51.1 MB in the beginning and 51.6 MB in the end (delta: -472.6 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.06 ms. Allocated memory is still 69.2 MB. Free memory was 51.5 MB in the beginning and 49.7 MB in the end (delta: 1.8 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 34.95 ms. Allocated memory is still 69.2 MB. Free memory was 49.7 MB in the beginning and 48.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 975.46 ms. Allocated memory is still 69.2 MB. Free memory was 48.4 MB in the beginning and 36.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 65100.76 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 35.8 MB in the beginning and 32.0 MB in the end (delta: 3.7 MB). Peak memory consumption was 34.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) Received EOF on stdin. stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 Check failure d_curr_model->isBuiltSuccess() de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16) with exit command (exit)) Received EOF on stdin. stderr output: Fatal failure within void CVC4::TheoryEngine::check(CVC4::theory::Theory::Effort) at /barrett/scratch/noetzli/barrett-cluster/cvc4_build_scripts/dest_fixed/src/cvc4-2020-08-25/src/theory/theory_engine.cpp:545 Check failure d_curr_model->isBuiltSuccess() : de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheck.(TraceCheck.java:232) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 07:33:23,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9a058b-a10d-4d8a-9bb8-1e225753e1e2/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...