./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7 --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 dc4c84af925d120ea9b9db9aa78160f13c1157e642c02b4448c62c56bbe753dd --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:13:01,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:13:01,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:13:01,417 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:13:01,418 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:13:01,423 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:13:01,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:13:01,428 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:13:01,431 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:13:01,438 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:13:01,439 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:13:01,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:13:01,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:13:01,445 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:13:01,447 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:13:01,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:13:01,455 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:13:01,456 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:13:01,459 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:13:01,469 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:13:01,471 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:13:01,472 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:13:01,475 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:13:01,476 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:13:01,485 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:13:01,485 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:13:01,486 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:13:01,488 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:13:01,488 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:13:01,490 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:13:01,490 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:13:01,491 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:13:01,493 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:13:01,494 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:13:01,496 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:13:01,496 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:13:01,497 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:13:01,497 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:13:01,497 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:13:01,498 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:13:01,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:13:01,500 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:13:01,543 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:13:01,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:13:01,544 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:13:01,544 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:13:01,545 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:13:01,545 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:13:01,545 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:13:01,545 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:13:01,546 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:13:01,546 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:13:01,547 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:13:01,547 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:13:01,547 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:13:01,547 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:13:01,547 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:13:01,548 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:13:01,548 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:13:01,548 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:13:01,549 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:13:01,549 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:13:01,549 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:13:01,549 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:13:01,549 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:13:01,550 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:13:01,550 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:13:01,550 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:13:01,551 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:13:01,552 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:13:01,552 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:13:01,552 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:13:01,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:13:01,553 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:13:01,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:13:01,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:13:01,553 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:13:01,553 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:13:01,554 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:13:01,554 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:13:01,554 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:13:01,554 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:13:01,554 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:13:01,555 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_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dc4c84af925d120ea9b9db9aa78160f13c1157e642c02b4448c62c56bbe753dd [2021-11-25 19:13:01,872 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:13:01,893 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:13:01,896 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:13:01,897 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:13:01,897 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:13:01,899 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/gcd_1+newton_2_1.i [2021-11-25 19:13:01,983 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/data/8145b5114/5e0d5d53847b4db797d44df912af1980/FLAG4a24a5060 [2021-11-25 19:13:02,497 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:13:02,498 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/sv-benchmarks/c/combinations/gcd_1+newton_2_1.i [2021-11-25 19:13:02,505 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/data/8145b5114/5e0d5d53847b4db797d44df912af1980/FLAG4a24a5060 [2021-11-25 19:13:02,848 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/data/8145b5114/5e0d5d53847b4db797d44df912af1980 [2021-11-25 19:13:02,851 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:13:02,852 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:13:02,854 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:13:02,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:13:02,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:13:02,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:13:02" (1/1) ... [2021-11-25 19:13:02,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@243a7800 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:02, skipping insertion in model container [2021-11-25 19:13:02,874 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:13:02" (1/1) ... [2021-11-25 19:13:02,881 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:13:02,905 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:13:03,050 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/sv-benchmarks/c/combinations/gcd_1+newton_2_1.i[1226,1239] [2021-11-25 19:13:03,078 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/sv-benchmarks/c/combinations/gcd_1+newton_2_1.i[2807,2820] [2021-11-25 19:13:03,080 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:13:03,088 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:13:03,100 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/sv-benchmarks/c/combinations/gcd_1+newton_2_1.i[1226,1239] [2021-11-25 19:13:03,112 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/sv-benchmarks/c/combinations/gcd_1+newton_2_1.i[2807,2820] [2021-11-25 19:13:03,113 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:13:03,127 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:13:03,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03 WrapperNode [2021-11-25 19:13:03,129 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:13:03,130 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:13:03,130 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:13:03,130 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:13:03,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,156 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,192 INFO L137 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2021-11-25 19:13:03,192 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:13:03,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:13:03,193 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:13:03,194 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:13:03,203 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,203 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,208 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,208 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,224 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,231 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,238 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,247 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:13:03,248 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:13:03,248 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:13:03,248 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:13:03,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (1/1) ... [2021-11-25 19:13:03,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:13:03,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:03,283 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:13:03,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:13:03,336 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:13:03,336 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-25 19:13:03,336 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-25 19:13:03,337 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-25 19:13:03,337 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-25 19:13:03,337 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:13:03,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:13:03,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:13:03,411 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:13:03,413 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:13:03,631 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:13:03,698 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:13:03,704 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:13:03,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:13:03 BoogieIcfgContainer [2021-11-25 19:13:03,707 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:13:03,709 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:13:03,709 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:13:03,716 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:13:03,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:13:02" (1/3) ... [2021-11-25 19:13:03,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2947d3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:13:03, skipping insertion in model container [2021-11-25 19:13:03,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:13:03" (2/3) ... [2021-11-25 19:13:03,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2947d3d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:13:03, skipping insertion in model container [2021-11-25 19:13:03,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:13:03" (3/3) ... [2021-11-25 19:13:03,721 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_1.i [2021-11-25 19:13:03,727 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:13:03,727 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 19:13:03,790 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:13:03,798 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:13:03,799 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 19:13:03,829 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:13:03,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:13:03,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:03,834 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:13:03,835 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:03,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:03,841 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2021-11-25 19:13:03,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:03,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836393818] [2021-11-25 19:13:03,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:03,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:03,955 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:13:03,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [449981779] [2021-11-25 19:13:03,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:03,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:03,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:03,960 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:03,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:13:04,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:04,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:13:04,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:13:04,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:13:04,166 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:13:04,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:13:04,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836393818] [2021-11-25 19:13:04,167 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:13:04,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449981779] [2021-11-25 19:13:04,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449981779] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:13:04,168 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:13:04,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:13:04,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628117737] [2021-11-25 19:13:04,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:13:04,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:13:04,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:04,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:13:04,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:13:04,205 INFO L87 Difference]: Start difference. First operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-25 19:13:04,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:04,249 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-11-25 19:13:04,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:13:04,251 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2021-11-25 19:13:04,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:04,258 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:13:04,258 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 19:13:04,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:13:04,264 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:04,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:13:04,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 19:13:04,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 19:13:04,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:13:04,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-25 19:13:04,329 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-11-25 19:13:04,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:04,330 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-25 19:13:04,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-25 19:13:04,331 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-25 19:13:04,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:13:04,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:04,332 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:04,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:13:04,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 19:13:04,557 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:04,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:04,558 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2021-11-25 19:13:04,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:04,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57240330] [2021-11-25 19:13:04,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:04,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:04,578 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:13:04,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1131711660] [2021-11-25 19:13:04,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:04,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:04,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:04,585 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:04,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:13:04,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:04,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:13:04,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:13:04,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:13:04,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:13:04,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:13:04,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:13:04,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57240330] [2021-11-25 19:13:04,869 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:13:04,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131711660] [2021-11-25 19:13:04,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131711660] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:13:04,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759383704] [2021-11-25 19:13:04,901 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:13:04,901 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:13:04,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:13:04,911 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:13:04,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:13:05,237 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:13:05,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:13:05,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:13:05,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:13:05,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-11-25 19:13:05,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434399456] [2021-11-25 19:13:05,507 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:13:05,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:13:05,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:05,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:13:05,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:13:05,509 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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) [2021-11-25 19:13:05,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:05,607 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-25 19:13:05,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:13:05,607 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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 7 [2021-11-25 19:13:05,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:05,608 INFO L225 Difference]: With dead ends: 25 [2021-11-25 19:13:05,608 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 19:13:05,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:13:05,610 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:05,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 85 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:13:05,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 19:13:05,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-25 19:13:05,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:13:05,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-25 19:13:05,622 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2021-11-25 19:13:05,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:05,623 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-25 19:13:05,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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) [2021-11-25 19:13:05,623 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-25 19:13:05,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:13:05,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:05,624 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:05,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:13:05,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 19:13:05,841 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:05,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:05,842 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2021-11-25 19:13:05,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:05,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106924227] [2021-11-25 19:13:05,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:05,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:05,851 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:13:05,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1401783730] [2021-11-25 19:13:05,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:13:05,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:05,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:05,853 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:05,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:13:14,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:13:14,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:13:14,073 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:13:14,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:15:08,234 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256)) (< |ULTIMATE.start_main1_~x~0#1| 0) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-25 19:16:21,924 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_main1_~x~0#1| Int)) (let ((.cse0 (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (< |ULTIMATE.start_main1_~x~0#1| 0) (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= .cse0 0)) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-25 19:17:04,685 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_main1_~x~0#1| Int)) (let ((.cse0 (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (< |ULTIMATE.start_main1_~x~0#1| 0) (not (= .cse0 0)) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-25 19:17:06,690 WARN L860 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_main1_~x~0#1| Int)) (let ((.cse0 (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (< |ULTIMATE.start_main1_~x~0#1| 0) (not (= .cse0 0)) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_main1_~y~0#1|) 0)))) is different from true [2021-11-25 19:17:06,691 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-25 19:17:06,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:18:28,126 WARN L227 SmtUtils]: Spent 47.07s on a formula simplification that was a NOOP. DAG size: 120 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:19:31,208 WARN L227 SmtUtils]: Spent 29.70s on a formula simplification that was a NOOP. DAG size: 38 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:20:52,114 WARN L227 SmtUtils]: Spent 5.45s on a formula simplification. DAG size of input: 7 DAG size of output: 1 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:20:56,125 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* |v_ULTIMATE.start_main1_~x~0#1_7| 255) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (= .cse0 0) (not (= (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256) 0)) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0))))) is different from false [2021-11-25 19:20:58,130 WARN L860 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* |v_ULTIMATE.start_main1_~x~0#1_7| 255) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (= .cse0 0) (not (= (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256) 0)) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0))))) is different from true [2021-11-25 19:20:58,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:20:58,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:20:58,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106924227] [2021-11-25 19:20:58,132 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:20:58,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401783730] [2021-11-25 19:20:58,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401783730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:20:58,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1067732812] [2021-11-25 19:20:58,135 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:20:58,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:20:58,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:20:58,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:20:58,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:20:58,304 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:21:20,270 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '294#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:21:20,271 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:21:20,271 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:21:20,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 14 [2021-11-25 19:21:20,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166178934] [2021-11-25 19:21:20,271 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:21:20,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:21:20,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:21:20,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:21:20,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=158, Unknown=21, NotChecked=116, Total=342 [2021-11-25 19:21:20,274 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:21:22,295 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-25 19:22:18,657 WARN L227 SmtUtils]: Spent 41.31s on a formula simplification. DAG size of input: 43 DAG size of output: 9 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:22:22,330 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse35 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse36 (mod (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse35) 256))) (let ((.cse24 (+ 256 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse37 (mod (+ (* |c_ULTIMATE.start_gcd_test_~b#1| 255) .cse35) 256)) (.cse12 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse32 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse36) 256) 0))) (.cse33 (= |c_ULTIMATE.start_main1_~y~0#1| .cse36)) (.cse34 (= .cse36 0))) (let ((.cse23 (or .cse12 .cse32 .cse33 .cse34)) (.cse11 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse37) 256) 0))) (.cse13 (= .cse37 0)) (.cse14 (= .cse37 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse15 (< 127 .cse37)) (.cse16 (<= .cse37 127)) (.cse4 (<= .cse36 127)) (.cse8 (< 127 .cse36)) (.cse9 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse18 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse37)) 256) 0))) (.cse19 (= .cse37 .cse24)) (.cse22 (<= 0 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse20 (= .cse24 .cse36)) (.cse21 (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse36)) 256)))) (.cse26 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse25 (mod .cse35 256))) (and (or (let ((.cse1 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (and (let ((.cse0 (mod (mod .cse1 |c_ULTIMATE.start_main1_~y~0#1|) 256))) (or (= .cse0 0) (< 127 .cse1) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0)))) (let ((.cse2 (mod (+ (- 256) .cse1) |c_ULTIMATE.start_main1_~y~0#1|))) (or (<= .cse1 127) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| (+ (mod (+ (* |c_ULTIMATE.start_main1_~y~0#1| 255) .cse2) 256) (- 256))) 256) 0)) (= .cse2 0))))) (not (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (<= 0 |c_ULTIMATE.start_main1_~x~0#1|) (<= |c_ULTIMATE.start_main1_~y~0#1| 0)) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (or (and (< |ULTIMATE.start_main1_~x~0#1| 0) (let ((.cse3 (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256))) (or (and (<= .cse3 127) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse3)) (and (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse3) (< 127 .cse3))))) (and (= |c_ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_main1_~x~0#1|) (<= 0 |ULTIMATE.start_main1_~x~0#1|))) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0))) (= |c_ULTIMATE.start_gcd_test_~b#1| |c_ULTIMATE.start_main1_~y~0#1|) (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |c_ULTIMATE.start_main1_~x~0#1| 128)) (or (let ((.cse10 (or (= .cse24 .cse25) .cse26 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse25)) 256) 0))))) (let ((.cse7 (or (and .cse10 .cse23) .cse22)) (.cse6 (or (and .cse10 (or .cse12 .cse20 .cse21)) .cse22))) (and (or (let ((.cse5 (or .cse9 (and .cse10 (or .cse11 .cse12 .cse13 .cse14))))) (and (or .cse4 (and .cse5 .cse6)) (or (and .cse5 .cse7) .cse8))) .cse15) (or .cse16 (let ((.cse17 (or .cse9 (and .cse10 (or .cse12 .cse18 .cse19))))) (and (or (and .cse17 .cse7) .cse8) (or .cse4 (and .cse6 .cse17)))))))) (<= .cse25 127)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (or (< 127 .cse25) (let ((.cse29 (or .cse26 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse25) 256) 0)) (= |c_ULTIMATE.start_main1_~y~0#1| .cse25) (= 0 .cse25))) (.cse30 (= .cse35 0))) (let ((.cse27 (or .cse22 (and .cse29 (or .cse12 .cse20 .cse21 .cse30))))) (and (or (let ((.cse28 (or .cse9 (and .cse29 (or .cse11 .cse12 .cse13 .cse14 .cse30))))) (and (or .cse4 (and .cse27 .cse28)) (or (and (or (and .cse29 .cse23) .cse22) .cse28) .cse8))) .cse15) (or .cse16 (let ((.cse31 (or .cse9 (and (or .cse12 .cse18 .cse19 .cse30) .cse29)))) (and (or .cse4 (and .cse31 .cse27)) (or (and (or .cse22 (and (or .cse12 .cse32 .cse33 .cse34 .cse30) .cse29)) .cse31) .cse8))))))))))))) is different from true [2021-11-25 19:22:24,339 WARN L838 $PredicateComparison]: unable to prove that (and (or (= |c_ULTIMATE.start_gcd_test_~b#1| 0) (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) 256))) (= |c_ULTIMATE.start_gcd_test_~b#1| |c_ULTIMATE.start_main1_~y~0#1|) (< (+ |c_ULTIMATE.start_gcd_test_~b#1| 128) 0) (< 127 |c_ULTIMATE.start_gcd_test_~b#1|)) (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (or (and (< |ULTIMATE.start_main1_~x~0#1| 0) (let ((.cse0 (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256))) (or (and (< 127 .cse0) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod (+ (- 256) .cse0) |c_ULTIMATE.start_gcd_test_~a#1|) 256))) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse0 |c_ULTIMATE.start_gcd_test_~a#1|) 256))))) (and (<= 0 |ULTIMATE.start_main1_~x~0#1|) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256)))) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0))) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (= |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|)) is different from false [2021-11-25 19:22:26,347 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:22:29,076 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (or (< 127 |c_ULTIMATE.start_gcd_test_~a#1|) (not (= |c_ULTIMATE.start_gcd_test_~b#1| 0)) (< (+ |c_ULTIMATE.start_gcd_test_~a#1| 128) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256)) (< |ULTIMATE.start_main1_~x~0#1| 0) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-25 19:22:31,087 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:22:31,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:22:31,382 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-25 19:22:31,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:22:31,383 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:22:31,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:22:31,384 INFO L225 Difference]: With dead ends: 26 [2021-11-25 19:22:31,384 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 19:22:31,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 7 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 198.7s TimeCoverageRelationStatistics Valid=57, Invalid=182, Unknown=29, NotChecked=238, Total=506 [2021-11-25 19:22:31,386 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 2 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:22:31,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 124 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 3 Unknown, 51 Unchecked, 7.1s Time] [2021-11-25 19:22:31,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 19:22:31,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 19:22:31,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:22:31,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-25 19:22:31,393 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2021-11-25 19:22:31,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:22:31,393 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-25 19:22:31,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:22:31,394 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-25 19:22:31,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 19:22:31,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:22:31,394 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-11-25 19:22:31,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:22:31,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:31,595 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:22:31,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:22:31,596 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2021-11-25 19:22:31,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:22:31,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291448711] [2021-11-25 19:22:31,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:22:31,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:22:31,609 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:22:31,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [440379037] [2021-11-25 19:22:31,609 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:22:31,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:22:31,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:22:31,611 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:22:31,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0308105d-cef4-44a9-8734-f5b2a0bbf432/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:22:43,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:22:43,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:22:43,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 19:22:43,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:25:47,050 WARN L838 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (and (< |ULTIMATE.start_main1_~x~0#1| 0) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|) (= (mod |ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0))) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0))) is different from false