./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_3+newton_2_7.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_3+newton_2_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V --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 a7443921b0608d3c2ff1c61e12bf7cf129e5c1aecf22f0fb9785817b90c162e7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:47:04,219 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:47:04,222 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:47:04,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:47:04,280 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:47:04,284 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:47:04,286 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:47:04,290 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:47:04,293 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:47:04,299 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:47:04,300 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:47:04,302 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:47:04,303 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:47:04,306 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:47:04,308 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:47:04,315 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:47:04,317 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:47:04,319 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:47:04,321 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:47:04,331 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:47:04,333 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:47:04,335 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:47:04,338 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:47:04,339 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:47:04,348 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:47:04,349 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:47:04,349 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:47:04,351 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:47:04,352 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:47:04,353 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:47:04,354 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:47:04,355 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:47:04,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:47:04,358 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:47:04,360 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:47:04,360 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:47:04,361 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:47:04,361 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:47:04,362 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:47:04,363 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:47:04,363 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:47:04,364 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:47:04,409 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:47:04,409 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:47:04,409 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:47:04,409 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:47:04,410 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:47:04,410 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:47:04,410 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:47:04,410 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:47:04,410 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:47:04,411 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:47:04,412 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:47:04,412 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:47:04,412 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:47:04,413 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:47:04,413 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:47:04,413 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:47:04,413 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:47:04,413 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:47:04,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:47:04,414 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:47:04,414 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:47:04,414 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:47:04,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:47:04,414 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:47:04,415 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:47:04,415 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:47:04,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:47:04,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:47:04,415 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:47:04,416 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:47:04,417 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:47:04,417 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_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a7443921b0608d3c2ff1c61e12bf7cf129e5c1aecf22f0fb9785817b90c162e7 [2021-11-23 02:47:04,690 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:47:04,720 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:47:04,723 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:47:04,725 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:47:04,725 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:47:04,727 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_3+newton_2_7.i [2021-11-23 02:47:04,801 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/data/c4d76d496/1a9291ac054244f2b76f23a5db9aecb2/FLAG5ade88230 [2021-11-23 02:47:05,350 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:47:05,350 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/sv-benchmarks/c/combinations/gcd_3+newton_2_7.i [2021-11-23 02:47:05,365 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/data/c4d76d496/1a9291ac054244f2b76f23a5db9aecb2/FLAG5ade88230 [2021-11-23 02:47:05,695 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/data/c4d76d496/1a9291ac054244f2b76f23a5db9aecb2 [2021-11-23 02:47:05,697 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:47:05,699 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:47:05,701 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:47:05,701 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:47:05,705 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:47:05,706 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:05" (1/1) ... [2021-11-23 02:47:05,707 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fd6126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:05, skipping insertion in model container [2021-11-23 02:47:05,707 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:05" (1/1) ... [2021-11-23 02:47:05,714 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:47:05,732 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:47:05,940 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_1788faa6-266d-4d40-b2c8-ad7ef2782f05/sv-benchmarks/c/combinations/gcd_3+newton_2_7.i[1226,1239] [2021-11-23 02:47:05,971 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_1788faa6-266d-4d40-b2c8-ad7ef2782f05/sv-benchmarks/c/combinations/gcd_3+newton_2_7.i[2841,2854] [2021-11-23 02:47:05,973 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:47:05,980 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:47:05,991 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_1788faa6-266d-4d40-b2c8-ad7ef2782f05/sv-benchmarks/c/combinations/gcd_3+newton_2_7.i[1226,1239] [2021-11-23 02:47:06,006 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_1788faa6-266d-4d40-b2c8-ad7ef2782f05/sv-benchmarks/c/combinations/gcd_3+newton_2_7.i[2841,2854] [2021-11-23 02:47:06,007 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:47:06,021 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:47:06,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06 WrapperNode [2021-11-23 02:47:06,022 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:47:06,023 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:47:06,023 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:47:06,024 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:47:06,031 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,039 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,063 INFO L137 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2021-11-23 02:47:06,063 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:47:06,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:47:06,064 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:47:06,065 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:47:06,073 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,074 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,076 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,076 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,092 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,096 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,098 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,100 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:47:06,101 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:47:06,101 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:47:06,102 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:47:06,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (1/1) ... [2021-11-23 02:47:06,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:47:06,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:47:06,150 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:47:06,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:47:06,192 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:47:06,192 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 02:47:06,192 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 02:47:06,192 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 02:47:06,193 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 02:47:06,193 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:47:06,193 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:47:06,193 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:47:06,265 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:47:06,266 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:47:06,524 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:47:06,605 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:47:06,605 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:47:06,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:06 BoogieIcfgContainer [2021-11-23 02:47:06,608 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:47:06,609 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:47:06,609 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:47:06,621 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:47:06,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:47:05" (1/3) ... [2021-11-23 02:47:06,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2be7a901 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:06, skipping insertion in model container [2021-11-23 02:47:06,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:06" (2/3) ... [2021-11-23 02:47:06,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2be7a901 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:06, skipping insertion in model container [2021-11-23 02:47:06,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:06" (3/3) ... [2021-11-23 02:47:06,625 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_3+newton_2_7.i [2021-11-23 02:47:06,631 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:47:06,632 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:47:06,699 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:47:06,710 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 [2021-11-23 02:47:06,711 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:47:06,742 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) [2021-11-23 02:47:06,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:47:06,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:06,749 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:47:06,750 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:06,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:06,755 INFO L85 PathProgramCache]: Analyzing trace with hash -499021812, now seen corresponding path program 1 times [2021-11-23 02:47:06,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:06,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542902695] [2021-11-23 02:47:06,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:06,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:06,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:07,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:47:07,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:07,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542902695] [2021-11-23 02:47:07,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542902695] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:07,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:07,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:47:07,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034728336] [2021-11-23 02:47:07,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:07,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:47:07,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:07,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:47:07,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:47:07,130 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 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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) [2021-11-23 02:47:07,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:07,334 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-11-23 02:47:07,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:47:07,336 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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 [2021-11-23 02:47:07,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:07,350 INFO L225 Difference]: With dead ends: 45 [2021-11-23 02:47:07,350 INFO L226 Difference]: Without dead ends: 21 [2021-11-23 02:47:07,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:47:07,358 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 20 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:07,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 64 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:47:07,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-23 02:47:07,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-23 02:47:07,404 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) [2021-11-23 02:47:07,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-23 02:47:07,408 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-11-23 02:47:07,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:07,408 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-23 02:47:07,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 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) [2021-11-23 02:47:07,409 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-23 02:47:07,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:47:07,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:07,412 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:47:07,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:47:07,412 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:07,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:07,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1643785969, now seen corresponding path program 1 times [2021-11-23 02:47:07,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:07,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41844504] [2021-11-23 02:47:07,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:07,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:07,450 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:47:07,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1497332431] [2021-11-23 02:47:07,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:07,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:47:07,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:47:07,457 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:47:07,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:47:07,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:07,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:47:07,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:47:21,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:47:21,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:47:29,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:47:29,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:29,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41844504] [2021-11-23 02:47:29,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:47:29,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497332431] [2021-11-23 02:47:29,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497332431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:47:29,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [424970030] [2021-11-23 02:47:29,774 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:47:29,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:47:29,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:47:29,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:47:29,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:47:32,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:47:45,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '174#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~b#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (< 0 |ULTIMATE.start_main1_~x~0#1|) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (ite (<= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~x~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |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|) (<= 0 (+ |ULTIMATE.start_main1_~y~0#1| 128)) (= |#NULL.base| 0))' at error location [2021-11-23 02:47:45,657 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:47:45,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:47:45,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-23 02:47:45,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331921061] [2021-11-23 02:47:45,658 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:47:45,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:47:45,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:45,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:47:45,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=142, Unknown=5, NotChecked=0, Total=182 [2021-11-23 02:47:45,661 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 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) [2021-11-23 02:48:31,334 WARN L227 SmtUtils]: Spent 42.46s on a formula simplification that was a NOOP. DAG size: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:48:31,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:31,707 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-23 02:48:31,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:48:31,708 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 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 7 [2021-11-23 02:48:31,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:31,709 INFO L225 Difference]: With dead ends: 26 [2021-11-23 02:48:31,709 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 02:48:31,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 74.3s TimeCoverageRelationStatistics Valid=41, Invalid=164, Unknown=5, NotChecked=0, Total=210 [2021-11-23 02:48:31,711 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:31,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 83 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 10 Unchecked, 0.5s Time] [2021-11-23 02:48:31,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 02:48:31,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 02:48:31,717 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) [2021-11-23 02:48:31,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-23 02:48:31,718 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2021-11-23 02:48:31,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:31,718 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-23 02:48:31,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 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) [2021-11-23 02:48:31,719 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-23 02:48:31,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:48:31,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:31,720 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:31,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:48:31,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:31,921 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:31,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:31,921 INFO L85 PathProgramCache]: Analyzing trace with hash -648649556, now seen corresponding path program 2 times [2021-11-23 02:48:31,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:31,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996432652] [2021-11-23 02:48:31,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:31,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:31,939 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:31,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1922939376] [2021-11-23 02:48:31,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:48:31,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:31,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:31,942 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:31,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:48:31,999 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:48:31,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:48:32,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:48:32,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:48:53,160 WARN L860 $PredicateComparison]: unable to prove that (and (exists ((|v_ULTIMATE.start_gcd_test_~b#1_24| Int)) (and (let ((.cse1 (+ |c_ULTIMATE.start_gcd_test_~a#1| 256))) (or (and (<= 0 |c_ULTIMATE.start_main1_~x~0#1|) (let ((.cse0 (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) (or (and (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0) (<= .cse0 127)) (and (< 127 .cse0) (= .cse1 .cse0))))) (and (< |c_ULTIMATE.start_main1_~x~0#1| 0) (let ((.cse2 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (or (let ((.cse3 (mod (+ (- 256) .cse2) |v_ULTIMATE.start_gcd_test_~b#1_24|))) (and (< 127 .cse2) (not (= .cse3 0)) (or (and (< |v_ULTIMATE.start_gcd_test_~b#1_24| 0) (= .cse1 (mod (+ .cse3 |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) (and (= .cse1 (mod (+ (* |v_ULTIMATE.start_gcd_test_~b#1_24| 255) .cse3) 256)) (<= 0 |v_ULTIMATE.start_gcd_test_~b#1_24|))))) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse2 |v_ULTIMATE.start_gcd_test_~b#1_24|) 256)) (<= .cse2 127))))))) (not (= |v_ULTIMATE.start_gcd_test_~b#1_24| 0)))) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (or (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (let ((.cse14 (mod |v_ULTIMATE.start_gcd_test_~a#1_27| |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse4 (mod .cse14 256))) (and (let ((.cse5 (+ |c_ULTIMATE.start_gcd_test_~b#1| 256))) (or (and (= .cse4 .cse5) (<= 0 |v_ULTIMATE.start_gcd_test_~a#1_27|)) (and (< |v_ULTIMATE.start_gcd_test_~a#1_27| 0) (let ((.cse16 (mod (+ |c_ULTIMATE.start_gcd_test_~a#1| .cse14) 256)) (.cse15 (< |c_ULTIMATE.start_gcd_test_~a#1| 0))) (let ((.cse6 (and (= .cse16 .cse5) .cse15)) (.cse8 (< 127 .cse16)) (.cse9 (<= .cse16 127)) (.cse10 (and .cse15 (= |c_ULTIMATE.start_gcd_test_~b#1| .cse16))) (.cse11 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse12 (mod (+ .cse14 (* |c_ULTIMATE.start_gcd_test_~a#1| 255)) 256))) (or (and (let ((.cse7 (and .cse11 (= .cse12 |c_ULTIMATE.start_gcd_test_~b#1|)))) (or (and (or .cse6 .cse7) .cse8) (and .cse9 (or .cse10 .cse7)))) (<= .cse12 127)) (and (< 127 .cse12) (let ((.cse13 (and .cse11 (= .cse12 .cse5)))) (or (and (or .cse6 .cse13) .cse8) (and .cse9 (or .cse10 .cse13))))))))))) (< 127 .cse4))))) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (let ((.cse28 (mod |v_ULTIMATE.start_gcd_test_~a#1_27| |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse17 (mod .cse28 256))) (and (<= .cse17 127) (let ((.cse18 (= .cse28 0))) (or (and (or .cse18 (<= 0 |v_ULTIMATE.start_gcd_test_~a#1_27|)) (= |c_ULTIMATE.start_gcd_test_~b#1| .cse17)) (and (< |v_ULTIMATE.start_gcd_test_~a#1_27| 0) (not .cse18) (let ((.cse30 (mod (+ |c_ULTIMATE.start_gcd_test_~a#1| .cse28) 256)) (.cse27 (+ |c_ULTIMATE.start_gcd_test_~b#1| 256)) (.cse29 (< |c_ULTIMATE.start_gcd_test_~a#1| 0))) (let ((.cse19 (and (= .cse30 .cse27) .cse29)) (.cse21 (< 127 .cse30)) (.cse22 (<= .cse30 127)) (.cse23 (and .cse29 (= |c_ULTIMATE.start_gcd_test_~b#1| .cse30))) (.cse24 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse25 (mod (+ .cse28 (* |c_ULTIMATE.start_gcd_test_~a#1| 255)) 256))) (or (and (let ((.cse20 (and .cse24 (= .cse25 |c_ULTIMATE.start_gcd_test_~b#1|)))) (or (and (or .cse19 .cse20) .cse21) (and .cse22 (or .cse23 .cse20)))) (<= .cse25 127)) (and (< 127 .cse25) (let ((.cse26 (and .cse24 (= .cse25 .cse27)))) (or (and (or .cse19 .cse26) .cse21) (and .cse22 (or .cse23 .cse26))))))))))))))))) is different from true [2021-11-23 02:49:11,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-23 02:49:11,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:45,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:45,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:45,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996432652] [2021-11-23 02:49:45,325 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:49:45,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922939376] [2021-11-23 02:49:45,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922939376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:45,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511128460] [2021-11-23 02:49:45,328 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:49:45,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:45,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:45,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:45,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:45,663 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:00,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '300#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~b#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (< 0 |ULTIMATE.start_main1_~x~0#1|) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (ite (<= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~x~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |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|) (<= 0 (+ |ULTIMATE.start_main1_~y~0#1| 128)) (= |#NULL.base| 0))' at error location [2021-11-23 02:50:00,555 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:00,555 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:50:00,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-11-23 02:50:00,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464240292] [2021-11-23 02:50:00,556 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:00,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:50:00,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:00,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:50:00,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=155, Unknown=14, NotChecked=26, Total=240 [2021-11-23 02:50:00,558 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2021-11-23 02:50:18,685 WARN L227 SmtUtils]: Spent 10.10s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:50:47,486 WARN L227 SmtUtils]: Spent 12.33s on a formula simplification. DAG size of input: 119 DAG size of output: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:50:52,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:52,236 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-11-23 02:50:52,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:50:52,237 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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 8 [2021-11-23 02:50:52,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:52,237 INFO L225 Difference]: With dead ends: 30 [2021-11-23 02:50:52,238 INFO L226 Difference]: Without dead ends: 25 [2021-11-23 02:50:52,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 105.7s TimeCoverageRelationStatistics Valid=61, Invalid=227, Unknown=22, NotChecked=32, Total=342 [2021-11-23 02:50:52,240 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:52,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 83 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 29 Unchecked, 0.2s Time] [2021-11-23 02:50:52,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-23 02:50:52,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-23 02:50:52,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 18 states have internal predecessors, (19), 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) [2021-11-23 02:50:52,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-11-23 02:50:52,252 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 8 [2021-11-23 02:50:52,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:52,253 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-11-23 02:50:52,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2021-11-23 02:50:52,254 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-11-23 02:50:52,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:50:52,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:52,255 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:52,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:52,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:52,462 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:52,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:52,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1916224945, now seen corresponding path program 3 times [2021-11-23 02:50:52,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:52,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497547096] [2021-11-23 02:50:52,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:52,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:52,474 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:50:52,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977556814] [2021-11-23 02:50:52,474 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:50:52,475 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:52,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:52,494 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:52,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1788faa6-266d-4d40-b2c8-ad7ef2782f05/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:50:52,792 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:50:52,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:50:52,794 WARN L261 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-23 02:50:52,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:18,891 WARN L227 SmtUtils]: Spent 16.79s on a formula simplification. DAG size of input: 82 DAG size of output: 73 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:53:57,583 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (exists ((|ULTIMATE.start_gcd_test_#in~b#1| Int)) (and (let ((.cse2 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (let ((.cse0 (<= 0 |c_ULTIMATE.start_main1_~x~0#1|)) (.cse8 (< |c_ULTIMATE.start_main1_~x~0#1| 0)) (.cse1 (<= .cse2 127)) (.cse5 (+ |c_ULTIMATE.start_gcd_test_~a#1| 256)) (.cse4 (< 127 .cse2)) (.cse7 (+ (- 256) .cse2)) (.cse6 (* |ULTIMATE.start_gcd_test_#in~b#1| 255))) (or (and (or (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_gcd_test_#in~b#1|) 256)) .cse0) (and (or (and .cse1 (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse2 |ULTIMATE.start_gcd_test_#in~b#1|) 256))) (let ((.cse3 (mod .cse7 |ULTIMATE.start_gcd_test_#in~b#1|))) (and (not (= .cse3 0)) .cse4 (= .cse5 (mod (+ .cse3 .cse6) 256))))) .cse8)) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (not (= |ULTIMATE.start_gcd_test_#in~b#1| 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |ULTIMATE.start_gcd_test_#in~b#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~b#1| 0) (let ((.cse9 (mod .cse6 256))) (or (let ((.cse10 (+ .cse9 (- 256)))) (and (< 127 .cse9) (or (and .cse0 (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |c_ULTIMATE.start_main1_~x~0#1| .cse10) 256))) (and .cse8 (or (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse2 .cse10) 256)) .cse1) (let ((.cse11 (mod .cse7 .cse10))) (and (= .cse5 (mod (+ .cse9 .cse11) 256)) .cse4 (not (= .cse11 0))))))) (let ((.cse12 (mod .cse10 |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse13 (= .cse12 0))) (or (and (= (mod .cse12 256) |c_ULTIMATE.start_gcd_test_~b#1|) .cse13) (and (let ((.cse14 (+ |c_ULTIMATE.start_gcd_test_~b#1| 256))) (or (and (= (mod (+ |c_ULTIMATE.start_gcd_test_~a#1| .cse12) 256) .cse14) (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (and (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|) (= (mod (+ (* |c_ULTIMATE.start_gcd_test_~a#1| 255) .cse12) 256) .cse14)))) (not .cse13))))))) (and (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse9 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (not (= .cse9 0)) (<= .cse9 127) (or (and .cse0 (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |c_ULTIMATE.start_main1_~x~0#1| .cse9) 256))) (and .cse8 (or (and .cse1 (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse2 .cse9) 256))) (let ((.cse15 (mod .cse7 .cse9))) (and (= .cse5 (mod (+ .cse15 (* .cse9 255)) 256)) .cse4 (not (= .cse15 0)))))))))))))) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127)))) is different from false [2021-11-23 03:00:05,316 WARN L838 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_gcd_test_#in~b#1| Int)) (and (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (let ((.cse11 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (let ((.cse3 (* |c_ULTIMATE.start_gcd_test_~a#1| 255)) (.cse0 (< |c_ULTIMATE.start_main1_~x~0#1| 0)) (.cse6 (< 127 .cse11)) (.cse4 (+ |c_ULTIMATE.start_gcd_test_~b#1| 256)) (.cse7 (+ (- 256) .cse11)) (.cse9 (<= .cse11 127)) (.cse13 (<= 0 |c_ULTIMATE.start_main1_~x~0#1|)) (.cse8 (* |ULTIMATE.start_gcd_test_#in~b#1| 255))) (or (and (or (and .cse0 (or (let ((.cse5 (+ (- 256) (mod (+ (mod .cse7 |ULTIMATE.start_gcd_test_#in~b#1|) .cse8) 256)))) (and (let ((.cse1 (mod .cse5 |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse2 (= .cse1 0))) (or (and (= |c_ULTIMATE.start_gcd_test_~b#1| (mod .cse1 256)) .cse2) (and (not .cse2) (= (mod (+ .cse3 .cse1) 256) .cse4))))) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |ULTIMATE.start_gcd_test_#in~b#1| .cse5) 256)) .cse6)) (let ((.cse10 (mod (mod .cse11 |ULTIMATE.start_gcd_test_#in~b#1|) 256))) (and .cse9 (not (= .cse10 0)) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |ULTIMATE.start_gcd_test_#in~b#1| .cse10) 256)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse10 |c_ULTIMATE.start_gcd_test_~a#1|) 256)))))) (let ((.cse12 (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_gcd_test_#in~b#1|) 256))) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod |ULTIMATE.start_gcd_test_#in~b#1| .cse12) 256)) .cse13 (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse12 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (not (= .cse12 0))))) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|)) (and (< |ULTIMATE.start_gcd_test_#in~b#1| 0) (let ((.cse14 (mod .cse8 256))) (or (and (<= .cse14 127) (or (and (or (let ((.cse17 (+ (mod (+ (mod .cse7 .cse14) (* .cse14 255)) 256) (- 256)))) (and (let ((.cse16 (mod .cse17 |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse15 (= .cse16 0))) (or (and .cse15 (= |c_ULTIMATE.start_gcd_test_~b#1| (mod .cse16 256))) (and (= (mod (+ .cse3 .cse16) 256) .cse4) (not .cse15))))) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse14 .cse17) 256)) .cse6)) (let ((.cse18 (mod (mod .cse11 .cse14) 256))) (and .cse9 (not (= .cse18 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse18 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse14 .cse18) 256))))) .cse0) (let ((.cse19 (mod (mod |c_ULTIMATE.start_main1_~x~0#1| .cse14) 256))) (and (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse19 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod .cse14 .cse19) 256)) .cse13 (not (= .cse19 0)))))) (and (< 127 .cse14) (let ((.cse20 (+ |c_ULTIMATE.start_gcd_test_~a#1| 256)) (.cse26 (+ .cse14 (- 256)))) (or (and .cse0 (or (let ((.cse21 (mod (+ .cse14 (mod .cse7 .cse26)) 256))) (let ((.cse25 (+ .cse21 (- 256)))) (let ((.cse22 (mod .cse26 .cse25))) (and (= .cse20 (mod (+ .cse21 .cse22) 256)) (not (= .cse22 0)) .cse6 (let ((.cse24 (mod .cse25 |c_ULTIMATE.start_gcd_test_~a#1|))) (let ((.cse23 (= .cse24 0))) (or (and .cse23 (= |c_ULTIMATE.start_gcd_test_~b#1| (mod .cse24 256))) (and (= (mod (+ |c_ULTIMATE.start_gcd_test_~a#1| .cse24) 256) .cse4) (not .cse23))))))))) (let ((.cse28 (mod (mod .cse11 .cse26) 256))) (let ((.cse27 (mod .cse26 .cse28))) (and .cse9 (= .cse20 (mod (+ .cse27 (* .cse28 255)) 256)) (not (= .cse28 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse28 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (not (= .cse27 0))))))) (let ((.cse29 (mod (mod |c_ULTIMATE.start_main1_~x~0#1| .cse26) 256))) (let ((.cse30 (mod .cse26 .cse29))) (and .cse13 (not (= .cse29 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod .cse29 |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (= (mod (+ .cse30 (* .cse29 255)) 256) .cse20) (not (= .cse30 0)))))))))))))))) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0))) is different from false