./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+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_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/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_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/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_95244725-e8d9-4700-866d-3bdcd65d9409/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 184de52a0dff4eb1d8c7e38c30c44a1d55b19bad29c4bb3af8f1421516bacfd9 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:51:52,496 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:51:52,499 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:51:52,533 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:51:52,534 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:51:52,535 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:51:52,537 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:51:52,539 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:51:52,541 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:51:52,543 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:51:52,544 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:51:52,545 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:51:52,546 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:51:52,547 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:51:52,549 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:51:52,551 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:51:52,552 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:51:52,553 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:51:52,555 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:51:52,558 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:51:52,560 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:51:52,562 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:51:52,563 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:51:52,564 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:51:52,569 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:51:52,569 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:51:52,570 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:51:52,571 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:51:52,572 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:51:52,573 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:51:52,573 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:51:52,574 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:51:52,575 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:51:52,576 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:51:52,578 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:51:52,578 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:51:52,579 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:51:52,579 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:51:52,580 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:51:52,581 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:51:52,582 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:51:52,583 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 01:51:52,611 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:51:52,611 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:51:52,611 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:51:52,612 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:51:52,612 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:51:52,613 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:51:52,613 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:51:52,613 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:51:52,613 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:51:52,613 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:51:52,614 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:51:52,614 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:51:52,614 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:51:52,614 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:51:52,614 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:51:52,615 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:51:52,615 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:51:52,615 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:51:52,616 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:51:52,616 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 01:51:52,616 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:51:52,617 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 01:51:52,617 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:51:52,617 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 01:51:52,617 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:51:52,617 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 01:51:52,618 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 01:51:52,618 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 01:51:52,618 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:51:52,618 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 01:51:52,618 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:51:52,619 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:51:52,619 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:51:52,619 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:51:52,619 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:51:52,620 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 01:51:52,620 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:51:52,620 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:51:52,620 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 01:51:52,620 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:51:52,621 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:51:52,621 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_95244725-e8d9-4700-866d-3bdcd65d9409/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 184de52a0dff4eb1d8c7e38c30c44a1d55b19bad29c4bb3af8f1421516bacfd9 [2021-11-23 01:51:52,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:51:52,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:51:52,956 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:51:52,957 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:51:52,958 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:51:52,960 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_1+newton_2_7.i [2021-11-23 01:51:53,045 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/data/8fc1025ee/f750033a153a47228181a98cff559818/FLAG092f4ac0e [2021-11-23 01:51:53,502 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:51:53,503 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/sv-benchmarks/c/combinations/gcd_1+newton_2_7.i [2021-11-23 01:51:53,517 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/data/8fc1025ee/f750033a153a47228181a98cff559818/FLAG092f4ac0e [2021-11-23 01:51:53,882 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/data/8fc1025ee/f750033a153a47228181a98cff559818 [2021-11-23 01:51:53,884 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:51:53,886 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:51:53,887 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:51:53,887 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:51:53,892 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:51:53,897 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:51:53" (1/1) ... [2021-11-23 01:51:53,898 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8f7ce32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:53, skipping insertion in model container [2021-11-23 01:51:53,898 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:51:53" (1/1) ... [2021-11-23 01:51:53,905 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:51:53,927 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:51:54,103 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_95244725-e8d9-4700-866d-3bdcd65d9409/sv-benchmarks/c/combinations/gcd_1+newton_2_7.i[1226,1239] [2021-11-23 01:51:54,135 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_95244725-e8d9-4700-866d-3bdcd65d9409/sv-benchmarks/c/combinations/gcd_1+newton_2_7.i[2807,2820] [2021-11-23 01:51:54,136 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:51:54,145 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:51:54,155 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_95244725-e8d9-4700-866d-3bdcd65d9409/sv-benchmarks/c/combinations/gcd_1+newton_2_7.i[1226,1239] [2021-11-23 01:51:54,167 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_95244725-e8d9-4700-866d-3bdcd65d9409/sv-benchmarks/c/combinations/gcd_1+newton_2_7.i[2807,2820] [2021-11-23 01:51:54,169 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:51:54,183 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:51:54,184 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54 WrapperNode [2021-11-23 01:51:54,184 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:51:54,186 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:51:54,186 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:51:54,186 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:51:54,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,199 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,223 INFO L137 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2021-11-23 01:51:54,224 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:51:54,225 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:51:54,225 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:51:54,225 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:51:54,234 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,234 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,236 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,243 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,248 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,249 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:51:54,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:51:54,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:51:54,254 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:51:54,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (1/1) ... [2021-11-23 01:51:54,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:51:54,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:54,288 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:51:54,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:51:54,334 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 01:51:54,335 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 01:51:54,335 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 01:51:54,335 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 01:51:54,335 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 01:51:54,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 01:51:54,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:51:54,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:51:54,390 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:51:54,392 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:51:54,536 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:51:54,616 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:51:54,616 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 01:51:54,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:51:54 BoogieIcfgContainer [2021-11-23 01:51:54,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:51:54,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:51:54,639 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:51:54,643 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:51:54,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:51:53" (1/3) ... [2021-11-23 01:51:54,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ca9726 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:51:54, skipping insertion in model container [2021-11-23 01:51:54,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:51:54" (2/3) ... [2021-11-23 01:51:54,645 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ca9726 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:51:54, skipping insertion in model container [2021-11-23 01:51:54,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:51:54" (3/3) ... [2021-11-23 01:51:54,647 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_7.i [2021-11-23 01:51:54,656 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:51:54,663 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 01:51:54,715 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:51:54,724 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 01:51:54,724 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 01:51:54,742 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 01:51:54,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 01:51:54,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:54,746 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 01:51:54,747 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:51:54,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:54,753 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2021-11-23 01:51:54,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:51:54,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226905933] [2021-11-23 01:51:54,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:54,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:51:54,848 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 01:51:54,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [196919751] [2021-11-23 01:51:54,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:54,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:54,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:54,855 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:54,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 01:51:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:54,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:51:54,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:55,059 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 01:51:55,059 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 01:51:55,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:51:55,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226905933] [2021-11-23 01:51:55,060 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 01:51:55,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196919751] [2021-11-23 01:51:55,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196919751] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:55,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:55,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 01:51:55,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192451802] [2021-11-23 01:51:55,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:55,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:51:55,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:51:55,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:51:55,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:51:55,108 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) [2021-11-23 01:51:55,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:55,153 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-11-23 01:51:55,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:51:55,160 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 [2021-11-23 01:51:55,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:55,167 INFO L225 Difference]: With dead ends: 34 [2021-11-23 01:51:55,167 INFO L226 Difference]: Without dead ends: 21 [2021-11-23 01:51:55,170 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 [2021-11-23 01:51:55,174 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 [2021-11-23 01:51:55,185 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] [2021-11-23 01:51:55,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-23 01:51:55,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-23 01:51:55,232 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 01:51:55,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-23 01:51:55,236 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-11-23 01:51:55,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:55,236 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-23 01:51:55,237 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) [2021-11-23 01:51:55,237 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-23 01:51:55,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 01:51:55,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:55,238 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:55,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:55,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-23 01:51:55,439 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:51:55,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:55,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2021-11-23 01:51:55,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:51:55,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66977317] [2021-11-23 01:51:55,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:55,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:51:55,452 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 01:51:55,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [432649319] [2021-11-23 01:51:55,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:55,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:55,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:55,454 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:55,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 01:51:55,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:55,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:51:55,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:55,679 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 01:51:55,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:55,770 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 01:51:55,770 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:51:55,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66977317] [2021-11-23 01:51:55,772 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 01:51:55,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432649319] [2021-11-23 01:51:55,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432649319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:55,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564643862] [2021-11-23 01:51:55,819 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 01:51:55,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:51:55,824 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:51:55,830 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:51:55,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:51:56,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:51:56,371 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 [2021-11-23 01:51:56,371 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:51:56,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 01:51:56,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-11-23 01:51:56,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050206059] [2021-11-23 01:51:56,372 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:56,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:51:56,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:51:56,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:51:56,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:51:56,374 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) [2021-11-23 01:51:56,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:56,455 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-23 01:51:56,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 01:51:56,456 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 [2021-11-23 01:51:56,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:56,458 INFO L225 Difference]: With dead ends: 25 [2021-11-23 01:51:56,458 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 01:51:56,460 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 [2021-11-23 01:51:56,463 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:56,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 85 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:51:56,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 01:51:56,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 01:51:56,472 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 01:51:56,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-23 01:51:56,474 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2021-11-23 01:51:56,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:56,475 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-23 01:51:56,475 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) [2021-11-23 01:51:56,475 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-23 01:51:56,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 01:51:56,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:56,477 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:56,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:56,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:56,692 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:51:56,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:56,693 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2021-11-23 01:51:56,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:51:56,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828303441] [2021-11-23 01:51:56,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:56,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:51:56,702 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 01:51:56,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1366308060] [2021-11-23 01:51:56,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:51:56,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:56,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:56,703 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:56,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 01:52:04,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 01:52:04,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:04,956 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 01:52:04,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:54:03,317 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 [2021-11-23 01:55:16,997 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 [2021-11-23 01:56:00,063 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 [2021-11-23 01:56:02,067 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 [2021-11-23 01:56:02,068 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 01:56:02,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:11,688 WARN L227 SmtUtils]: Spent 33.40s 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) [2021-11-23 01:57:41,549 WARN L860 $PredicateComparison]: unable to prove that (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)) is different from true [2021-11-23 01:59:04,529 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 [2021-11-23 01:59:06,532 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 [2021-11-23 01:59:06,533 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 01:59:06,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:59:06,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828303441] [2021-11-23 01:59:06,533 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 01:59:06,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366308060] [2021-11-23 01:59:06,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366308060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:59:06,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512052573] [2021-11-23 01:59:06,536 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 01:59:06,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:59:06,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:59:06,537 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:59:06,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:59:06,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:59:14,451 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 [2021-11-23 01:59:14,451 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:59:14,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 01:59:14,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 14 [2021-11-23 01:59:14,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760296349] [2021-11-23 01:59:14,452 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 01:59:14,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 01:59:14,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:59:14,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 01:59:14,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=143, Unknown=12, NotChecked=140, Total=342 [2021-11-23 01:59:14,454 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) [2021-11-23 02:00:45,160 WARN L227 SmtUtils]: Spent 1.21m on a formula simplification. DAG size of input: 43 DAG size of output: 27 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:00:47,212 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse32 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse33 (mod (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse32) 256))) (let ((.cse21 (+ 256 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse34 (mod (+ (* |c_ULTIMATE.start_gcd_test_~b#1| 255) .cse32) 256)) (.cse9 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse29 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse33) 256) 0))) (.cse30 (= |c_ULTIMATE.start_main1_~y~0#1| .cse33)) (.cse31 (= .cse33 0))) (let ((.cse20 (or .cse9 .cse29 .cse30 .cse31)) (.cse8 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse34) 256) 0))) (.cse10 (= .cse34 0)) (.cse11 (= .cse34 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse12 (< 127 .cse34)) (.cse13 (<= .cse34 127)) (.cse1 (<= .cse33 127)) (.cse5 (< 127 .cse33)) (.cse6 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse15 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse34)) 256) 0))) (.cse16 (= .cse34 .cse21)) (.cse19 (<= 0 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse17 (= .cse21 .cse33)) (.cse18 (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse33)) 256)))) (.cse23 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse22 (mod .cse32 256))) (and (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 (<= .cse0 127) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0)) (and (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse0) (< 127 .cse0))))) (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 ((.cse7 (or (= .cse21 .cse22) .cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse22)) 256) 0))))) (let ((.cse4 (or (and .cse7 .cse20) .cse19)) (.cse3 (or (and .cse7 (or .cse9 .cse17 .cse18)) .cse19))) (and (or (let ((.cse2 (or .cse6 (and .cse7 (or .cse8 .cse9 .cse10 .cse11))))) (and (or .cse1 (and .cse2 .cse3)) (or (and .cse2 .cse4) .cse5))) .cse12) (or .cse13 (let ((.cse14 (or .cse6 (and .cse7 (or .cse9 .cse15 .cse16))))) (and (or (and .cse14 .cse4) .cse5) (or .cse1 (and .cse3 .cse14)))))))) (<= .cse22 127)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (or (< 127 .cse22) (let ((.cse26 (or .cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse22) 256) 0)) (= |c_ULTIMATE.start_main1_~y~0#1| .cse22) (= 0 .cse22))) (.cse27 (= .cse32 0))) (let ((.cse24 (or .cse19 (and .cse26 (or .cse9 .cse17 .cse18 .cse27))))) (and (or (let ((.cse25 (or .cse6 (and .cse26 (or .cse8 .cse9 .cse10 .cse11 .cse27))))) (and (or .cse1 (and .cse24 .cse25)) (or (and (or (and .cse26 .cse20) .cse19) .cse25) .cse5))) .cse12) (or .cse13 (let ((.cse28 (or .cse6 (and (or .cse9 .cse15 .cse16 .cse27) .cse26)))) (and (or .cse1 (and .cse28 .cse24)) (or (and (or .cse19 (and (or .cse9 .cse29 .cse30 .cse31 .cse27) .cse26)) .cse28) .cse5))))))))))))) is different from false [2021-11-23 02:01:30,275 WARN L227 SmtUtils]: Spent 39.31s on a formula simplification. DAG size of input: 50 DAG size of output: 46 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:01:32,907 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 [2021-11-23 02:01:33,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:33,016 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-23 02:01:33,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:01:33,017 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 [2021-11-23 02:01:33,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:33,017 INFO L225 Difference]: With dead ends: 26 [2021-11-23 02:01:33,018 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 02:01:33,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 7 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 204.0s TimeCoverageRelationStatistics Valid=59, Invalid=187, Unknown=22, NotChecked=238, Total=506 [2021-11-23 02:01:33,020 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:33,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 110 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 69 Unchecked, 0.8s Time] [2021-11-23 02:01:33,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 02:01:33,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 02:01:33,027 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) [2021-11-23 02:01:33,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-23 02:01:33,028 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2021-11-23 02:01:33,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:33,029 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-23 02:01:33,029 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) [2021-11-23 02:01:33,029 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-23 02:01:33,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:01:33,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:33,030 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-11-23 02:01:33,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:33,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:33,239 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:33,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:33,240 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2021-11-23 02:01:33,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:33,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089934027] [2021-11-23 02:01:33,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:33,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:33,248 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:01:33,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [697454988] [2021-11-23 02:01:33,249 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:01:33,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:33,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:01:33,250 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:01:33,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95244725-e8d9-4700-866d-3bdcd65d9409/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:01:43,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:01:43,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:01:43,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 02:01:43,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:37,131 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