./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_3+newton_2_4.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_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/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_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_3+newton_2_4.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/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_6426d68b-dfc1-45e2-9009-9b99434c8e57/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 1d3494a64b97ff198f649db9990f4b24e7ade2324c824b5bf3f291e4c895b3e7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:37:31,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:37:31,383 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:37:31,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:37:31,442 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:37:31,446 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:37:31,448 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:37:31,454 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:37:31,457 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:37:31,463 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:37:31,464 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:37:31,467 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:37:31,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:37:31,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:37:31,473 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:37:31,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:37:31,480 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:37:31,481 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:37:31,484 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:37:31,494 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:37:31,496 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:37:31,498 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:37:31,502 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:37:31,503 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:37:31,514 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:37:31,514 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:37:31,515 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:37:31,517 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:37:31,518 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:37:31,520 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:37:31,520 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:37:31,521 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:37:31,524 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:37:31,526 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:37:31,528 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:37:31,528 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:37:31,529 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:37:31,529 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:37:31,530 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:37:31,531 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:37:31,532 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:37:31,533 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:37:31,584 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:37:31,584 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:37:31,585 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:37:31,585 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:37:31,593 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:37:31,593 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:37:31,594 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:37:31,594 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:37:31,594 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:37:31,595 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:37:31,596 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:37:31,596 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:37:31,596 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:37:31,597 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:37:31,597 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:37:31,597 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:37:31,598 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:37:31,598 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:37:31,599 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:37:31,599 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:37:31,599 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:37:31,599 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:37:31,600 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:37:31,600 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:37:31,600 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:37:31,600 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:37:31,603 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:37:31,603 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:37:31,604 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:37:31,604 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:37:31,604 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:37:31,605 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:37:31,605 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:37:31,605 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:37:31,605 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:37:31,606 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:37:31,606 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:37:31,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:37:31,606 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:37:31,607 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:37:31,607 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:37:31,607 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_6426d68b-dfc1-45e2-9009-9b99434c8e57/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1d3494a64b97ff198f649db9990f4b24e7ade2324c824b5bf3f291e4c895b3e7 [2021-11-23 03:37:31,893 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:37:31,930 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:37:31,934 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:37:31,936 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:37:31,937 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:37:31,939 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_3+newton_2_4.i [2021-11-23 03:37:32,031 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/data/593ab8df5/4da4ea09007f4ed988e0005c6a630ae4/FLAG2fb83fed3 [2021-11-23 03:37:32,568 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:37:32,573 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/sv-benchmarks/c/combinations/gcd_3+newton_2_4.i [2021-11-23 03:37:32,587 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/data/593ab8df5/4da4ea09007f4ed988e0005c6a630ae4/FLAG2fb83fed3 [2021-11-23 03:37:32,916 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/data/593ab8df5/4da4ea09007f4ed988e0005c6a630ae4 [2021-11-23 03:37:32,922 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:37:32,925 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:37:32,932 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:37:32,932 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:37:32,937 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:37:32,938 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:37:32" (1/1) ... [2021-11-23 03:37:32,941 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b4fba05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:32, skipping insertion in model container [2021-11-23 03:37:32,942 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:37:32" (1/1) ... [2021-11-23 03:37:32,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:37:32,983 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:37:33,262 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_6426d68b-dfc1-45e2-9009-9b99434c8e57/sv-benchmarks/c/combinations/gcd_3+newton_2_4.i[1226,1239] [2021-11-23 03:37:33,296 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_6426d68b-dfc1-45e2-9009-9b99434c8e57/sv-benchmarks/c/combinations/gcd_3+newton_2_4.i[2841,2854] [2021-11-23 03:37:33,298 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:37:33,308 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:37:33,323 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_6426d68b-dfc1-45e2-9009-9b99434c8e57/sv-benchmarks/c/combinations/gcd_3+newton_2_4.i[1226,1239] [2021-11-23 03:37:33,338 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_6426d68b-dfc1-45e2-9009-9b99434c8e57/sv-benchmarks/c/combinations/gcd_3+newton_2_4.i[2841,2854] [2021-11-23 03:37:33,342 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:37:33,362 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:37:33,363 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33 WrapperNode [2021-11-23 03:37:33,363 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:37:33,364 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:37:33,364 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:37:33,365 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:37:33,374 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,392 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,420 INFO L137 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2021-11-23 03:37:33,421 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:37:33,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:37:33,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:37:33,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:37:33,432 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,434 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,435 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,442 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:37:33,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:37:33,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:37:33,453 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:37:33,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (1/1) ... [2021-11-23 03:37:33,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:37:33,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:33,491 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:37:33,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:37:33,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:37:33,549 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 03:37:33,550 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 03:37:33,550 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 03:37:33,550 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 03:37:33,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:37:33,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:37:33,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:37:33,652 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:37:33,654 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:37:33,977 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:37:34,067 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:37:34,067 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:37:34,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:37:34 BoogieIcfgContainer [2021-11-23 03:37:34,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:37:34,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:37:34,076 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:37:34,081 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:37:34,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:37:32" (1/3) ... [2021-11-23 03:37:34,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9ba8f1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:37:34, skipping insertion in model container [2021-11-23 03:37:34,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:37:33" (2/3) ... [2021-11-23 03:37:34,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9ba8f1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:37:34, skipping insertion in model container [2021-11-23 03:37:34,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:37:34" (3/3) ... [2021-11-23 03:37:34,090 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_3+newton_2_4.i [2021-11-23 03:37:34,097 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:37:34,098 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:37:34,181 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:37:34,196 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 03:37:34,196 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:37:34,229 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 03:37:34,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:37:34,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:34,236 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:37:34,236 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:34,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:34,243 INFO L85 PathProgramCache]: Analyzing trace with hash -499021812, now seen corresponding path program 1 times [2021-11-23 03:37:34,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:34,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615428615] [2021-11-23 03:37:34,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:34,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:34,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:34,614 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 03:37:34,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:34,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615428615] [2021-11-23 03:37:34,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615428615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:34,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:37:34,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:37:34,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248836381] [2021-11-23 03:37:34,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:34,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:37:34,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:34,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:37:34,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:37:34,673 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 03:37:34,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:34,840 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-11-23 03:37:34,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:37:34,843 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 03:37:34,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:34,851 INFO L225 Difference]: With dead ends: 45 [2021-11-23 03:37:34,851 INFO L226 Difference]: Without dead ends: 21 [2021-11-23 03:37:34,855 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 03:37:34,859 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 03:37:34,861 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 03:37:34,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-23 03:37:34,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-23 03:37:34,900 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 03:37:34,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-23 03:37:34,903 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-11-23 03:37:34,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:34,903 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-23 03:37:34,904 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 03:37:34,904 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-23 03:37:34,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:37:34,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:34,905 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:37:34,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:37:34,906 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:34,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:34,907 INFO L85 PathProgramCache]: Analyzing trace with hash 1643785969, now seen corresponding path program 1 times [2021-11-23 03:37:34,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:34,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827509961] [2021-11-23 03:37:34,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:34,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:34,924 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:37:34,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [33732583] [2021-11-23 03:37:34,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:34,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:34,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:34,928 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:34,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:37:35,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:35,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:37:35,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:50,381 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 03:37:50,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:37:59,476 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 03:37:59,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:59,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827509961] [2021-11-23 03:37:59,477 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:37:59,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33732583] [2021-11-23 03:37:59,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33732583] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:37:59,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1846323871] [2021-11-23 03:37:59,500 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 03:37:59,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:37:59,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:37:59,511 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:37:59,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:38:02,632 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:38:15,499 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 03:38:15,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:38:15,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:38:15,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-23 03:38:15,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453020285] [2021-11-23 03:38:15,501 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:15,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:38:15,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:15,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:38:15,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=142, Unknown=5, NotChecked=0, Total=182 [2021-11-23 03:38:15,504 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 03:39:05,439 WARN L227 SmtUtils]: Spent 48.48s 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 03:39:05,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:05,691 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-23 03:39:05,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:39:05,692 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 03:39:05,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:05,693 INFO L225 Difference]: With dead ends: 26 [2021-11-23 03:39:05,693 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 03:39:05,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 78.4s TimeCoverageRelationStatistics Valid=41, Invalid=164, Unknown=5, NotChecked=0, Total=210 [2021-11-23 03:39:05,696 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:05,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 83 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 10 Unchecked, 0.4s Time] [2021-11-23 03:39:05,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 03:39:05,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 03:39:05,703 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 03:39:05,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-23 03:39:05,705 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2021-11-23 03:39:05,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:05,724 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-23 03:39:05,725 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 03:39:05,725 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-23 03:39:05,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:39:05,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:05,726 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 03:39:05,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:05,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:05,929 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:39:05,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:05,932 INFO L85 PathProgramCache]: Analyzing trace with hash -648649556, now seen corresponding path program 2 times [2021-11-23 03:39:05,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:05,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874557679] [2021-11-23 03:39:05,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:05,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:05,945 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:39:05,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [21389033] [2021-11-23 03:39:05,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:39:05,946 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:05,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:05,947 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:05,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:39:06,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:39:06,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:39:06,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 03:39:06,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:49,841 WARN L227 SmtUtils]: Spent 14.99s on a formula simplification. DAG size of input: 113 DAG size of output: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:40:10,236 WARN L838 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_gcd_test_~b#1_24| Int)) (and (let ((.cse0 (+ 256 |c_ULTIMATE.start_main1_~g~0#1|))) (or (and (< |c_ULTIMATE.start_main1_~x~0#1| 0) (let ((.cse2 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (or (let ((.cse1 (mod (+ (- 256) .cse2) |v_ULTIMATE.start_gcd_test_~b#1_24|))) (and (or (and (<= .cse0 (mod (+ .cse1 |v_ULTIMATE.start_gcd_test_~b#1_24|) 256)) (< |v_ULTIMATE.start_gcd_test_~b#1_24| 0) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_27| (+ (- 256) (mod (+ (mod (+ (- 256) (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256)) |v_ULTIMATE.start_gcd_test_~b#1_24|) |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) 256) 0))) (and (<= .cse0 (mod (+ (* |v_ULTIMATE.start_gcd_test_~b#1_24| 255) .cse1) 256)) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_27| (+ (mod (+ (* |v_ULTIMATE.start_gcd_test_~b#1_24| 255) (mod (+ (- 256) (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256)) |v_ULTIMATE.start_gcd_test_~b#1_24|)) 256) (- 256))) 256) 0)) (<= 0 |v_ULTIMATE.start_gcd_test_~b#1_24|))) (< 127 .cse2) (not (= .cse1 0)))) (let ((.cse3 (mod (mod .cse2 |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) (and (<= |c_ULTIMATE.start_main1_~g~0#1| .cse3) (<= .cse2 127) (not (= .cse3 0)) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_27| (mod (mod (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~b#1_24|) 256)) 256) 0))))))) (and (let ((.cse4 (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) (or (and (not (= .cse4 0)) (<= |c_ULTIMATE.start_main1_~g~0#1| .cse4) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_27| (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~b#1_24|) 256)) 256) 0)) (<= .cse4 127)) (and (< 127 .cse4) (<= .cse0 .cse4) (exists ((|v_ULTIMATE.start_gcd_test_~a#1_27| Int)) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_27| (+ (- 256) (mod (mod |c_ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~b#1_24|) 256))) 256) 0))))) (<= 0 |c_ULTIMATE.start_main1_~x~0#1|)))) (not (= |v_ULTIMATE.start_gcd_test_~b#1_24| 0)))) is different from false [2021-11-23 03:40:11,819 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:40:11,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:40:42,017 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 03:40:42,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:40:42,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874557679] [2021-11-23 03:40:42,017 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:40:42,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21389033] [2021-11-23 03:40:42,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21389033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:40:42,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1785674040] [2021-11-23 03:40:42,021 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 03:40:42,021 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:40:42,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:40:42,022 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:40:42,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:40:42,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:40:55,853 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 03:40:55,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:40:55,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:40:55,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-11-23 03:40:55,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301074476] [2021-11-23 03:40:55,854 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:40:55,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:40:55,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:40:55,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:40:55,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=158, Unknown=9, NotChecked=26, Total=240 [2021-11-23 03:40:55,856 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 03:41:21,958 WARN L227 SmtUtils]: Spent 17.28s 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 03:41:50,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:50,018 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-11-23 03:41:50,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:41:50,020 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 03:41:50,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:50,021 INFO L225 Difference]: With dead ends: 30 [2021-11-23 03:41:50,021 INFO L226 Difference]: Without dead ends: 25 [2021-11-23 03:41:50,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 110.6s TimeCoverageRelationStatistics Valid=61, Invalid=231, Unknown=18, NotChecked=32, Total=342 [2021-11-23 03:41:50,024 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:50,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 97 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 15 Unchecked, 0.2s Time] [2021-11-23 03:41:50,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-23 03:41:50,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-23 03:41:50,032 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 03:41:50,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-11-23 03:41:50,033 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 8 [2021-11-23 03:41:50,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:50,034 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-11-23 03:41:50,034 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 03:41:50,034 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-11-23 03:41:50,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 03:41:50,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:50,035 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:50,061 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 03:41:50,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:50,236 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:50,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:50,237 INFO L85 PathProgramCache]: Analyzing trace with hash 1916224945, now seen corresponding path program 3 times [2021-11-23 03:41:50,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:50,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530006500] [2021-11-23 03:41:50,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:50,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:50,252 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:41:50,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1488878814] [2021-11-23 03:41:50,252 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:41:50,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:50,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:50,288 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:50,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6426d68b-dfc1-45e2-9009-9b99434c8e57/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:41:50,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:41:50,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:41:50,701 WARN L261 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-23 03:41:50,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:22,261 WARN L227 SmtUtils]: Spent 22.24s 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 03:45:20,087 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 03:51:32,337 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