./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/gcd_1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/gcd_1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 739715c3f9b6cd78741b6d155210624f17d4bf167a3be4c6127f06707080edde --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:55:31,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:55:31,094 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:55:31,135 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:55:31,135 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:55:31,137 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:55:31,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:55:31,145 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:55:31,148 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:55:31,149 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:55:31,150 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:55:31,154 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:55:31,154 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:55:31,160 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:55:31,162 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:55:31,164 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:55:31,166 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:55:31,169 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:55:31,173 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:55:31,178 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:55:31,186 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:55:31,187 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:55:31,189 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:55:31,191 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:55:31,198 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:55:31,202 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:55:31,203 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:55:31,204 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:55:31,205 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:55:31,207 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:55:31,208 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:55:31,209 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:55:31,211 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:55:31,212 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:55:31,214 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:55:31,214 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:55:31,215 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:55:31,215 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:55:31,215 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:55:31,216 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:55:31,217 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:55:31,218 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:55:31,257 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:55:31,258 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:55:31,258 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:55:31,258 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:55:31,259 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:55:31,259 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:55:31,259 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:55:31,260 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:55:31,260 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:55:31,260 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:55:31,260 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:55:31,261 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:55:31,261 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:55:31,261 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:55:31,261 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:55:31,261 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:55:31,262 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:55:31,262 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:55:31,263 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:55:31,263 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:55:31,263 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:55:31,263 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:55:31,264 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:55:31,264 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:55:31,264 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:55:31,264 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:55:31,264 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:55:31,265 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:55:31,265 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:55:31,265 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:55:31,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:55:31,266 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:55:31,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:55:31,266 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:55:31,266 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:55:31,267 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:55:31,267 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:55:31,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:55:31,267 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:55:31,267 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:55:31,268 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:55:31,268 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_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 739715c3f9b6cd78741b6d155210624f17d4bf167a3be4c6127f06707080edde [2021-11-25 18:55:31,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:55:31,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:55:31,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:55:31,585 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:55:31,586 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:55:31,587 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/bitvector/gcd_1.c [2021-11-25 18:55:31,693 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/data/7c68c9565/afe81c84a2fb4006b03f531c27dfedc5/FLAG2a17b5f35 [2021-11-25 18:55:32,222 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:55:32,224 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/sv-benchmarks/c/bitvector/gcd_1.c [2021-11-25 18:55:32,234 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/data/7c68c9565/afe81c84a2fb4006b03f531c27dfedc5/FLAG2a17b5f35 [2021-11-25 18:55:32,591 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/data/7c68c9565/afe81c84a2fb4006b03f531c27dfedc5 [2021-11-25 18:55:32,596 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:55:32,598 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:55:32,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:55:32,600 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:55:32,604 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:55:32,605 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,606 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cbd6323 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32, skipping insertion in model container [2021-11-25 18:55:32,606 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,613 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:55:32,628 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:55:32,807 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_bc9e20b1-8f04-4f9d-8584-f74bbb212490/sv-benchmarks/c/bitvector/gcd_1.c[664,677] [2021-11-25 18:55:32,826 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:55:32,837 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:55:32,852 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_bc9e20b1-8f04-4f9d-8584-f74bbb212490/sv-benchmarks/c/bitvector/gcd_1.c[664,677] [2021-11-25 18:55:32,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:55:32,887 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:55:32,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32 WrapperNode [2021-11-25 18:55:32,888 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:55:32,890 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:55:32,890 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:55:32,890 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:55:32,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,908 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,935 INFO L137 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 47 [2021-11-25 18:55:32,936 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:55:32,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:55:32,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:55:32,937 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:55:32,946 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,946 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,947 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,948 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,955 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,956 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,958 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:55:32,959 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:55:32,959 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:55:32,959 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:55:32,960 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (1/1) ... [2021-11-25 18:55:32,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:55:32,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:32,991 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:55:32,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:55:33,033 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:55:33,033 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:55:33,034 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:55:33,034 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:55:33,100 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:55:33,102 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:55:33,292 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:55:33,339 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:55:33,344 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:55:33,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:55:33 BoogieIcfgContainer [2021-11-25 18:55:33,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:55:33,348 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:55:33,348 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:55:33,351 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:55:33,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:55:32" (1/3) ... [2021-11-25 18:55:33,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e9d75b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:55:33, skipping insertion in model container [2021-11-25 18:55:33,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:32" (2/3) ... [2021-11-25 18:55:33,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e9d75b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:55:33, skipping insertion in model container [2021-11-25 18:55:33,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:55:33" (3/3) ... [2021-11-25 18:55:33,355 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_1.c [2021-11-25 18:55:33,360 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:55:33,361 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:55:33,410 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:55:33,418 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:55:33,418 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:55:33,431 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 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) [2021-11-25 18:55:33,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 18:55:33,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:33,437 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 18:55:33,438 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:33,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:33,444 INFO L85 PathProgramCache]: Analyzing trace with hash 77541297, now seen corresponding path program 1 times [2021-11-25 18:55:33,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:33,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117752915] [2021-11-25 18:55:33,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:33,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:33,569 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:55:33,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1671175218] [2021-11-25 18:55:33,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:33,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:33,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:33,572 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:33,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:55:33,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:33,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:55:33,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:33,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:33,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:33,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:33,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117752915] [2021-11-25 18:55:33,895 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:55:33,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671175218] [2021-11-25 18:55:33,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671175218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:33,896 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:33,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:55:33,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182029014] [2021-11-25 18:55:33,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:33,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:55:33,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:33,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:55:33,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:33,933 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 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) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:33,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:33,980 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-25 18:55:33,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:55:33,984 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2021-11-25 18:55:33,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:33,992 INFO L225 Difference]: With dead ends: 16 [2021-11-25 18:55:33,992 INFO L226 Difference]: Without dead ends: 7 [2021-11-25 18:55:33,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:34,003 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:34,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:34,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2021-11-25 18:55:34,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2021-11-25 18:55:34,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:34,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2021-11-25 18:55:34,034 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2021-11-25 18:55:34,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:34,034 INFO L470 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2021-11-25 18:55:34,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:34,035 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2021-11-25 18:55:34,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:55:34,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:34,035 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:55:34,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:55:34,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 18:55:34,249 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:34,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:34,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1892089494, now seen corresponding path program 1 times [2021-11-25 18:55:34,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:34,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116800245] [2021-11-25 18:55:34,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:34,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:34,264 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:55:34,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [58969169] [2021-11-25 18:55:34,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:34,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:34,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:34,310 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:34,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:55:34,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:34,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:55:34,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:34,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:34,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:34,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:34,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:34,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116800245] [2021-11-25 18:55:34,569 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:55:34,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58969169] [2021-11-25 18:55:34,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58969169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:34,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543985730] [2021-11-25 18:55:34,590 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 18:55:34,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:34,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:34,601 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:34,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:34,847 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:55:35,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main_~y~0#1|) (<= |ULTIMATE.start_main_~y~0#1| 127) (= |ULTIMATE.start_main_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~g~0#1| |ULTIMATE.start_main_~y~0#1|) 1 0)) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:55:35,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:55:35,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:55:35,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-11-25 18:55:35,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981867368] [2021-11-25 18:55:35,064 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:35,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:55:35,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:35,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:55:35,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:55:35,067 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:35,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:35,123 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2021-11-25 18:55:35,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:55:35,123 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:55:35,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:35,124 INFO L225 Difference]: With dead ends: 11 [2021-11-25 18:55:35,124 INFO L226 Difference]: Without dead ends: 8 [2021-11-25 18:55:35,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:55:35,127 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:35,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 11 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:35,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-25 18:55:35,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-25 18:55:35,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:35,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2021-11-25 18:55:35,131 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2021-11-25 18:55:35,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:35,132 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2021-11-25 18:55:35,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:35,133 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2021-11-25 18:55:35,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:55:35,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:35,133 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-25 18:55:35,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 18:55:35,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:35,357 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:35,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:35,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1473865425, now seen corresponding path program 2 times [2021-11-25 18:55:35,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:35,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006069790] [2021-11-25 18:55:35,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:35,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:35,368 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:55:35,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1179633564] [2021-11-25 18:55:35,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:55:35,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:35,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:35,370 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:35,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:55:48,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:55:48,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:55:48,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 18:55:48,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:00:47,173 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (exists ((|ULTIMATE.start_main_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_26| Int)) (and (= (mod |ULTIMATE.start_main_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_26|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_26|) 256)) (< |ULTIMATE.start_main_~x~0#1| 0) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_26| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_26|)))) is different from false [2021-11-25 19:01:31,039 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_26| Int)) (let ((.cse0 (mod (mod (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_26|) 256))) (and (= (mod |ULTIMATE.start_main_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_26|) 0) (< |ULTIMATE.start_main_~x~0#1| 0) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_26| .cse0) 256) 0) (not (= .cse0 0)) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_26|)))) is different from false [2021-11-25 19:01:33,043 WARN L860 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_26| Int)) (let ((.cse0 (mod (mod (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_26|) 256))) (and (= (mod |ULTIMATE.start_main_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_26|) 0) (< |ULTIMATE.start_main_~x~0#1| 0) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_26| .cse0) 256) 0) (not (= .cse0 0)) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_26|)))) is different from true [2021-11-25 19:02:16,035 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-25 19:02:16,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:37,443 WARN L227 SmtUtils]: Spent 51.30s on a formula simplification that was a NOOP. DAG size: 114 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:03:57,448 WARN L860 $PredicateComparison]: unable to prove that (or (<= 0 |c_ULTIMATE.start_main_~x~0#1|) (not (= (mod |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~y~0#1|) 0)) (<= |c_ULTIMATE.start_main_~y~0#1| 0) (let ((.cse2 (mod (* |c_ULTIMATE.start_main_~x~0#1| 255) 256))) (and (or (let ((.cse1 (mod (+ .cse2 (- 256)) |c_ULTIMATE.start_main_~y~0#1|))) (let ((.cse0 (not (= (mod (mod |c_ULTIMATE.start_main_~y~0#1| (+ (- 256) (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| 255) .cse1) 256))) 256) 0)))) (and (or .cse0 (<= (mod .cse1 256) 127)) (or .cse0 (= .cse1 0))))) (<= .cse2 127)) (let ((.cse3 (mod (mod .cse2 |c_ULTIMATE.start_main_~y~0#1|) 256))) (or (= .cse3 0) (not (= (mod (mod |c_ULTIMATE.start_main_~y~0#1| .cse3) 256) 0)) (< 127 .cse2)))))) is different from true [2021-11-25 19:03:57,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:57,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:57,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006069790] [2021-11-25 19:03:57,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:03:57,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179633564] [2021-11-25 19:03:57,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179633564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:57,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [109873441] [2021-11-25 19:03:57,453 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 19:03:57,453 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:03:57,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:03:57,454 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:03:57,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:03:57,559 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:04:01,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '173#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main_~y~0#1|) (<= |ULTIMATE.start_main_~y~0#1| 127) (= |ULTIMATE.start_main_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#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___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~g~0#1| |ULTIMATE.start_main_~y~0#1|) 1 0)) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:04:01,715 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:04:01,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:04:01,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 10 [2021-11-25 19:04:01,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038951649] [2021-11-25 19:04:01,716 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:04:01,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:04:01,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:04:01,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:04:01,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=98, Unknown=9, NotChecked=66, Total=210 [2021-11-25 19:04:01,718 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:01,093 WARN L227 SmtUtils]: Spent 45.82s on a formula simplification. DAG size of input: 49 DAG size of output: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:05:03,141 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse27 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse28 (mod (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse27) 256)) (.cse29 (mod (+ (* |c_ULTIMATE.start_gcd_test_~b#1| 255) .cse27) 256))) (let ((.cse21 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse29) 256) 0))) (.cse22 (= .cse29 0)) (.cse7 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse25 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse28) 256) 0))) (.cse26 (= .cse28 0))) (let ((.cse14 (< 127 .cse29)) (.cse17 (or .cse7 .cse25 .cse26)) (.cse13 (or .cse21 .cse7 .cse22)) (.cse4 (< 127 .cse28)) (.cse5 (<= .cse28 127)) (.cse10 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse8 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse29)) 256) 0))) (.cse11 (<= .cse29 127)) (.cse15 (<= 0 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse16 (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse28)) 256)))) (.cse18 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse1 (mod .cse27 256))) (and (<= |c_ULTIMATE.start_main_~x~0#1| 127) (<= |c_ULTIMATE.start_main_~y~0#1| 127) (exists ((|ULTIMATE.start_main_~x~0#1| Int)) (and (<= |ULTIMATE.start_main_~x~0#1| 127) (= (mod |ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_gcd_test_~b#1|) 0) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (or (and (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |c_ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_main_~x~0#1|)) (and (< |ULTIMATE.start_main_~x~0#1| 0) (let ((.cse0 (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256))) (or (and (= .cse0 (+ |c_ULTIMATE.start_gcd_test_~a#1| 256)) (< 127 .cse0)) (and (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0) (<= .cse0 127)))))))) (<= |c_ULTIMATE.start_gcd_test_~b#1| 127) (<= 0 (+ |c_ULTIMATE.start_main_~x~0#1| 128)) (< 0 |c_ULTIMATE.start_gcd_test_~b#1|) (or (<= .cse1 127) (let ((.cse9 (or .cse18 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse1)) 256) 0))))) (let ((.cse3 (or .cse15 (and .cse9 .cse17))) (.cse6 (or .cse15 (and .cse9 (or .cse7 .cse16))))) (and (or (let ((.cse2 (or (and (or .cse7 .cse8) .cse9) .cse10))) (and (or (and .cse2 .cse3) .cse4) (or .cse5 (and .cse2 .cse6)))) .cse11) (or (let ((.cse12 (or .cse10 (and .cse9 .cse13)))) (and (or (and .cse12 .cse3) .cse4) (or .cse5 (and .cse12 .cse6)))) .cse14))))) (or (< 127 .cse1) (let ((.cse20 (or .cse18 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse1) 256) 0)) (= 0 .cse1))) (.cse23 (= .cse27 0))) (let ((.cse19 (or .cse15 (and .cse20 (or .cse7 .cse16 .cse23))))) (and (or .cse14 (and (or .cse5 (and .cse19 (or .cse10 (and .cse20 (or .cse21 .cse7 .cse22 .cse23))))) (or (and (or (and .cse20 .cse17) .cse15) (or .cse10 (and .cse20 .cse13))) .cse4))) (or (let ((.cse24 (or .cse10 (and .cse20 (or .cse7 .cse8 .cse23))))) (and (or (and .cse24 (or .cse15 (and (or .cse7 .cse25 .cse26 .cse23) .cse20))) .cse4) (or .cse5 (and .cse19 .cse24)))) .cse11)))))))))) is different from false [2021-11-25 19:05:05,171 WARN L838 $PredicateComparison]: unable to prove that (and (or (= |c_ULTIMATE.start_gcd_test_~b#1| 0) (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) 256))) (< (+ |c_ULTIMATE.start_gcd_test_~b#1| 128) 0) (< 127 |c_ULTIMATE.start_gcd_test_~b#1|)) (<= |c_ULTIMATE.start_gcd_test_~a#1| 127) (< 0 |c_ULTIMATE.start_gcd_test_~a#1|) (exists ((|ULTIMATE.start_main_~x~0#1| Int)) (let ((.cse1 (mod |ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_gcd_test_~a#1|))) (and (<= |ULTIMATE.start_main_~x~0#1| 127) (or (and (< |ULTIMATE.start_main_~x~0#1| 0) (let ((.cse0 (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256))) (or (= (mod (mod .cse0 |c_ULTIMATE.start_gcd_test_~a#1|) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (and (< 127 .cse0) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod (+ .cse0 (- 256)) |c_ULTIMATE.start_gcd_test_~a#1|) 256)))))) (and (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod .cse1 256)))) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (= .cse1 0))))) is different from false [2021-11-25 19:05:07,178 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (exists ((|ULTIMATE.start_main_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_26| Int)) (and (= (mod |ULTIMATE.start_main_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_26|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_26|) 256)) (< |ULTIMATE.start_main_~x~0#1| 0) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_26| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_26|))) (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))) is different from false [2021-11-25 19:05:07,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:07,187 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2021-11-25 19:05:07,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:05:07,188 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:05:07,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:07,189 INFO L225 Difference]: With dead ends: 12 [2021-11-25 19:05:07,189 INFO L226 Difference]: Without dead ends: 9 [2021-11-25 19:05:07,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 6 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 140.8s TimeCoverageRelationStatistics Valid=46, Invalid=116, Unknown=18, NotChecked=162, Total=342 [2021-11-25 19:05:07,191 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:07,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 20 Unchecked, 0.2s Time] [2021-11-25 19:05:07,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-25 19:05:07,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-25 19:05:07,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:07,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-25 19:05:07,195 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2021-11-25 19:05:07,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:07,195 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-25 19:05:07,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:07,196 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-25 19:05:07,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:05:07,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:07,196 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1] [2021-11-25 19:05:07,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:07,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:07,403 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:07,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:07,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1555714486, now seen corresponding path program 3 times [2021-11-25 19:05:07,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:07,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075064993] [2021-11-25 19:05:07,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:07,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:07,412 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:05:07,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977649907] [2021-11-25 19:05:07,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:05:07,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:05:07,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:07,422 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:05:07,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc9e20b1-8f04-4f9d-8584-f74bbb212490/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:05:10,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:05:10,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:05:10,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 19:05:10,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:08:15,132 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (exists ((|ULTIMATE.start_main_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (and (= (mod (mod (mod (* |ULTIMATE.start_main_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256) |c_ULTIMATE.start_gcd_test_~a#1|) (< |ULTIMATE.start_main_~x~0#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0) (<= 0 (+ |ULTIMATE.start_main_~x~0#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|)))) is different from false