./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 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/gcd_1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P --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 0.2.1-dev-53f42b1 [2021-11-20 22:49:22,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:49:22,141 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:49:22,196 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:49:22,196 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:49:22,200 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:49:22,202 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:49:22,205 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:49:22,208 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:49:22,213 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:49:22,214 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:49:22,216 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:49:22,216 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:49:22,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:49:22,221 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:49:22,225 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:49:22,227 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:49:22,228 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:49:22,230 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:49:22,237 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:49:22,238 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:49:22,240 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:49:22,243 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:49:22,244 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:49:22,253 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:49:22,253 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:49:22,254 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:49:22,256 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:49:22,256 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:49:22,258 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:49:22,258 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:49:22,259 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:49:22,261 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:49:22,262 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:49:22,263 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:49:22,264 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:49:22,264 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:49:22,265 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:49:22,265 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:49:22,266 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:49:22,266 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:49:22,268 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:49:22,311 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:49:22,311 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:49:22,312 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:49:22,312 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:49:22,313 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:49:22,313 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:49:22,313 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:49:22,314 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:49:22,314 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:49:22,314 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:49:22,315 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:49:22,315 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:49:22,316 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:49:22,316 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:49:22,316 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:49:22,316 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:49:22,317 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:49:22,317 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:49:22,318 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:49:22,318 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:49:22,318 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:49:22,319 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:49:22,319 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:49:22,319 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:49:22,319 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:49:22,319 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:49:22,321 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:49:22,321 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:49:22,321 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:49:22,322 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:49:22,322 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:49:22,322 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:49:22,322 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:22,323 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:49:22,323 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:49:22,323 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:49:22,323 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:49:22,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:49:22,324 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:49:22,324 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:49:22,324 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:49:22,324 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_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 739715c3f9b6cd78741b6d155210624f17d4bf167a3be4c6127f06707080edde [2021-11-20 22:49:22,615 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:49:22,640 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:49:22,644 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:49:22,645 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:49:22,646 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:49:22,647 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector/gcd_1.c [2021-11-20 22:49:22,719 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/data/cb487906e/7c9ed8be8072423f8640c3965d6c158b/FLAGce5c776f9 [2021-11-20 22:49:23,222 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:49:23,223 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/sv-benchmarks/c/bitvector/gcd_1.c [2021-11-20 22:49:23,229 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/data/cb487906e/7c9ed8be8072423f8640c3965d6c158b/FLAGce5c776f9 [2021-11-20 22:49:23,614 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/data/cb487906e/7c9ed8be8072423f8640c3965d6c158b [2021-11-20 22:49:23,616 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:49:23,619 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:49:23,623 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:23,623 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:49:23,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:49:23,627 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20f3a394 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23, skipping insertion in model container [2021-11-20 22:49:23,630 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,637 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:49:23,653 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:49:23,808 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_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/sv-benchmarks/c/bitvector/gcd_1.c[664,677] [2021-11-20 22:49:23,821 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:23,827 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:49:23,836 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_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/sv-benchmarks/c/bitvector/gcd_1.c[664,677] [2021-11-20 22:49:23,840 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:49:23,853 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:49:23,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23 WrapperNode [2021-11-20 22:49:23,854 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:49:23,855 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:23,855 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:49:23,855 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:49:23,862 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,868 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,887 INFO L137 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 47 [2021-11-20 22:49:23,887 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:49:23,888 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:49:23,888 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:49:23,888 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:49:23,896 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,898 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,898 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,901 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,905 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,906 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:49:23,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:49:23,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:49:23,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:49:23,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (1/1) ... [2021-11-20 22:49:23,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:49:23,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:23,942 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:49:23,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:49:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:49:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:49:24,002 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:49:24,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:49:24,057 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:49:24,059 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:49:24,164 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:49:24,198 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:49:24,198 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 22:49:24,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:24 BoogieIcfgContainer [2021-11-20 22:49:24,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:49:24,202 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:49:24,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:49:24,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:49:24,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:49:23" (1/3) ... [2021-11-20 22:49:24,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e733156 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:24, skipping insertion in model container [2021-11-20 22:49:24,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:49:23" (2/3) ... [2021-11-20 22:49:24,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e733156 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:49:24, skipping insertion in model container [2021-11-20 22:49:24,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:49:24" (3/3) ... [2021-11-20 22:49:24,209 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_1.c [2021-11-20 22:49:24,214 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:49:24,215 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:49:24,258 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:49:24,264 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 [2021-11-20 22:49:24,265 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:49:24,277 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) [2021-11-20 22:49:24,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 22:49:24,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:24,288 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 22:49:24,289 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:24,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:24,293 INFO L85 PathProgramCache]: Analyzing trace with hash 77541297, now seen corresponding path program 1 times [2021-11-20 22:49:24,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:24,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237218409] [2021-11-20 22:49:24,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:24,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:24,371 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 22:49:24,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [288635438] [2021-11-20 22:49:24,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:24,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:24,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:24,375 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:24,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:49:24,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:24,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 22:49:24,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:24,656 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:24,657 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:49:24,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:24,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237218409] [2021-11-20 22:49:24,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 22:49:24,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288635438] [2021-11-20 22:49:24,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [288635438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:49:24,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:49:24,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:49:24,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170818784] [2021-11-20 22:49:24,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:49:24,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:49:24,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:24,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:49:24,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:49:24,707 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) [2021-11-20 22:49:24,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:24,748 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-20 22:49:24,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:49:24,751 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 [2021-11-20 22:49:24,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:24,758 INFO L225 Difference]: With dead ends: 16 [2021-11-20 22:49:24,758 INFO L226 Difference]: Without dead ends: 7 [2021-11-20 22:49:24,761 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 [2021-11-20 22:49:24,767 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 [2021-11-20 22:49:24,770 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] [2021-11-20 22:49:24,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2021-11-20 22:49:24,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2021-11-20 22:49:24,806 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) [2021-11-20 22:49:24,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2021-11-20 22:49:24,808 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2021-11-20 22:49:24,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:24,809 INFO L470 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2021-11-20 22:49:24,809 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) [2021-11-20 22:49:24,809 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2021-11-20 22:49:24,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 22:49:24,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:24,810 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 22:49:24,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:25,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-20 22:49:25,034 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:25,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:25,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1892089494, now seen corresponding path program 1 times [2021-11-20 22:49:25,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:25,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668058178] [2021-11-20 22:49:25,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:25,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:25,046 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 22:49:25,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1849530749] [2021-11-20 22:49:25,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:25,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:25,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:25,065 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:25,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:49:25,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:25,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 22:49:25,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:25,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:25,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:25,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:25,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:25,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668058178] [2021-11-20 22:49:25,367 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 22:49:25,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849530749] [2021-11-20 22:49:25,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849530749] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:25,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909053220] [2021-11-20 22:49:25,397 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-20 22:49:25,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:25,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:25,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:25,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:41,773 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:41,950 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:41,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 22:49:41,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-11-20 22:49:41,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146926526] [2021-11-20 22:49:41,951 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:41,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 22:49:41,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:41,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 22:49:41,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-20 22:49:41,953 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) [2021-11-20 22:49:42,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:42,034 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2021-11-20 22:49:42,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 22:49:42,035 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 [2021-11-20 22:49:42,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:42,035 INFO L225 Difference]: With dead ends: 11 [2021-11-20 22:49:42,035 INFO L226 Difference]: Without dead ends: 8 [2021-11-20 22:49:42,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-20 22:49:42,037 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:42,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 11 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:49:42,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-20 22:49:42,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-20 22:49:42,040 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) [2021-11-20 22:49:42,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2021-11-20 22:49:42,041 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2021-11-20 22:49:42,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:42,041 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2021-11-20 22:49:42,041 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) [2021-11-20 22:49:42,042 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2021-11-20 22:49:42,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 22:49:42,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:42,042 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-20 22:49:42,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-20 22:49:42,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:42,248 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:42,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:42,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1473865425, now seen corresponding path program 2 times [2021-11-20 22:49:42,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:42,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876472743] [2021-11-20 22:49:42,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:42,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:42,259 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 22:49:42,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [994371729] [2021-11-20 22:49:42,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:42,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:42,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:42,261 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:42,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:49:55,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 22:49:55,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:55,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 22:49:55,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:54,284 WARN L227 SmtUtils]: Spent 5.26s on a formula simplification. DAG size of input: 7 DAG size of output: 1 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-20 22:55:03,649 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 [2021-11-20 22:55:46,569 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 [2021-11-20 22:55:48,574 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 [2021-11-20 22:56:29,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-20 22:56:29,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:07,965 WARN L227 SmtUtils]: Spent 1.14m 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) [2021-11-20 22:58:29,588 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 [2021-11-20 22:58:29,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:29,588 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:58:29,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876472743] [2021-11-20 22:58:29,589 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 22:58:29,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994371729] [2021-11-20 22:58:29,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994371729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:29,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1458882957] [2021-11-20 22:58:29,592 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-20 22:58:29,593 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:58:29,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:58:29,594 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:58:29,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:58:49,675 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:59:00,466 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:59:00,467 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 22:59:00,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 10 [2021-11-20 22:59:00,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416124327] [2021-11-20 22:59:00,467 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 22:59:00,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 22:59:00,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:59:00,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 22:59:00,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=12, NotChecked=66, Total=210 [2021-11-20 22:59:00,470 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) [2021-11-20 23:00:08,909 WARN L227 SmtUtils]: Spent 52.78s 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) [2021-11-20 23:00:09,942 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:01:51,196 WARN L227 SmtUtils]: Spent 1.55m on a formula simplification. DAG size of input: 143 DAG size of output: 44 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:02:23,917 WARN L227 SmtUtils]: Spent 29.98s on a formula simplification. DAG size of input: 47 DAG size of output: 44 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:02:25,924 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 [2021-11-20 23:02:25,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:02:25,939 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2021-11-20 23:02:25,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:02:25,941 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 [2021-11-20 23:02:25,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:02:25,942 INFO L225 Difference]: With dead ends: 12 [2021-11-20 23:02:25,942 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 23:02:25,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 301.9s TimeCoverageRelationStatistics Valid=52, Invalid=152, Unknown=22, NotChecked=116, Total=342 [2021-11-20 23:02:25,946 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s 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, 2.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:02:25,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 20 Unchecked, 2.0s Time] [2021-11-20 23:02:25,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 23:02:25,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 23:02:25,949 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) [2021-11-20 23:02:25,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-20 23:02:25,950 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2021-11-20 23:02:25,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:02:25,951 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-20 23:02:25,951 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) [2021-11-20 23:02:25,951 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-20 23:02:25,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:02:25,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:02:25,952 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1] [2021-11-20 23:02:25,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:02:26,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:02:26,164 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:02:26,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:02:26,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1555714486, now seen corresponding path program 3 times [2021-11-20 23:02:26,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:02:26,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136690729] [2021-11-20 23:02:26,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:02:26,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:02:26,178 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:02:26,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [823554904] [2021-11-20 23:02:26,179 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:02:26,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:02:26,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:02:26,181 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:02:26,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c5fe0a0-682a-4533-ba0c-2b5bd40cc092/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:02:29,337 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:02:29,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:02:29,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:02:29,343 INFO L286 TraceCheckSpWp]: Computing forward predicates...