./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_2+newton_3_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_2+newton_3_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1a2810bb21e6de0cf080b546d334e2bc4a7723a0569c58531da7e4847e328a8e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:40:33,886 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:40:33,889 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:40:33,926 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:40:33,927 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:40:33,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:40:33,935 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:40:33,939 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:40:33,942 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:40:33,950 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:40:33,951 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:40:33,953 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:40:33,954 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:40:33,957 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:40:33,959 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:40:33,961 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:40:33,963 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:40:33,964 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:40:33,970 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:40:33,977 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:40:33,979 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:40:33,981 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:40:33,984 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:40:33,985 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:40:33,996 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:40:33,997 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:40:33,997 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:40:33,999 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:40:34,000 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:40:34,002 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:40:34,002 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:40:34,003 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:40:34,006 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:40:34,007 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:40:34,009 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:40:34,009 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:40:34,010 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:40:34,010 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:40:34,011 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:40:34,012 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:40:34,013 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:40:34,014 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:40:34,066 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:40:34,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:40:34,069 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:40:34,069 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:40:34,076 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:40:34,076 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:40:34,077 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:40:34,077 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:40:34,077 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:40:34,078 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:40:34,079 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:40:34,079 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:40:34,079 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:40:34,080 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:40:34,080 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:40:34,080 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:40:34,081 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:40:34,081 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:40:34,082 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:40:34,082 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:40:34,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:40:34,083 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:40:34,084 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:40:34,084 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:40:34,084 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:40:34,085 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:40:34,087 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:40:34,087 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:40:34,087 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:40:34,088 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:40:34,088 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:40:34,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:40:34,089 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:40:34,089 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:40:34,089 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:40:34,090 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:40:34,091 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:40:34,091 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:40:34,091 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:40:34,092 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:40:34,092 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:40:34,092 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_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a2810bb21e6de0cf080b546d334e2bc4a7723a0569c58531da7e4847e328a8e [2021-11-23 03:40:34,456 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:40:34,485 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:40:34,488 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:40:34,490 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:40:34,491 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:40:34,492 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_2+newton_3_2.i [2021-11-23 03:40:34,587 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/data/64abeed89/5871be8dbf374a71b3fe3e9681611161/FLAGecfe8aa12 [2021-11-23 03:40:35,061 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:40:35,062 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/sv-benchmarks/c/combinations/gcd_2+newton_3_2.i [2021-11-23 03:40:35,070 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/data/64abeed89/5871be8dbf374a71b3fe3e9681611161/FLAGecfe8aa12 [2021-11-23 03:40:35,537 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/data/64abeed89/5871be8dbf374a71b3fe3e9681611161 [2021-11-23 03:40:35,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:40:35,541 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:40:35,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:40:35,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:40:35,550 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:40:35,551 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:35,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fcfdd2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35, skipping insertion in model container [2021-11-23 03:40:35,555 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:35,563 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:40:35,591 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:40:35,784 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_f595187b-4136-4ded-a68f-2441b9492b18/sv-benchmarks/c/combinations/gcd_2+newton_3_2.i[1226,1239] [2021-11-23 03:40:35,842 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_f595187b-4136-4ded-a68f-2441b9492b18/sv-benchmarks/c/combinations/gcd_2+newton_3_2.i[2862,2875] [2021-11-23 03:40:35,855 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:40:35,865 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:40:35,887 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_f595187b-4136-4ded-a68f-2441b9492b18/sv-benchmarks/c/combinations/gcd_2+newton_3_2.i[1226,1239] [2021-11-23 03:40:35,912 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_f595187b-4136-4ded-a68f-2441b9492b18/sv-benchmarks/c/combinations/gcd_2+newton_3_2.i[2862,2875] [2021-11-23 03:40:35,913 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:40:35,930 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:40:35,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35 WrapperNode [2021-11-23 03:40:35,931 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:40:35,933 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:40:35,933 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:40:35,933 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:40:35,941 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:35,960 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:35,996 INFO L137 Inliner]: procedures = 27, calls = 18, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 82 [2021-11-23 03:40:35,997 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:40:35,998 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:40:35,999 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:40:35,999 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:40:36,009 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,014 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,014 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,033 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,041 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,043 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:40:36,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:40:36,055 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:40:36,055 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:40:36,056 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (1/1) ... [2021-11-23 03:40:36,069 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:40:36,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:40:36,097 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:40:36,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:40:36,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:40:36,143 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 03:40:36,144 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 03:40:36,144 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 03:40:36,144 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 03:40:36,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:40:36,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:40:36,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:40:36,206 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:40:36,207 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:40:36,437 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:40:36,500 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:40:36,500 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:40:36,502 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:40:36 BoogieIcfgContainer [2021-11-23 03:40:36,503 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:40:36,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:40:36,505 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:40:36,517 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:40:36,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:40:35" (1/3) ... [2021-11-23 03:40:36,518 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@142f3a1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:40:36, skipping insertion in model container [2021-11-23 03:40:36,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:35" (2/3) ... [2021-11-23 03:40:36,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@142f3a1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:40:36, skipping insertion in model container [2021-11-23 03:40:36,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:40:36" (3/3) ... [2021-11-23 03:40:36,521 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_2+newton_3_2.i [2021-11-23 03:40:36,528 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:40:36,528 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:40:36,577 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:40:36,584 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:40:36,584 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:40:36,600 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 17 states have (on average 1.411764705882353) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:40:36,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:40:36,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:40:36,606 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:40:36,607 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:40:36,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:40:36,621 INFO L85 PathProgramCache]: Analyzing trace with hash -291944571, now seen corresponding path program 1 times [2021-11-23 03:40:36,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:40:36,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691746910] [2021-11-23 03:40:36,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:36,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:40:36,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:40:36,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:40:36,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:40:36,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691746910] [2021-11-23 03:40:36,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691746910] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:40:36,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:40:36,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:40:36,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038354856] [2021-11-23 03:40:36,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:40:36,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:40:36,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:40:36,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:40:36,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:40:36,984 INFO L87 Difference]: Start difference. First operand has 28 states, 17 states have (on average 1.411764705882353) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:40:37,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:40:37,053 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-23 03:40:37,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:40:37,056 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-23 03:40:37,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:40:37,063 INFO L225 Difference]: With dead ends: 41 [2021-11-23 03:40:37,063 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 03:40:37,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:40:37,070 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 4 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:40:37,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 67 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:40:37,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 03:40:37,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 03:40:37,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:40:37,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-23 03:40:37,111 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 6 [2021-11-23 03:40:37,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:40:37,111 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-23 03:40:37,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:40:37,112 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-23 03:40:37,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:40:37,113 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:40:37,113 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:40:37,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:40:37,114 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:40:37,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:40:37,115 INFO L85 PathProgramCache]: Analyzing trace with hash -533010262, now seen corresponding path program 1 times [2021-11-23 03:40:37,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:40:37,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342016945] [2021-11-23 03:40:37,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:37,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:40:37,130 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:40:37,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338852469] [2021-11-23 03:40:37,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:37,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:40:37,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:40:37,133 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:40:37,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:40:37,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:40:37,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:40:37,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:40:37,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:40:37,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:40:37,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:40:37,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:40:37,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342016945] [2021-11-23 03:40:37,905 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:40:37,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338852469] [2021-11-23 03:40:37,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338852469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:40:37,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470641333] [2021-11-23 03:40:37,938 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 03:40:37,938 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:40:37,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:40:37,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:40:37,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:40:38,537 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:40:38,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '172#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~b#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (ite (<= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:40:38,866 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:40:38,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:40:38,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-23 03:40:38,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464414733] [2021-11-23 03:40:38,868 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:40:38,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:40:38,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:40:38,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:40:38,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:40:38,870 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:40:39,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:40:39,145 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2021-11-23 03:40:39,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:40:39,146 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 03:40:39,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:40:39,147 INFO L225 Difference]: With dead ends: 31 [2021-11-23 03:40:39,147 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 03:40:39,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:40:39,150 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:40:39,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 149 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:40:39,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 03:40:39,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 03:40:39,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:40:39,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-23 03:40:39,157 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 7 [2021-11-23 03:40:39,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:40:39,158 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-23 03:40:39,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:40:39,158 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-23 03:40:39,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:40:39,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:40:39,159 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-11-23 03:40:39,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:40:39,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:40:39,376 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:40:39,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:40:39,376 INFO L85 PathProgramCache]: Analyzing trace with hash 847992842, now seen corresponding path program 2 times [2021-11-23 03:40:39,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:40:39,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995292070] [2021-11-23 03:40:39,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:39,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:40:39,387 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:40:39,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [937569643] [2021-11-23 03:40:39,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:40:39,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:40:39,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:40:39,388 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:40:39,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f595187b-4136-4ded-a68f-2441b9492b18/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:40:39,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:40:39,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:40:39,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 03:40:39,543 INFO L286 TraceCheckSpWp]: Computing forward predicates...