./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.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_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/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_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/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_177b5676-5ee3-4029-89e8-8d8a91cdc424/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 bec73cbd355af8995620266d1bb50e13212a1740ed8bd583620b6985b8fd569c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:14:04,154 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:14:04,158 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:14:04,220 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:14:04,221 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:14:04,226 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:14:04,228 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:14:04,233 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:14:04,236 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:14:04,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:14:04,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:14:04,246 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:14:04,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:14:04,250 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:14:04,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:14:04,262 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:14:04,264 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:14:04,265 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:14:04,268 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:14:04,277 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:14:04,280 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:14:04,281 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:14:04,285 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:14:04,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:14:04,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:14:04,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:14:04,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:14:04,302 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:14:04,302 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:14:04,304 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:14:04,305 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:14:04,306 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:14:04,309 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:14:04,310 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:14:04,312 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:14:04,312 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:14:04,313 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:14:04,314 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:14:04,314 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:14:04,315 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:14:04,316 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:14:04,317 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:14:04,368 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:14:04,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:14:04,369 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:14:04,370 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:14:04,371 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:14:04,371 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:14:04,371 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:14:04,372 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:14:04,372 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:14:04,372 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:14:04,373 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:14:04,374 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:14:04,374 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:14:04,374 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:14:04,375 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:14:04,375 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:14:04,375 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:14:04,376 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:14:04,377 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:14:04,377 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:14:04,377 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:14:04,377 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:14:04,378 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:14:04,378 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:14:04,378 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:14:04,379 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:14:04,380 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:14:04,381 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:14:04,381 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:14:04,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:14:04,381 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:14:04,382 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:14:04,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:14:04,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:14:04,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:14:04,383 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:14:04,383 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:14:04,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:14:04,384 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:14:04,384 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:14:04,385 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:14:04,385 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_177b5676-5ee3-4029-89e8-8d8a91cdc424/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bec73cbd355af8995620266d1bb50e13212a1740ed8bd583620b6985b8fd569c [2021-11-20 23:14:04,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:14:04,735 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:14:04,739 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:14:04,740 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:14:04,741 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:14:04,742 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c [2021-11-20 23:14:04,810 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/data/5ad098036/33321a232cf5441e8e8829a971d77962/FLAG539b537e3 [2021-11-20 23:14:05,245 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:14:05,246 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c [2021-11-20 23:14:05,252 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/data/5ad098036/33321a232cf5441e8e8829a971d77962/FLAG539b537e3 [2021-11-20 23:14:05,658 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/data/5ad098036/33321a232cf5441e8e8829a971d77962 [2021-11-20 23:14:05,661 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:14:05,662 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:14:05,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:14:05,664 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:14:05,668 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:14:05,668 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,670 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23e14aac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05, skipping insertion in model container [2021-11-20 23:14:05,670 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,677 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:14:05,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:14:05,837 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_177b5676-5ee3-4029-89e8-8d8a91cdc424/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c[387,400] [2021-11-20 23:14:05,853 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:14:05,859 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:14:05,868 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_177b5676-5ee3-4029-89e8-8d8a91cdc424/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c[387,400] [2021-11-20 23:14:05,874 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:14:05,887 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:14:05,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05 WrapperNode [2021-11-20 23:14:05,888 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:14:05,889 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:14:05,889 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:14:05,889 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:14:05,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,903 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,922 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-20 23:14:05,922 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:14:05,923 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:14:05,923 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:14:05,924 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:14:05,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,933 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,934 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,942 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,945 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:14:05,946 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:14:05,947 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:14:05,947 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:14:05,948 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (1/1) ... [2021-11-20 23:14:05,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:14:05,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:05,981 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:14:05,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:14:06,023 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:14:06,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:14:06,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:14:06,082 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:14:06,083 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:14:06,182 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:14:06,211 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:14:06,212 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:14:06,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:14:06 BoogieIcfgContainer [2021-11-20 23:14:06,221 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:14:06,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:14:06,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:14:06,226 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:14:06,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:14:05" (1/3) ... [2021-11-20 23:14:06,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ab5742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:14:06, skipping insertion in model container [2021-11-20 23:14:06,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:05" (2/3) ... [2021-11-20 23:14:06,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ab5742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:14:06, skipping insertion in model container [2021-11-20 23:14:06,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:14:06" (3/3) ... [2021-11-20 23:14:06,229 INFO L111 eAbstractionObserver]: Analyzing ICFG verisec_sendmail_tTflag_arr_one_loop.c [2021-11-20 23:14:06,234 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:14:06,234 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:14:06,276 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:14:06,283 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 23:14:06,283 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:14:06,296 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:06,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:14:06,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:06,301 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:14:06,301 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:06,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:06,307 INFO L85 PathProgramCache]: Analyzing trace with hash 71697392, now seen corresponding path program 1 times [2021-11-20 23:14:06,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:06,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629445423] [2021-11-20 23:14:06,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:06,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:06,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:06,475 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 23:14:06,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:06,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629445423] [2021-11-20 23:14:06,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629445423] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:06,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:06,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:14:06,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779945731] [2021-11-20 23:14:06,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:06,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:06,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:06,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:06,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:06,571 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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 23:14:06,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:06,608 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2021-11-20 23:14:06,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:06,611 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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 23:14:06,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:06,618 INFO L225 Difference]: With dead ends: 21 [2021-11-20 23:14:06,619 INFO L226 Difference]: Without dead ends: 11 [2021-11-20 23:14:06,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:14:06,625 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:06,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:06,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-20 23:14:06,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 7. [2021-11-20 23:14:06,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 23:14:06,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2021-11-20 23:14:06,657 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2021-11-20 23:14:06,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:06,657 INFO L470 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2021-11-20 23:14:06,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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 23:14:06,658 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2021-11-20 23:14:06,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:14:06,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:06,658 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:14:06,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:14:06,659 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:06,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:06,660 INFO L85 PathProgramCache]: Analyzing trace with hash -2077007100, now seen corresponding path program 1 times [2021-11-20 23:14:06,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:06,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902198774] [2021-11-20 23:14:06,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:06,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:06,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:06,761 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 23:14:06,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:06,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902198774] [2021-11-20 23:14:06,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902198774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:06,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991263212] [2021-11-20 23:14:06,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:06,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:06,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:06,769 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:06,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:14:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:06,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:14:06,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:06,902 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 23:14:06,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:06,938 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 23:14:06,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991263212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:06,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1882144886] [2021-11-20 23:14:06,965 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-20 23:14:06,966 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:06,972 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:06,980 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:06,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:07,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,160 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:14:07,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:14:07,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-20 23:14:07,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2021-11-20 23:14:07,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,573 INFO L354 Elim1Store]: treesize reduction 90, result has 14.3 percent of original size [2021-11-20 23:14:07,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 214 treesize of output 204 [2021-11-20 23:14:07,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:14:07,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:14:08,091 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:08,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1882144886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:08,205 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:08,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2021-11-20 23:14:08,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292212271] [2021-11-20 23:14:08,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:08,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:14:08,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:08,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:14:08,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:14:08,212 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 5 states, 5 states have (on average 1.2) 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) [2021-11-20 23:14:08,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:08,261 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-20 23:14:08,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:14:08,261 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) 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 [2021-11-20 23:14:08,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:08,262 INFO L225 Difference]: With dead ends: 15 [2021-11-20 23:14:08,262 INFO L226 Difference]: Without dead ends: 12 [2021-11-20 23:14:08,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:14:08,264 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 5 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:08,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:08,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-20 23:14:08,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 8. [2021-11-20 23:14:08,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 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 23:14:08,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-20 23:14:08,269 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-11-20 23:14:08,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:08,270 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-20 23:14:08,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) 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) [2021-11-20 23:14:08,270 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-20 23:14:08,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:14:08,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:08,271 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:08,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:08,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:14:08,495 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:08,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:08,495 INFO L85 PathProgramCache]: Analyzing trace with hash 36533005, now seen corresponding path program 1 times [2021-11-20 23:14:08,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:08,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140583725] [2021-11-20 23:14:08,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:08,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:08,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:08,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:14:08,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:08,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140583725] [2021-11-20 23:14:08,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140583725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:08,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459389280] [2021-11-20 23:14:08,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:08,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:08,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:08,544 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:08,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:14:08,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:08,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:14:08,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:08,626 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:14:08,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:08,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:14:08,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459389280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:08,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022830355] [2021-11-20 23:14:08,670 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-20 23:14:08,671 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:08,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:08,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:08,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:08,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:08,740 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-20 23:14:08,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-20 23:14:08,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:08,804 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:14:08,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:14:08,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:08,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:14:09,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:09,062 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-20 23:14:09,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 208 treesize of output 205 [2021-11-20 23:14:09,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:14:09,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:14:10,356 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:10,516 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:10,517 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:10,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:14:10,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437819103] [2021-11-20 23:14:10,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:10,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:14:10,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:10,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:14:10,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:14:10,519 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 23:14:10,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:10,547 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-11-20 23:14:10,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:14:10,548 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 23:14:10,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:10,549 INFO L225 Difference]: With dead ends: 20 [2021-11-20 23:14:10,549 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 23:14:10,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:14:10,551 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:10,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:10,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 23:14:10,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 11. [2021-11-20 23:14:10,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 23:14:10,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-20 23:14:10,556 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2021-11-20 23:14:10,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:10,557 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-20 23:14:10,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 23:14:10,557 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-20 23:14:10,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:14:10,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:10,558 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:10,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:10,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:10,775 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:10,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:10,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1101687457, now seen corresponding path program 2 times [2021-11-20 23:14:10,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:10,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942936636] [2021-11-20 23:14:10,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:10,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:10,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:10,881 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:14:10,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:10,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942936636] [2021-11-20 23:14:10,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942936636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:10,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623407790] [2021-11-20 23:14:10,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:14:10,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:10,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:10,887 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:10,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_177b5676-5ee3-4029-89e8-8d8a91cdc424/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:14:10,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:14:10,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:10,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:14:10,940 INFO L286 TraceCheckSpWp]: Computing forward predicates...