./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje --witnessprinter.witness.filename witness --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 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 07:11:47,316 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 07:11:47,406 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 07:11:47,415 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 07:11:47,415 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 07:11:47,453 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 07:11:47,454 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 07:11:47,456 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 07:11:47,457 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 07:11:47,458 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 07:11:47,458 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 07:11:47,460 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 07:11:47,461 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 07:11:47,461 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 07:11:47,462 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 07:11:47,462 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 07:11:47,466 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 07:11:47,466 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 07:11:47,467 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 07:11:47,467 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 07:11:47,467 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 07:11:47,468 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 07:11:47,472 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 07:11:47,473 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 07:11:47,473 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 07:11:47,473 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 07:11:47,474 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 07:11:47,474 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 07:11:47,474 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 07:11:47,475 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 07:11:47,475 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 07:11:47,475 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 07:11:47,476 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 07:11:47,476 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 07:11:47,477 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 07:11:47,477 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 07:11:47,477 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 07:11:47,478 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 07:11:47,478 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:11:47,479 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 07:11:47,479 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 07:11:47,481 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 07:11:47,481 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 07:11:47,482 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 07:11:47,482 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 07:11:47,483 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 07:11:47,483 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 07:11:47,484 INFO L153 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_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a [2024-11-09 07:11:47,818 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 07:11:47,857 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 07:11:47,861 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 07:11:47,863 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 07:11:47,864 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 07:11:47,866 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i Unable to find full path for "g++" [2024-11-09 07:11:50,330 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 07:11:50,618 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 07:11:50,619 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i [2024-11-09 07:11:50,629 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/data/894cb6389/bf16c59bf3e84314835b3e629bf2772c/FLAG557a23096 [2024-11-09 07:11:50,963 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/data/894cb6389/bf16c59bf3e84314835b3e629bf2772c [2024-11-09 07:11:50,967 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 07:11:50,969 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 07:11:50,971 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 07:11:50,971 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 07:11:50,981 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 07:11:50,982 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:11:50" (1/1) ... [2024-11-09 07:11:50,983 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65499cb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:50, skipping insertion in model container [2024-11-09 07:11:50,983 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:11:50" (1/1) ... [2024-11-09 07:11:51,027 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 07:11:51,262 WARN L250 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_66fbf8d7-2c66-401d-b961-c5355f703b57/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2024-11-09 07:11:51,299 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:11:51,310 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 07:11:51,328 WARN L250 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_66fbf8d7-2c66-401d-b961-c5355f703b57/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2024-11-09 07:11:51,345 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:11:51,369 INFO L204 MainTranslator]: Completed translation [2024-11-09 07:11:51,370 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51 WrapperNode [2024-11-09 07:11:51,370 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 07:11:51,371 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 07:11:51,372 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 07:11:51,372 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 07:11:51,382 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,392 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,417 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 109 [2024-11-09 07:11:51,418 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 07:11:51,419 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 07:11:51,419 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 07:11:51,419 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 07:11:51,433 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,434 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,437 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,438 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,446 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,453 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,454 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,456 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,459 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 07:11:51,461 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 07:11:51,461 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 07:11:51,461 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 07:11:51,462 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (1/1) ... [2024-11-09 07:11:51,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:11:51,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:51,503 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 07:11:51,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 07:11:51,543 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 07:11:51,544 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 07:11:51,544 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-09 07:11:51,546 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-09 07:11:51,547 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 07:11:51,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 07:11:51,547 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-09 07:11:51,547 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-09 07:11:51,547 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-09 07:11:51,548 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-09 07:11:51,649 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 07:11:51,651 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 07:11:51,947 INFO L? ?]: Removed 23 outVars from TransFormulas that were not future-live. [2024-11-09 07:11:51,947 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 07:11:52,007 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 07:11:52,008 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-09 07:11:52,009 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:11:52 BoogieIcfgContainer [2024-11-09 07:11:52,009 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 07:11:52,012 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 07:11:52,013 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 07:11:52,017 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 07:11:52,018 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 07:11:50" (1/3) ... [2024-11-09 07:11:52,019 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@93f67dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:11:52, skipping insertion in model container [2024-11-09 07:11:52,019 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:11:51" (2/3) ... [2024-11-09 07:11:52,019 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@93f67dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:11:52, skipping insertion in model container [2024-11-09 07:11:52,020 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:11:52" (3/3) ... [2024-11-09 07:11:52,022 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-1.i [2024-11-09 07:11:52,051 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 07:11:52,052 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 07:11:52,125 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 07:11:52,133 INFO L333 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, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3f396d52, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 07:11:52,134 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 07:11:52,139 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 32 states have (on average 1.5625) internal successors, (50), 33 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:52,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2024-11-09 07:11:52,148 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:52,149 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:52,150 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:52,156 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:52,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1571864468, now seen corresponding path program 1 times [2024-11-09 07:11:52,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:52,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862117112] [2024-11-09 07:11:52,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:52,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:52,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:52,565 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:11:52,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:52,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862117112] [2024-11-09 07:11:52,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862117112] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:11:52,568 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 07:11:52,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-09 07:11:52,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434544740] [2024-11-09 07:11:52,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:11:52,578 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-09 07:11:52,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:52,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-09 07:11:52,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-09 07:11:52,634 INFO L87 Difference]: Start difference. First operand has 38 states, 32 states have (on average 1.5625) internal successors, (50), 33 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:52,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:52,710 INFO L93 Difference]: Finished difference Result 75 states and 114 transitions. [2024-11-09 07:11:52,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-09 07:11:52,713 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2024-11-09 07:11:52,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:52,723 INFO L225 Difference]: With dead ends: 75 [2024-11-09 07:11:52,723 INFO L226 Difference]: Without dead ends: 38 [2024-11-09 07:11:52,728 INFO L431 NwaCegarLoop]: 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 [2024-11-09 07:11:52,735 INFO L432 NwaCegarLoop]: 49 mSDtfsCounter, 1 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:52,737 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 95 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-09 07:11:52,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-09 07:11:52,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2024-11-09 07:11:52,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:52,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 54 transitions. [2024-11-09 07:11:52,805 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 54 transitions. Word has length 13 [2024-11-09 07:11:52,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:52,806 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 54 transitions. [2024-11-09 07:11:52,806 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:52,806 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 54 transitions. [2024-11-09 07:11:52,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-09 07:11:52,807 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:52,808 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:52,808 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 07:11:52,808 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:52,809 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:52,809 INFO L85 PathProgramCache]: Analyzing trace with hash -145588199, now seen corresponding path program 1 times [2024-11-09 07:11:52,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:52,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104470869] [2024-11-09 07:11:52,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:52,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:52,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:53,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:11:53,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:53,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104470869] [2024-11-09 07:11:53,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104470869] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:53,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257069866] [2024-11-09 07:11:53,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:53,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:53,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:53,008 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:53,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 07:11:53,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:53,101 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-09 07:11:53,112 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:11:53,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:53,163 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 07:11:53,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257069866] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:11:53,164 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-09 07:11:53,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2024-11-09 07:11:53,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832372129] [2024-11-09 07:11:53,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:11:53,169 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-09 07:11:53,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:53,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-09 07:11:53,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-09 07:11:53,173 INFO L87 Difference]: Start difference. First operand 38 states and 54 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:53,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:53,303 INFO L93 Difference]: Finished difference Result 70 states and 100 transitions. [2024-11-09 07:11:53,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-09 07:11:53,306 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2024-11-09 07:11:53,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:53,307 INFO L225 Difference]: With dead ends: 70 [2024-11-09 07:11:53,310 INFO L226 Difference]: Without dead ends: 56 [2024-11-09 07:11:53,311 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-09 07:11:53,312 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 23 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:53,313 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 71 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:11:53,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-09 07:11:53,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2024-11-09 07:11:53,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:53,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 56 transitions. [2024-11-09 07:11:53,337 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 56 transitions. Word has length 15 [2024-11-09 07:11:53,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:53,337 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 56 transitions. [2024-11-09 07:11:53,338 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:53,338 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 56 transitions. [2024-11-09 07:11:53,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-11-09 07:11:53,340 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:53,340 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:53,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-09 07:11:53,541 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:53,542 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:53,542 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:53,543 INFO L85 PathProgramCache]: Analyzing trace with hash 73761868, now seen corresponding path program 1 times [2024-11-09 07:11:53,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:53,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290259000] [2024-11-09 07:11:53,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:53,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:53,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:53,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:11:53,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:53,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290259000] [2024-11-09 07:11:53,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290259000] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:53,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465612706] [2024-11-09 07:11:53,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:53,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:53,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:53,663 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:53,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 07:11:53,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:53,766 INFO L255 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjuncts are in the unsatisfiable core [2024-11-09 07:11:53,767 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:11:53,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:11:53,830 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:11:53,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:11:53,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465612706] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:11:53,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [972998163] [2024-11-09 07:11:53,907 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-09 07:11:53,907 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:11:53,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:11:53,921 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:11:53,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:11:54,563 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:11:54,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [972998163] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:11:54,693 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:11:54,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2024-11-09 07:11:54,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576389783] [2024-11-09 07:11:54,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:11:54,696 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 07:11:54,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:54,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 07:11:54,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2024-11-09 07:11:54,698 INFO L87 Difference]: Start difference. First operand 40 states and 56 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:54,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:54,964 INFO L93 Difference]: Finished difference Result 93 states and 135 transitions. [2024-11-09 07:11:54,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-09 07:11:54,965 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2024-11-09 07:11:54,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:54,966 INFO L225 Difference]: With dead ends: 93 [2024-11-09 07:11:54,966 INFO L226 Difference]: Without dead ends: 58 [2024-11-09 07:11:54,967 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2024-11-09 07:11:54,970 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 60 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:54,971 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 114 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:11:54,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-11-09 07:11:54,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2024-11-09 07:11:54,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 36 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:54,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 56 transitions. [2024-11-09 07:11:54,990 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 56 transitions. Word has length 17 [2024-11-09 07:11:54,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:54,990 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 56 transitions. [2024-11-09 07:11:54,990 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:54,990 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 56 transitions. [2024-11-09 07:11:54,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-09 07:11:54,991 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:54,991 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:55,020 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-09 07:11:55,195 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:55,195 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:55,196 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:55,196 INFO L85 PathProgramCache]: Analyzing trace with hash 187632713, now seen corresponding path program 1 times [2024-11-09 07:11:55,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:55,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539107031] [2024-11-09 07:11:55,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:55,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:55,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:55,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:55,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:55,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539107031] [2024-11-09 07:11:55,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539107031] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:55,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591814169] [2024-11-09 07:11:55,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:55,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:55,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:55,293 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:55,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 07:11:55,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:55,378 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjuncts are in the unsatisfiable core [2024-11-09 07:11:55,380 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:11:55,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:55,398 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:11:55,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:55,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591814169] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:11:55,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114819254] [2024-11-09 07:11:55,457 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-09 07:11:55,458 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:11:55,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:11:55,458 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:11:55,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:11:55,842 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2024-11-09 07:11:55,855 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:11:56,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '805#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (<= (+ (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| 4)) 1) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 07:11:56,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:11:56,221 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:11:56,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2024-11-09 07:11:56,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284038490] [2024-11-09 07:11:56,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:11:56,222 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 07:11:56,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:56,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 07:11:56,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2024-11-09 07:11:56,224 INFO L87 Difference]: Start difference. First operand 41 states and 56 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:56,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:56,321 INFO L93 Difference]: Finished difference Result 84 states and 116 transitions. [2024-11-09 07:11:56,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-09 07:11:56,323 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2024-11-09 07:11:56,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:56,324 INFO L225 Difference]: With dead ends: 84 [2024-11-09 07:11:56,324 INFO L226 Difference]: Without dead ends: 47 [2024-11-09 07:11:56,325 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2024-11-09 07:11:56,326 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 2 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:56,331 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 222 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:11:56,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-09 07:11:56,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-09 07:11:56,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.3333333333333333) internal successors, (56), 42 states have internal predecessors, (56), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:56,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2024-11-09 07:11:56,352 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 19 [2024-11-09 07:11:56,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:56,352 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2024-11-09 07:11:56,353 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:56,353 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2024-11-09 07:11:56,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-09 07:11:56,355 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:56,355 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:56,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-09 07:11:56,556 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:56,557 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:56,558 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:56,558 INFO L85 PathProgramCache]: Analyzing trace with hash -1194352936, now seen corresponding path program 2 times [2024-11-09 07:11:56,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:56,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751704103] [2024-11-09 07:11:56,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:56,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:56,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:56,825 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-09 07:11:56,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:56,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751704103] [2024-11-09 07:11:56,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751704103] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:11:56,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 07:11:56,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-09 07:11:56,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448789210] [2024-11-09 07:11:56,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:11:56,827 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-09 07:11:56,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:56,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-09 07:11:56,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 07:11:56,828 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:56,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:56,936 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2024-11-09 07:11:56,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-09 07:11:56,937 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2024-11-09 07:11:56,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:56,938 INFO L225 Difference]: With dead ends: 93 [2024-11-09 07:11:56,939 INFO L226 Difference]: Without dead ends: 61 [2024-11-09 07:11:56,939 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 07:11:56,940 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 13 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:56,941 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 77 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:11:56,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2024-11-09 07:11:56,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 54. [2024-11-09 07:11:56,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 states have internal predecessors, (65), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:56,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 71 transitions. [2024-11-09 07:11:56,954 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 71 transitions. Word has length 25 [2024-11-09 07:11:56,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:56,955 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 71 transitions. [2024-11-09 07:11:56,955 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:56,955 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 71 transitions. [2024-11-09 07:11:56,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-09 07:11:56,956 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:56,956 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:56,957 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-11-09 07:11:56,957 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:56,957 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:56,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1262970125, now seen corresponding path program 1 times [2024-11-09 07:11:56,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:56,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57424162] [2024-11-09 07:11:56,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:56,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:56,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:57,110 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:57,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:57,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57424162] [2024-11-09 07:11:57,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57424162] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:57,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525118628] [2024-11-09 07:11:57,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:57,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:57,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:57,114 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:57,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 07:11:57,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:57,212 INFO L255 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-11-09 07:11:57,214 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:11:57,251 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:57,251 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:11:57,359 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:57,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525118628] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:11:57,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3472872] [2024-11-09 07:11:57,364 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-09 07:11:57,366 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:11:57,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:11:57,367 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:11:57,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:11:57,733 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2024-11-09 07:11:57,751 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:11:58,122 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1368#(and (= |__VERIFIER_assert_#in~cond| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (<= |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_2| 0) (<= (+ (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2|) 1) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| (* |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_2| 4)))))))' at error location [2024-11-09 07:11:58,122 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:11:58,123 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:11:58,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2024-11-09 07:11:58,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544846141] [2024-11-09 07:11:58,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:11:58,124 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-09 07:11:58,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:58,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-09 07:11:58,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2024-11-09 07:11:58,126 INFO L87 Difference]: Start difference. First operand 54 states and 71 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:58,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:58,200 INFO L93 Difference]: Finished difference Result 110 states and 149 transitions. [2024-11-09 07:11:58,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-09 07:11:58,201 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2024-11-09 07:11:58,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:58,202 INFO L225 Difference]: With dead ends: 110 [2024-11-09 07:11:58,202 INFO L226 Difference]: Without dead ends: 66 [2024-11-09 07:11:58,203 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2024-11-09 07:11:58,204 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 2 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:58,204 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 90 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:11:58,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2024-11-09 07:11:58,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2024-11-09 07:11:58,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 61 states have internal predecessors, (77), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-09 07:11:58,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2024-11-09 07:11:58,217 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 25 [2024-11-09 07:11:58,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:58,217 INFO L471 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2024-11-09 07:11:58,217 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:58,218 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2024-11-09 07:11:58,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2024-11-09 07:11:58,218 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:58,219 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:58,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-09 07:11:58,419 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:58,420 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:58,421 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:58,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1220216239, now seen corresponding path program 2 times [2024-11-09 07:11:58,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:58,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964993936] [2024-11-09 07:11:58,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:58,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:58,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:11:58,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:58,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964993936] [2024-11-09 07:11:58,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964993936] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:58,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842703734] [2024-11-09 07:11:58,810 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:11:58,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:58,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:58,813 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:58,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 07:11:58,922 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2024-11-09 07:11:58,922 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:11:58,924 INFO L255 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 07:11:58,926 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:11:59,136 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-09 07:11:59,203 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2024-11-09 07:11:59,203 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 07:11:59,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842703734] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:11:59,204 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-09 07:11:59,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [12] total 18 [2024-11-09 07:11:59,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390294701] [2024-11-09 07:11:59,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:11:59,208 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-09 07:11:59,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:11:59,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-09 07:11:59,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2024-11-09 07:11:59,210 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:59,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:11:59,410 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2024-11-09 07:11:59,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-09 07:11:59,411 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2024-11-09 07:11:59,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:11:59,412 INFO L225 Difference]: With dead ends: 79 [2024-11-09 07:11:59,413 INFO L226 Difference]: Without dead ends: 77 [2024-11-09 07:11:59,413 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2024-11-09 07:11:59,414 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 56 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:11:59,415 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 167 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:11:59,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2024-11-09 07:11:59,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 71. [2024-11-09 07:11:59,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 64 states have (on average 1.25) internal successors, (80), 65 states have internal predecessors, (80), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-09 07:11:59,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2024-11-09 07:11:59,427 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 37 [2024-11-09 07:11:59,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:11:59,428 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2024-11-09 07:11:59,428 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:11:59,428 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2024-11-09 07:11:59,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2024-11-09 07:11:59,430 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:11:59,430 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:11:59,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-09 07:11:59,634 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:59,634 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:11:59,634 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:11:59,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1746664107, now seen corresponding path program 1 times [2024-11-09 07:11:59,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:11:59,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579019686] [2024-11-09 07:11:59,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:59,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:11:59,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:11:59,935 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 07:11:59,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:11:59,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579019686] [2024-11-09 07:11:59,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579019686] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:11:59,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794989746] [2024-11-09 07:11:59,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:11:59,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:11:59,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:11:59,937 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:11:59,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 07:12:00,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:00,054 INFO L255 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 07:12:00,056 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:00,124 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 07:12:00,124 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:00,474 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 07:12:00,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794989746] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:00,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [590085173] [2024-11-09 07:12:00,478 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:00,478 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:00,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:00,479 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:00,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:00,908 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:00,922 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:12:01,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2263#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:12:01,341 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:12:01,341 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:12:01,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2024-11-09 07:12:01,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329269734] [2024-11-09 07:12:01,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:12:01,344 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-09 07:12:01,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:12:01,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-09 07:12:01,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1140, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 07:12:01,347 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 25 states, 25 states have (on average 2.68) internal successors, (67), 25 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:01,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:12:01,483 INFO L93 Difference]: Finished difference Result 144 states and 189 transitions. [2024-11-09 07:12:01,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-09 07:12:01,484 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 25 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 45 [2024-11-09 07:12:01,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:12:01,486 INFO L225 Difference]: With dead ends: 144 [2024-11-09 07:12:01,486 INFO L226 Difference]: Without dead ends: 95 [2024-11-09 07:12:01,490 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=342, Invalid=1140, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 07:12:01,491 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 2 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:12:01,492 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 134 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:12:01,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-09 07:12:01,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2024-11-09 07:12:01,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 88 states have (on average 1.1818181818181819) internal successors, (104), 89 states have internal predecessors, (104), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-09 07:12:01,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2024-11-09 07:12:01,517 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 45 [2024-11-09 07:12:01,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:12:01,518 INFO L471 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2024-11-09 07:12:01,518 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 25 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:01,518 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2024-11-09 07:12:01,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-09 07:12:01,525 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:12:01,525 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:12:01,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-09 07:12:01,725 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-11-09 07:12:01,726 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:12:01,727 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:12:01,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1446801681, now seen corresponding path program 2 times [2024-11-09 07:12:01,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:12:01,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454720836] [2024-11-09 07:12:01,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:12:01,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:12:01,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:02,659 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 07:12:02,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:12:02,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454720836] [2024-11-09 07:12:02,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454720836] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:12:02,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250814915] [2024-11-09 07:12:02,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:12:02,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:02,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:12:02,662 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:12:02,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 07:12:02,761 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-09 07:12:02,762 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:12:02,764 INFO L255 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 07:12:02,766 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:02,838 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2024-11-09 07:12:02,839 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:02,924 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 487 trivial. 0 not checked. [2024-11-09 07:12:02,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250814915] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:02,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1783597289] [2024-11-09 07:12:02,928 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:02,928 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:02,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:02,929 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:02,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:03,270 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:03,278 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:12:03,773 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3061#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:12:03,773 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:12:03,773 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:12:03,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 5, 5] total 31 [2024-11-09 07:12:03,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807405596] [2024-11-09 07:12:03,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:12:03,774 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2024-11-09 07:12:03,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:12:03,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2024-11-09 07:12:03,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 07:12:03,777 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 31 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:04,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:12:04,270 INFO L93 Difference]: Finished difference Result 178 states and 235 transitions. [2024-11-09 07:12:04,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-09 07:12:04,271 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 31 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 69 [2024-11-09 07:12:04,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:12:04,272 INFO L225 Difference]: With dead ends: 178 [2024-11-09 07:12:04,273 INFO L226 Difference]: Without dead ends: 129 [2024-11-09 07:12:04,274 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=421, Invalid=2029, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 07:12:04,275 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 66 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:12:04,276 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 234 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:12:04,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2024-11-09 07:12:04,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 112. [2024-11-09 07:12:04,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 104 states have (on average 1.1538461538461537) internal successors, (120), 105 states have internal predecessors, (120), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:12:04,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2024-11-09 07:12:04,293 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 69 [2024-11-09 07:12:04,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:12:04,294 INFO L471 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2024-11-09 07:12:04,294 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 31 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:04,294 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2024-11-09 07:12:04,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2024-11-09 07:12:04,295 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:12:04,296 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:12:04,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-09 07:12:04,496 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:04,497 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:12:04,498 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:12:04,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1074646643, now seen corresponding path program 3 times [2024-11-09 07:12:04,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:12:04,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665580625] [2024-11-09 07:12:04,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:12:04,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:12:04,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:05,387 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-09 07:12:05,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:12:05,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665580625] [2024-11-09 07:12:05,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665580625] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:12:05,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602260629] [2024-11-09 07:12:05,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:12:05,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:05,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:12:05,389 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:12:05,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 07:12:05,565 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:12:05,565 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:12:05,567 INFO L255 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 25 conjuncts are in the unsatisfiable core [2024-11-09 07:12:05,573 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:05,693 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-09 07:12:05,694 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:06,763 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-09 07:12:06,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602260629] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:06,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014449811] [2024-11-09 07:12:06,767 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:06,767 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:06,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:06,768 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:06,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:07,207 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:07,214 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:12:07,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4013#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:12:07,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:12:07,709 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:12:07,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2024-11-09 07:12:07,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162297755] [2024-11-09 07:12:07,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:12:07,710 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-09 07:12:07,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:12:07,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-09 07:12:07,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2843, Unknown=0, NotChecked=0, Total=4160 [2024-11-09 07:12:07,715 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand has 51 states, 51 states have (on average 2.3333333333333335) internal successors, (119), 51 states have internal predecessors, (119), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:07,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:12:07,990 INFO L93 Difference]: Finished difference Result 226 states and 286 transitions. [2024-11-09 07:12:07,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2024-11-09 07:12:07,991 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.3333333333333335) internal successors, (119), 51 states have internal predecessors, (119), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 77 [2024-11-09 07:12:07,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:12:07,993 INFO L225 Difference]: With dead ends: 226 [2024-11-09 07:12:07,993 INFO L226 Difference]: Without dead ends: 162 [2024-11-09 07:12:07,995 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 190 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1317, Invalid=2843, Unknown=0, NotChecked=0, Total=4160 [2024-11-09 07:12:07,996 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:12:07,996 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 174 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:12:07,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2024-11-09 07:12:08,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2024-11-09 07:12:08,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 154 states have (on average 1.103896103896104) internal successors, (170), 155 states have internal predecessors, (170), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:12:08,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 180 transitions. [2024-11-09 07:12:08,018 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 180 transitions. Word has length 77 [2024-11-09 07:12:08,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:12:08,019 INFO L471 AbstractCegarLoop]: Abstraction has 162 states and 180 transitions. [2024-11-09 07:12:08,019 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.3333333333333335) internal successors, (119), 51 states have internal predecessors, (119), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:08,019 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 180 transitions. [2024-11-09 07:12:08,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2024-11-09 07:12:08,021 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:12:08,021 INFO L215 NwaCegarLoop]: trace histogram [48, 48, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:12:08,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-09 07:12:08,222 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-09 07:12:08,222 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:12:08,223 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:12:08,223 INFO L85 PathProgramCache]: Analyzing trace with hash -98119798, now seen corresponding path program 4 times [2024-11-09 07:12:08,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:12:08,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019423372] [2024-11-09 07:12:08,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:12:08,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:12:08,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:11,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2325 backedges. 2 proven. 2304 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-09 07:12:11,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:12:11,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019423372] [2024-11-09 07:12:11,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019423372] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:12:11,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920751135] [2024-11-09 07:12:11,654 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:12:11,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:11,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:12:11,656 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:12:11,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 07:12:11,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:11,903 INFO L255 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-09 07:12:11,908 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:12,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2325 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-09 07:12:12,106 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:16,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2325 backedges. 2 proven. 2304 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-09 07:12:16,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920751135] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:16,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [935390642] [2024-11-09 07:12:16,505 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:16,506 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:16,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:16,507 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:16,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:16,858 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:16,864 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:12:17,584 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5454#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:12:17,584 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:12:17,584 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:12:17,585 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 51] total 101 [2024-11-09 07:12:17,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820296770] [2024-11-09 07:12:17,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:12:17,586 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2024-11-09 07:12:17,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:12:17,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2024-11-09 07:12:17,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5092, Invalid=8018, Unknown=0, NotChecked=0, Total=13110 [2024-11-09 07:12:17,592 INFO L87 Difference]: Start difference. First operand 162 states and 180 transitions. Second operand has 101 states, 101 states have (on average 2.1683168316831685) internal successors, (219), 101 states have internal predecessors, (219), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:18,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:12:18,099 INFO L93 Difference]: Finished difference Result 326 states and 411 transitions. [2024-11-09 07:12:18,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2024-11-09 07:12:18,100 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.1683168316831685) internal successors, (219), 101 states have internal predecessors, (219), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 127 [2024-11-09 07:12:18,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:12:18,102 INFO L225 Difference]: With dead ends: 326 [2024-11-09 07:12:18,102 INFO L226 Difference]: Without dead ends: 262 [2024-11-09 07:12:18,107 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 315 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2603 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5092, Invalid=8018, Unknown=0, NotChecked=0, Total=13110 [2024-11-09 07:12:18,109 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:12:18,110 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 174 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:12:18,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2024-11-09 07:12:18,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2024-11-09 07:12:18,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 254 states have (on average 1.062992125984252) internal successors, (270), 255 states have internal predecessors, (270), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:12:18,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 280 transitions. [2024-11-09 07:12:18,136 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 280 transitions. Word has length 127 [2024-11-09 07:12:18,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:12:18,136 INFO L471 AbstractCegarLoop]: Abstraction has 262 states and 280 transitions. [2024-11-09 07:12:18,137 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.1683168316831685) internal successors, (219), 101 states have internal predecessors, (219), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:18,137 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 280 transitions. [2024-11-09 07:12:18,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2024-11-09 07:12:18,139 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:12:18,139 INFO L215 NwaCegarLoop]: trace histogram [98, 98, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:12:18,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-09 07:12:18,340 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-09 07:12:18,340 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:12:18,341 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:12:18,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1321357252, now seen corresponding path program 5 times [2024-11-09 07:12:18,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:12:18,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288416748] [2024-11-09 07:12:18,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:12:18,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:12:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:28,422 INFO L134 CoverageAnalysis]: Checked inductivity of 9625 backedges. 2 proven. 9604 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-09 07:12:28,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:12:28,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288416748] [2024-11-09 07:12:28,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288416748] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:12:28,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294466092] [2024-11-09 07:12:28,423 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:12:28,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:28,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:12:28,424 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:12:28,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 07:12:28,663 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-09 07:12:28,664 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:12:28,665 INFO L255 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-09 07:12:28,669 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:28,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9625 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 9609 trivial. 0 not checked. [2024-11-09 07:12:28,978 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:29,293 INFO L134 CoverageAnalysis]: Checked inductivity of 9625 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 9607 trivial. 0 not checked. [2024-11-09 07:12:29,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294466092] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:29,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444506849] [2024-11-09 07:12:29,296 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:29,296 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:29,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:29,297 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:29,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:29,561 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:29,566 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:12:30,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7807#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:12:30,621 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:12:30,621 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:12:30,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 8, 8] total 113 [2024-11-09 07:12:30,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737120120] [2024-11-09 07:12:30,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:12:30,622 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2024-11-09 07:12:30,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:12:30,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2024-11-09 07:12:30,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5173, Invalid=10577, Unknown=0, NotChecked=0, Total=15750 [2024-11-09 07:12:30,629 INFO L87 Difference]: Start difference. First operand 262 states and 280 transitions. Second operand has 113 states, 113 states have (on average 2.1769911504424777) internal successors, (246), 113 states have internal predecessors, (246), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:32,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:12:32,373 INFO L93 Difference]: Finished difference Result 363 states and 417 transitions. [2024-11-09 07:12:32,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2024-11-09 07:12:32,374 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.1769911504424777) internal successors, (246), 113 states have internal predecessors, (246), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 227 [2024-11-09 07:12:32,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:12:32,377 INFO L225 Difference]: With dead ends: 363 [2024-11-09 07:12:32,377 INFO L226 Difference]: Without dead ends: 299 [2024-11-09 07:12:32,384 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 654 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3140 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=5408, Invalid=14332, Unknown=0, NotChecked=0, Total=19740 [2024-11-09 07:12:32,385 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 65 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:12:32,387 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 332 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:12:32,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2024-11-09 07:12:32,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 282. [2024-11-09 07:12:32,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 274 states have (on average 1.0583941605839415) internal successors, (290), 275 states have internal predecessors, (290), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:12:32,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 300 transitions. [2024-11-09 07:12:32,416 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 300 transitions. Word has length 227 [2024-11-09 07:12:32,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:12:32,417 INFO L471 AbstractCegarLoop]: Abstraction has 282 states and 300 transitions. [2024-11-09 07:12:32,417 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.1769911504424777) internal successors, (246), 113 states have internal predecessors, (246), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:12:32,418 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 300 transitions. [2024-11-09 07:12:32,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2024-11-09 07:12:32,424 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:12:32,425 INFO L215 NwaCegarLoop]: trace histogram [99, 99, 10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:12:32,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-09 07:12:32,625 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:32,626 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:12:32,627 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:12:32,628 INFO L85 PathProgramCache]: Analyzing trace with hash 727167671, now seen corresponding path program 6 times [2024-11-09 07:12:32,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:12:32,628 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507667159] [2024-11-09 07:12:32,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:12:32,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:12:32,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:12:42,393 INFO L134 CoverageAnalysis]: Checked inductivity of 9906 backedges. 2 proven. 9801 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2024-11-09 07:12:42,393 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:12:42,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507667159] [2024-11-09 07:12:42,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507667159] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:12:42,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153017106] [2024-11-09 07:12:42,393 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:12:42,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:12:42,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:12:42,395 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:12:42,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 07:12:42,875 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:12:42,876 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:12:42,882 INFO L255 TraceCheckSpWp]: Trace formula consists of 1124 conjuncts, 101 conjuncts are in the unsatisfiable core [2024-11-09 07:12:42,888 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:12:43,312 INFO L134 CoverageAnalysis]: Checked inductivity of 9906 backedges. 0 proven. 9801 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-09 07:12:43,312 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:12:58,981 INFO L134 CoverageAnalysis]: Checked inductivity of 9906 backedges. 2 proven. 9801 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2024-11-09 07:12:58,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153017106] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:12:58,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [930398524] [2024-11-09 07:12:58,984 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:12:58,984 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:12:58,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:12:58,985 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:12:58,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:12:59,240 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:12:59,245 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:13:00,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10446#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:13:00,425 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:13:00,425 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:13:00,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 101, 102] total 203 [2024-11-09 07:13:00,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225661684] [2024-11-09 07:13:00,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:13:00,427 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2024-11-09 07:13:00,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:13:00,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2024-11-09 07:13:00,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20545, Invalid=26327, Unknown=0, NotChecked=0, Total=46872 [2024-11-09 07:13:00,446 INFO L87 Difference]: Start difference. First operand 282 states and 300 transitions. Second operand has 203 states, 203 states have (on average 2.083743842364532) internal successors, (423), 203 states have internal predecessors, (423), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:13:01,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:13:01,793 INFO L93 Difference]: Finished difference Result 566 states and 702 transitions. [2024-11-09 07:13:01,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2024-11-09 07:13:01,794 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 2.083743842364532) internal successors, (423), 203 states have internal predecessors, (423), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 241 [2024-11-09 07:13:01,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:13:01,796 INFO L225 Difference]: With dead ends: 566 [2024-11-09 07:13:01,796 INFO L226 Difference]: Without dead ends: 484 [2024-11-09 07:13:01,801 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 606 SyntacticMatches, 2 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5255 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=20545, Invalid=26327, Unknown=0, NotChecked=0, Total=46872 [2024-11-09 07:13:01,802 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:13:01,803 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 303 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:13:01,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2024-11-09 07:13:01,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 484. [2024-11-09 07:13:01,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 476 states have (on average 1.0336134453781514) internal successors, (492), 477 states have internal predecessors, (492), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:13:01,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 502 transitions. [2024-11-09 07:13:01,843 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 502 transitions. Word has length 241 [2024-11-09 07:13:01,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:13:01,844 INFO L471 AbstractCegarLoop]: Abstraction has 484 states and 502 transitions. [2024-11-09 07:13:01,844 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 2.083743842364532) internal successors, (423), 203 states have internal predecessors, (423), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:13:01,845 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 502 transitions. [2024-11-09 07:13:01,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2024-11-09 07:13:01,855 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:13:01,855 INFO L215 NwaCegarLoop]: trace histogram [200, 200, 10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:13:01,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-09 07:13:02,056 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:13:02,056 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:13:02,056 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:13:02,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1117534672, now seen corresponding path program 7 times [2024-11-09 07:13:02,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:13:02,057 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610283184] [2024-11-09 07:13:02,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:13:02,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:13:02,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:13:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 40105 backedges. 2 proven. 40000 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2024-11-09 07:13:37,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:13:37,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610283184] [2024-11-09 07:13:37,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610283184] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:13:37,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835230481] [2024-11-09 07:13:37,427 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:13:37,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:13:37,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:13:37,430 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:13:37,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 07:13:38,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:13:38,180 INFO L255 TraceCheckSpWp]: Trace formula consists of 2134 conjuncts, 202 conjuncts are in the unsatisfiable core [2024-11-09 07:13:38,188 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:13:38,911 INFO L134 CoverageAnalysis]: Checked inductivity of 40105 backedges. 0 proven. 40000 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-09 07:13:38,911 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:14:42,008 INFO L134 CoverageAnalysis]: Checked inductivity of 40105 backedges. 2 proven. 40000 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2024-11-09 07:14:42,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835230481] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:14:42,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829652087] [2024-11-09 07:14:42,010 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:14:42,011 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:14:42,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:14:42,011 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:14:42,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:14:42,308 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:14:42,314 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:14:44,477 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15080#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:14:44,477 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:14:44,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:14:44,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [203, 202, 203] total 405 [2024-11-09 07:14:44,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586350492] [2024-11-09 07:14:44,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:14:44,480 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2024-11-09 07:14:44,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:14:44,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2024-11-09 07:14:44,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81852, Invalid=93290, Unknown=0, NotChecked=0, Total=175142 [2024-11-09 07:14:44,518 INFO L87 Difference]: Start difference. First operand 484 states and 502 transitions. Second operand has 405 states, 405 states have (on average 2.0419753086419754) internal successors, (827), 405 states have internal predecessors, (827), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:14:50,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:14:50,930 INFO L93 Difference]: Finished difference Result 970 states and 1207 transitions. [2024-11-09 07:14:50,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2024-11-09 07:14:50,932 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 2.0419753086419754) internal successors, (827), 405 states have internal predecessors, (827), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 443 [2024-11-09 07:14:50,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:14:50,937 INFO L225 Difference]: With dead ends: 970 [2024-11-09 07:14:50,938 INFO L226 Difference]: Without dead ends: 888 [2024-11-09 07:14:50,950 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1530 GetRequests, 1111 SyntacticMatches, 2 SemanticMatches, 417 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10507 ImplicationChecksByTransitivity, 85.1s TimeCoverageRelationStatistics Valid=81852, Invalid=93290, Unknown=0, NotChecked=0, Total=175142 [2024-11-09 07:14:50,950 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:14:50,951 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 346 Invalid, 838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-11-09 07:14:50,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 888 states. [2024-11-09 07:14:51,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 888 to 888. [2024-11-09 07:14:51,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 888 states, 880 states have (on average 1.018181818181818) internal successors, (896), 881 states have internal predecessors, (896), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:14:51,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 906 transitions. [2024-11-09 07:14:51,019 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 906 transitions. Word has length 443 [2024-11-09 07:14:51,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:14:51,021 INFO L471 AbstractCegarLoop]: Abstraction has 888 states and 906 transitions. [2024-11-09 07:14:51,022 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 2.0419753086419754) internal successors, (827), 405 states have internal predecessors, (827), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:14:51,022 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 906 transitions. [2024-11-09 07:14:51,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 848 [2024-11-09 07:14:51,057 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:14:51,058 INFO L215 NwaCegarLoop]: trace histogram [402, 402, 10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:14:51,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2024-11-09 07:14:51,258 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-09 07:14:51,259 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:14:51,259 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:14:51,259 INFO L85 PathProgramCache]: Analyzing trace with hash -93803678, now seen corresponding path program 8 times [2024-11-09 07:14:51,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:14:51,260 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295103725] [2024-11-09 07:14:51,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:14:51,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:14:53,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:27,130 INFO L134 CoverageAnalysis]: Checked inductivity of 161709 backedges. 2 proven. 161604 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2024-11-09 07:17:27,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:27,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295103725] [2024-11-09 07:17:27,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295103725] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:27,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464621990] [2024-11-09 07:17:27,130 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:27,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:27,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:27,132 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:27,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 07:17:28,033 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-09 07:17:28,034 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:28,039 INFO L255 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-09 07:17:28,058 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:30,742 INFO L134 CoverageAnalysis]: Checked inductivity of 161709 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 161609 trivial. 0 not checked. [2024-11-09 07:17:30,742 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:33,655 INFO L134 CoverageAnalysis]: Checked inductivity of 161709 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 161607 trivial. 0 not checked. [2024-11-09 07:17:33,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464621990] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634679592] [2024-11-09 07:17:33,657 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:17:33,658 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:33,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:33,658 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:33,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:33,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:17:33,924 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:37,996 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23374#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:17:37,996 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:37,996 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:37,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 14, 14] total 429 [2024-11-09 07:17:37,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262002441] [2024-11-09 07:17:37,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:38,000 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 429 states [2024-11-09 07:17:38,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:38,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 429 interpolants. [2024-11-09 07:17:38,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82155, Invalid=112767, Unknown=0, NotChecked=0, Total=194922 [2024-11-09 07:17:38,036 INFO L87 Difference]: Start difference. First operand 888 states and 906 transitions. Second operand has 429 states, 429 states have (on average 2.046620046620047) internal successors, (878), 429 states have internal predecessors, (878), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:17:54,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:54,445 INFO L93 Difference]: Finished difference Result 1025 states and 1088 transitions. [2024-11-09 07:17:54,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 441 states. [2024-11-09 07:17:54,447 INFO L78 Accepts]: Start accepts. Automaton has has 429 states, 429 states have (on average 2.046620046620047) internal successors, (878), 429 states have internal predecessors, (878), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 847 [2024-11-09 07:17:54,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:54,454 INFO L225 Difference]: With dead ends: 1025 [2024-11-09 07:17:54,454 INFO L226 Difference]: Without dead ends: 943 [2024-11-09 07:17:54,474 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2977 GetRequests, 2502 SyntacticMatches, 2 SemanticMatches, 473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17069 ImplicationChecksByTransitivity, 101.8s TimeCoverageRelationStatistics Valid=83101, Invalid=142049, Unknown=0, NotChecked=0, Total=225150 [2024-11-09 07:17:54,475 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 156 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 1095 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1095 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:54,476 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 404 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1095 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-11-09 07:17:54,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 943 states. [2024-11-09 07:17:54,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 943 to 926. [2024-11-09 07:17:54,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 926 states, 918 states have (on average 1.0174291938997821) internal successors, (934), 919 states have internal predecessors, (934), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-09 07:17:54,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 944 transitions. [2024-11-09 07:17:54,542 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 944 transitions. Word has length 847 [2024-11-09 07:17:54,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:54,544 INFO L471 AbstractCegarLoop]: Abstraction has 926 states and 944 transitions. [2024-11-09 07:17:54,545 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 429 states, 429 states have (on average 2.046620046620047) internal successors, (878), 429 states have internal predecessors, (878), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-09 07:17:54,546 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 944 transitions. [2024-11-09 07:17:54,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 874 [2024-11-09 07:17:54,556 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:54,557 INFO L215 NwaCegarLoop]: trace histogram [403, 403, 22, 22, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:17:54,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-09 07:17:54,761 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-09 07:17:54,761 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:54,762 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:54,762 INFO L85 PathProgramCache]: Analyzing trace with hash 974389251, now seen corresponding path program 9 times [2024-11-09 07:17:54,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:54,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129286026] [2024-11-09 07:17:54,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:54,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:56,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:33,213 INFO L134 CoverageAnalysis]: Checked inductivity of 162898 backedges. 2 proven. 162409 refuted. 0 times theorem prover too weak. 487 trivial. 0 not checked. [2024-11-09 07:20:33,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:33,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129286026] [2024-11-09 07:20:33,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129286026] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:33,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894692656] [2024-11-09 07:20:33,214 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:20:33,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:33,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:33,216 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:33,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66fbf8d7-2c66-401d-b961-c5355f703b57/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 07:20:34,520 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:20:34,520 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:34,563 INFO L255 TraceCheckSpWp]: Trace formula consists of 4224 conjuncts, 405 conjuncts are in the unsatisfiable core [2024-11-09 07:20:34,589 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:36,218 INFO L134 CoverageAnalysis]: Checked inductivity of 162898 backedges. 0 proven. 162409 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2024-11-09 07:20:36,218 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:27,714 INFO L134 CoverageAnalysis]: Checked inductivity of 162898 backedges. 2 proven. 162409 refuted. 0 times theorem prover too weak. 487 trivial. 0 not checked. [2024-11-09 07:24:27,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894692656] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:27,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512413916] [2024-11-09 07:24:27,717 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2024-11-09 07:24:27,717 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:27,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:27,718 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:27,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:27,950 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2024-11-09 07:24:27,955 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:31,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32408#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-09 07:24:31,675 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:31,675 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:31,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [406, 405, 406] total 811 [2024-11-09 07:24:31,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788463035] [2024-11-09 07:24:31,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:31,679 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2024-11-09 07:24:31,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:31,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2024-11-09 07:24:31,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328497, Invalid=351303, Unknown=0, NotChecked=0, Total=679800 [2024-11-09 07:24:31,816 INFO L87 Difference]: Start difference. First operand 926 states and 944 transitions. Second operand has 811 states, 811 states have (on average 2.020961775585697) internal successors, (1639), 811 states have internal predecessors, (1639), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)