./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91 --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 c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:14:33,352 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:14:33,429 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:14:33,435 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:14:33,436 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:14:33,465 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:14:33,466 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:14:33,467 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:14:33,468 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:14:33,468 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:14:33,469 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:14:33,469 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:14:33,470 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:14:33,470 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:14:33,471 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:14:33,471 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:14:33,472 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:14:33,472 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:14:33,473 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:14:33,474 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:14:33,474 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:14:33,475 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:14:33,475 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:14:33,476 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:14:33,476 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:14:33,477 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:14:33,477 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:14:33,478 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:14:33,478 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:14:33,479 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:14:33,479 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:14:33,479 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:14:33,480 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:14:33,480 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:14:33,481 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:14:33,481 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:14:33,481 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:14:33,482 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:14:33,482 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:14:33,483 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:14:33,483 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:14:33,487 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:14:33,487 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:14:33,487 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:14:33,488 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:14:33,488 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:14:33,488 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:14:33,488 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_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 [2023-11-24 23:14:33,778 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:14:33,810 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:14:33,813 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:14:33,815 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:14:33,816 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:14:33,817 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2023-11-24 23:14:36,982 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:14:37,200 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:14:37,201 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2023-11-24 23:14:37,211 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/data/4291472bc/e801cc193ea64e8db534fa77944e0e1b/FLAG63192caf7 [2023-11-24 23:14:37,225 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/data/4291472bc/e801cc193ea64e8db534fa77944e0e1b [2023-11-24 23:14:37,228 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:14:37,230 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:14:37,231 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:14:37,231 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:14:37,237 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:14:37,237 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,239 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f0c2db5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37, skipping insertion in model container [2023-11-24 23:14:37,239 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,271 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:14:37,422 WARN L240 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_72463d89-b31d-46fc-827c-efbbe3b73c13/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2023-11-24 23:14:37,481 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:14:37,502 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:14:37,514 WARN L240 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_72463d89-b31d-46fc-827c-efbbe3b73c13/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2023-11-24 23:14:37,553 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:14:37,569 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:14:37,569 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37 WrapperNode [2023-11-24 23:14:37,570 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:14:37,571 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:14:37,571 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:14:37,571 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:14:37,579 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,590 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,629 INFO L138 Inliner]: procedures = 17, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 187 [2023-11-24 23:14:37,635 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:14:37,636 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:14:37,636 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:14:37,636 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:14:37,646 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,647 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,661 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,674 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,681 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,686 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,690 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,696 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,700 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:14:37,701 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:14:37,701 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:14:37,701 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:14:37,711 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (1/1) ... [2023-11-24 23:14:37,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:14:37,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:14:37,747 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:14:37,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:14:37,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:14:37,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:14:37,789 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2023-11-24 23:14:37,789 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2023-11-24 23:14:37,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:14:37,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:14:37,792 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-24 23:14:37,793 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-24 23:14:37,926 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:14:37,931 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:14:38,519 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:14:38,761 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:14:38,761 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-24 23:14:38,763 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:14:38 BoogieIcfgContainer [2023-11-24 23:14:38,763 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:14:38,767 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:14:38,767 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:14:38,771 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:14:38,772 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:14:37" (1/3) ... [2023-11-24 23:14:38,772 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@561235f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:14:38, skipping insertion in model container [2023-11-24 23:14:38,773 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:14:37" (2/3) ... [2023-11-24 23:14:38,773 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@561235f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:14:38, skipping insertion in model container [2023-11-24 23:14:38,773 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:14:38" (3/3) ... [2023-11-24 23:14:38,775 INFO L112 eAbstractionObserver]: Analyzing ICFG soft_float_1-2a.c.cil.c [2023-11-24 23:14:38,796 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:14:38,797 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:14:38,856 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:14:38,864 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=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;@316f8a01, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:14:38,864 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:14:38,869 INFO L276 IsEmpty]: Start isEmpty. Operand has 45 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 36 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-24 23:14:38,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 23:14:38,876 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:14:38,877 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:14:38,877 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:14:38,882 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:14:38,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1306313511, now seen corresponding path program 1 times [2023-11-24 23:14:38,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:14:38,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102964929] [2023-11-24 23:14:38,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:38,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:14:39,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:39,907 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:39,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:14:39,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102964929] [2023-11-24 23:14:39,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102964929] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:14:39,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:14:39,910 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-24 23:14:39,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225405457] [2023-11-24 23:14:39,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:14:39,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:14:39,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:14:39,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:14:39,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-24 23:14:39,971 INFO L87 Difference]: Start difference. First operand has 45 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 36 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:14:40,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:14:40,255 INFO L93 Difference]: Finished difference Result 115 states and 190 transitions. [2023-11-24 23:14:40,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:14:40,258 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-24 23:14:40,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:14:40,268 INFO L225 Difference]: With dead ends: 115 [2023-11-24 23:14:40,269 INFO L226 Difference]: Without dead ends: 69 [2023-11-24 23:14:40,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:14:40,276 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 27 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:14:40,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 308 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:14:40,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-24 23:14:40,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 49. [2023-11-24 23:14:40,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 38 states have internal predecessors, (50), 9 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-24 23:14:40,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 71 transitions. [2023-11-24 23:14:40,326 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 71 transitions. Word has length 24 [2023-11-24 23:14:40,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:14:40,327 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 71 transitions. [2023-11-24 23:14:40,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:14:40,327 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 71 transitions. [2023-11-24 23:14:40,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-24 23:14:40,330 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:14:40,330 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:14:40,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:14:40,331 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:14:40,331 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:14:40,331 INFO L85 PathProgramCache]: Analyzing trace with hash -529013435, now seen corresponding path program 1 times [2023-11-24 23:14:40,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:14:40,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215905307] [2023-11-24 23:14:40,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:40,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:14:40,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:40,639 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:40,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:14:40,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215905307] [2023-11-24 23:14:40,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215905307] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:14:40,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267734452] [2023-11-24 23:14:40,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:40,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:14:40,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:14:40,650 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:14:40,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:14:40,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:40,769 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-24 23:14:40,777 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:14:41,024 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:14:41,024 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:14:41,372 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:41,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267734452] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:14:41,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425165353] [2023-11-24 23:14:41,393 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-24 23:14:41,394 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:14:41,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:14:41,403 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:14:41,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:14:41,992 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:14:42,002 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:14:43,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [425165353] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:14:43,587 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:14:43,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [9, 11, 9] total 36 [2023-11-24 23:14:43,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120318834] [2023-11-24 23:14:43,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:14:43,590 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-24 23:14:43,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:14:43,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-24 23:14:43,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:14:43,592 INFO L87 Difference]: Start difference. First operand 49 states and 71 transitions. Second operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:14:44,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:14:44,462 INFO L93 Difference]: Finished difference Result 132 states and 213 transitions. [2023-11-24 23:14:44,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 23:14:44,463 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2023-11-24 23:14:44,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:14:44,466 INFO L225 Difference]: With dead ends: 132 [2023-11-24 23:14:44,466 INFO L226 Difference]: Without dead ends: 118 [2023-11-24 23:14:44,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:14:44,469 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 108 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-24 23:14:44,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 225 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-24 23:14:44,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-11-24 23:14:44,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 60. [2023-11-24 23:14:44,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 44 states have (on average 1.3181818181818181) internal successors, (58), 46 states have internal predecessors, (58), 11 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (22), 12 states have call predecessors, (22), 10 states have call successors, (22) [2023-11-24 23:14:44,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 91 transitions. [2023-11-24 23:14:44,496 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 91 transitions. Word has length 27 [2023-11-24 23:14:44,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:14:44,497 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 91 transitions. [2023-11-24 23:14:44,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:14:44,497 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 91 transitions. [2023-11-24 23:14:44,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 23:14:44,500 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:14:44,500 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:14:44,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:14:44,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:14:44,717 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:14:44,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:14:44,718 INFO L85 PathProgramCache]: Analyzing trace with hash -991510392, now seen corresponding path program 1 times [2023-11-24 23:14:44,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:14:44,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382975309] [2023-11-24 23:14:44,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:44,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:14:44,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:45,432 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:45,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:14:45,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382975309] [2023-11-24 23:14:45,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382975309] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:14:45,441 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:14:45,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2023-11-24 23:14:45,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698496763] [2023-11-24 23:14:45,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:14:45,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-24 23:14:45,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:14:45,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-24 23:14:45,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2023-11-24 23:14:45,444 INFO L87 Difference]: Start difference. First operand 60 states and 91 transitions. Second operand has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:14:45,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:14:45,834 INFO L93 Difference]: Finished difference Result 95 states and 141 transitions. [2023-11-24 23:14:45,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-24 23:14:45,835 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2023-11-24 23:14:45,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:14:45,839 INFO L225 Difference]: With dead ends: 95 [2023-11-24 23:14:45,840 INFO L226 Difference]: Without dead ends: 80 [2023-11-24 23:14:45,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:14:45,844 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 47 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:14:45,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 626 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:14:45,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-24 23:14:45,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 61. [2023-11-24 23:14:45,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 47 states have internal predecessors, (57), 13 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (22), 12 states have call predecessors, (22), 11 states have call successors, (22) [2023-11-24 23:14:45,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 92 transitions. [2023-11-24 23:14:45,882 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 92 transitions. Word has length 28 [2023-11-24 23:14:45,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:14:45,882 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 92 transitions. [2023-11-24 23:14:45,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:14:45,883 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 92 transitions. [2023-11-24 23:14:45,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 23:14:45,885 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:14:45,885 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:14:45,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:14:45,886 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:14:45,886 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:14:45,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1532267631, now seen corresponding path program 1 times [2023-11-24 23:14:45,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:14:45,887 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199112485] [2023-11-24 23:14:45,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:45,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:14:45,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:46,513 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:46,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:14:46,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199112485] [2023-11-24 23:14:46,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199112485] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:14:46,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908233449] [2023-11-24 23:14:46,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:46,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:14:46,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:14:46,523 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:14:46,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:14:46,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:46,618 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-24 23:14:46,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:14:46,706 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:14:46,707 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:14:52,418 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:52,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908233449] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:14:52,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1726348575] [2023-11-24 23:14:52,422 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-24 23:14:52,422 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:14:52,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:14:52,423 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:14:52,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:14:52,882 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-11-24 23:14:52,992 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-11-24 23:14:53,932 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-11-24 23:14:54,420 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-11-24 23:14:54,427 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 47 for LOIs [2023-11-24 23:14:54,647 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:14:56,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1100#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-24 23:14:56,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:14:56,869 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:14:56,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 8] total 17 [2023-11-24 23:14:56,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031491729] [2023-11-24 23:14:56,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:14:56,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-24 23:14:56,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:14:56,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-24 23:14:56,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:14:56,872 INFO L87 Difference]: Start difference. First operand 61 states and 92 transitions. Second operand has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-24 23:14:57,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:14:57,795 INFO L93 Difference]: Finished difference Result 141 states and 209 transitions. [2023-11-24 23:14:57,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-24 23:14:57,796 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 28 [2023-11-24 23:14:57,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:14:57,797 INFO L225 Difference]: With dead ends: 141 [2023-11-24 23:14:57,797 INFO L226 Difference]: Without dead ends: 86 [2023-11-24 23:14:57,799 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=138, Invalid=1194, Unknown=0, NotChecked=0, Total=1332 [2023-11-24 23:14:57,800 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 32 mSDsluCounter, 534 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:14:57,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 578 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:14:57,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-11-24 23:14:57,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 63. [2023-11-24 23:14:57,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 48 states have internal predecessors, (60), 12 states have call successors, (12), 3 states have call predecessors, (12), 4 states have return successors, (17), 12 states have call predecessors, (17), 10 states have call successors, (17) [2023-11-24 23:14:57,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 89 transitions. [2023-11-24 23:14:57,822 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 89 transitions. Word has length 28 [2023-11-24 23:14:57,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:14:57,823 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 89 transitions. [2023-11-24 23:14:57,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-24 23:14:57,824 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 89 transitions. [2023-11-24 23:14:57,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-24 23:14:57,828 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:14:57,829 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:14:57,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:14:58,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:14:58,035 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:14:58,036 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:14:58,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1344494665, now seen corresponding path program 1 times [2023-11-24 23:14:58,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:14:58,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036952045] [2023-11-24 23:14:58,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:58,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:14:58,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:58,264 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:58,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:14:58,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036952045] [2023-11-24 23:14:58,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036952045] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:14:58,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023367047] [2023-11-24 23:14:58,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:14:58,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:14:58,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:14:58,269 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:14:58,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:14:58,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:14:58,353 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-24 23:14:58,355 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:14:58,493 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:14:58,493 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:14:58,752 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:14:58,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023367047] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:14:58,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [836765477] [2023-11-24 23:14:58,755 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-24 23:14:58,755 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:14:58,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:14:58,756 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:14:58,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:14:59,128 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:14:59,160 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:15:00,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [836765477] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:00,693 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:15:00,693 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [8, 11, 9] total 37 [2023-11-24 23:15:00,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033348289] [2023-11-24 23:15:00,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:00,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-24 23:15:00,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:00,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-24 23:15:00,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1200, Unknown=0, NotChecked=0, Total=1332 [2023-11-24 23:15:00,696 INFO L87 Difference]: Start difference. First operand 63 states and 89 transitions. Second operand has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:15:02,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:02,482 INFO L93 Difference]: Finished difference Result 109 states and 155 transitions. [2023-11-24 23:15:02,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-24 23:15:02,483 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2023-11-24 23:15:02,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:02,485 INFO L225 Difference]: With dead ends: 109 [2023-11-24 23:15:02,485 INFO L226 Difference]: Without dead ends: 95 [2023-11-24 23:15:02,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=198, Invalid=1608, Unknown=0, NotChecked=0, Total=1806 [2023-11-24 23:15:02,488 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 65 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:02,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 251 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-24 23:15:02,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-24 23:15:02,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 67. [2023-11-24 23:15:02,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 49 states have (on average 1.3061224489795917) internal successors, (64), 52 states have internal predecessors, (64), 12 states have call successors, (12), 3 states have call predecessors, (12), 5 states have return successors, (20), 12 states have call predecessors, (20), 10 states have call successors, (20) [2023-11-24 23:15:02,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 96 transitions. [2023-11-24 23:15:02,508 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 96 transitions. Word has length 30 [2023-11-24 23:15:02,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:02,508 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 96 transitions. [2023-11-24 23:15:02,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:15:02,509 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 96 transitions. [2023-11-24 23:15:02,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-24 23:15:02,510 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:02,510 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:02,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:15:02,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:02,717 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:15:02,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:02,718 INFO L85 PathProgramCache]: Analyzing trace with hash 30696943, now seen corresponding path program 1 times [2023-11-24 23:15:02,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:02,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009551907] [2023-11-24 23:15:02,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:02,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:02,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:02,964 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:15:02,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:02,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009551907] [2023-11-24 23:15:02,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009551907] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:15:02,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902910160] [2023-11-24 23:15:02,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:02,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:02,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:15:02,967 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:15:02,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:15:03,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:03,045 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-24 23:15:03,047 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:15:03,179 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:15:03,179 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:15:03,401 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:15:03,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902910160] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:15:03,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178990332] [2023-11-24 23:15:03,404 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-24 23:15:03,404 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:15:03,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:15:03,405 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:15:03,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:15:03,872 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 47 for LOIs [2023-11-24 23:15:04,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:15:06,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1178990332] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:06,316 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:15:06,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [9, 11, 9] total 35 [2023-11-24 23:15:06,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436726275] [2023-11-24 23:15:06,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:06,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:15:06,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:06,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:15:06,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1085, Unknown=0, NotChecked=0, Total=1190 [2023-11-24 23:15:06,319 INFO L87 Difference]: Start difference. First operand 67 states and 96 transitions. Second operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-24 23:15:07,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:07,787 INFO L93 Difference]: Finished difference Result 97 states and 137 transitions. [2023-11-24 23:15:07,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-24 23:15:07,788 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 31 [2023-11-24 23:15:07,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:07,789 INFO L225 Difference]: With dead ends: 97 [2023-11-24 23:15:07,789 INFO L226 Difference]: Without dead ends: 76 [2023-11-24 23:15:07,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=152, Invalid=1408, Unknown=0, NotChecked=0, Total=1560 [2023-11-24 23:15:07,798 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 64 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:07,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 148 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-24 23:15:07,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-24 23:15:07,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 57. [2023-11-24 23:15:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 45 states have internal predecessors, (58), 9 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-24 23:15:07,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2023-11-24 23:15:07,828 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2023-11-24 23:15:07,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:07,828 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2023-11-24 23:15:07,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-24 23:15:07,829 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2023-11-24 23:15:07,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-24 23:15:07,829 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:07,830 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:07,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:15:08,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:08,033 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:15:08,033 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:08,033 INFO L85 PathProgramCache]: Analyzing trace with hash -820357858, now seen corresponding path program 1 times [2023-11-24 23:15:08,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:08,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027013161] [2023-11-24 23:15:08,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:08,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:08,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:09,427 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:15:09,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:09,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027013161] [2023-11-24 23:15:09,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027013161] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:15:09,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586890832] [2023-11-24 23:15:09,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:09,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:09,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:15:09,431 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:15:09,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:15:09,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:09,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-24 23:15:09,512 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:15:09,954 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:15:09,954 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:15:10,487 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:15:10,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586890832] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:15:10,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133168557] [2023-11-24 23:15:10,499 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-11-24 23:15:10,499 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:15:10,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:15:10,500 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:15:10,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:15:11,127 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 126 for LOIs [2023-11-24 23:15:11,300 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 47 for LOIs [2023-11-24 23:15:11,426 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:15:15,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2133168557] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:15,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:15:15,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [15, 14, 13] total 49 [2023-11-24 23:15:15,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703480243] [2023-11-24 23:15:15,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:15,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:15:15,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:15,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:15:15,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2183, Unknown=0, NotChecked=0, Total=2352 [2023-11-24 23:15:15,846 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand has 18 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-24 23:15:17,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:17,225 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2023-11-24 23:15:17,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-24 23:15:17,226 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2023-11-24 23:15:17,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:17,227 INFO L225 Difference]: With dead ends: 82 [2023-11-24 23:15:17,227 INFO L226 Difference]: Without dead ends: 74 [2023-11-24 23:15:17,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=216, Invalid=2646, Unknown=0, NotChecked=0, Total=2862 [2023-11-24 23:15:17,230 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 71 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:17,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 104 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-24 23:15:17,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-24 23:15:17,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 57. [2023-11-24 23:15:17,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 45 states have internal predecessors, (58), 9 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-24 23:15:17,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2023-11-24 23:15:17,248 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 32 [2023-11-24 23:15:17,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:17,248 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2023-11-24 23:15:17,249 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 1.25) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-24 23:15:17,249 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2023-11-24 23:15:17,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-24 23:15:17,250 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:17,250 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:17,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-24 23:15:17,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:15:17,456 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:15:17,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:17,456 INFO L85 PathProgramCache]: Analyzing trace with hash 208726149, now seen corresponding path program 2 times [2023-11-24 23:15:17,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:17,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061138816] [2023-11-24 23:15:17,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:17,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:17,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:19,370 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:15:19,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:19,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061138816] [2023-11-24 23:15:19,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061138816] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:15:19,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36329264] [2023-11-24 23:15:19,371 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:15:19,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:19,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:15:19,372 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:15:19,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72463d89-b31d-46fc-827c-efbbe3b73c13/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:15:20,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-24 23:15:20,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:15:20,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-24 23:15:20,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:15:20,640 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-24 23:15:20,640 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:15:20,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36329264] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:20,641 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:15:20,641 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [15] total 18 [2023-11-24 23:15:20,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016434737] [2023-11-24 23:15:20,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:20,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:15:20,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:20,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:15:20,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:15:20,643 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)