./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_3a.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_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/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_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/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_cd0ba89a-3787-4a26-9115-4eb636527020/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 95f89ee6bcff8f17eb3e93b344abecdfb8ddea0894d1b25afafccf6235d7ced6 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:55:35,665 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:55:35,735 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:55:35,742 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:55:35,742 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:55:35,768 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:55:35,769 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:55:35,769 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:55:35,770 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:55:35,772 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:55:35,772 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:55:35,774 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:55:35,774 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:55:35,780 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:55:35,781 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:55:35,781 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:55:35,783 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:55:35,784 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:55:35,784 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:55:35,785 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:55:35,786 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:55:35,786 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:55:35,788 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:55:35,788 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:55:35,789 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:55:35,789 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:55:35,790 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:55:35,790 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:55:35,791 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:55:35,791 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:55:35,793 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:55:35,793 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:55:35,794 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:55:35,794 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:55:35,794 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:55:35,795 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:55:35,795 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:55:35,795 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:55:35,796 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:55:35,796 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:55:35,797 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:55:35,797 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:55:35,797 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:55:35,798 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:55:35,798 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:55:35,799 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:55:35,799 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:55:35,799 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_cd0ba89a-3787-4a26-9115-4eb636527020/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 95f89ee6bcff8f17eb3e93b344abecdfb8ddea0894d1b25afafccf6235d7ced6 [2023-11-24 23:55:36,130 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:55:36,159 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:55:36,163 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:55:36,166 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:55:36,167 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:55:36,168 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c [2023-11-24 23:55:39,294 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:55:39,513 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:55:39,514 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c [2023-11-24 23:55:39,524 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/data/d6d1cc223/abdfc568ff694fbb9dd705db091ba29a/FLAG01e612ba7 [2023-11-24 23:55:39,540 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/data/d6d1cc223/abdfc568ff694fbb9dd705db091ba29a [2023-11-24 23:55:39,543 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:55:39,544 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:55:39,546 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:55:39,546 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:55:39,559 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:55:39,560 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:55:39" (1/1) ... [2023-11-24 23:55:39,561 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45ec8bde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:39, skipping insertion in model container [2023-11-24 23:55:39,561 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:55:39" (1/1) ... [2023-11-24 23:55:39,604 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:55:39,819 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_cd0ba89a-3787-4a26-9115-4eb636527020/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c[728,741] [2023-11-24 23:55:39,902 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:55:39,928 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:55:39,943 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_cd0ba89a-3787-4a26-9115-4eb636527020/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c[728,741] [2023-11-24 23:55:40,000 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:55:40,022 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:55:40,022 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40 WrapperNode [2023-11-24 23:55:40,022 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:55:40,024 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:55:40,024 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:55:40,024 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:55:40,032 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,051 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,080 INFO L138 Inliner]: procedures = 17, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 146 [2023-11-24 23:55:40,080 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:55:40,081 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:55:40,081 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:55:40,082 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:55:40,092 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,092 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,095 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,095 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,102 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,108 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,110 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,112 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,115 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:55:40,117 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:55:40,117 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:55:40,117 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:55:40,118 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (1/1) ... [2023-11-24 23:55:40,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:55:40,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:40,154 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:55:40,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:55:40,218 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:55:40,219 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:55:40,219 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2023-11-24 23:55:40,219 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2023-11-24 23:55:40,221 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:55:40,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:55:40,223 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-24 23:55:40,223 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-24 23:55:40,304 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:55:40,308 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:55:40,722 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:55:40,916 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:55:40,917 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-24 23:55:40,918 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:55:40 BoogieIcfgContainer [2023-11-24 23:55:40,919 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:55:40,943 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:55:40,943 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:55:40,947 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:55:40,947 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:55:39" (1/3) ... [2023-11-24 23:55:40,948 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50eb171a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:55:40, skipping insertion in model container [2023-11-24 23:55:40,948 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:40" (2/3) ... [2023-11-24 23:55:40,949 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50eb171a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:55:40, skipping insertion in model container [2023-11-24 23:55:40,950 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:55:40" (3/3) ... [2023-11-24 23:55:40,951 INFO L112 eAbstractionObserver]: Analyzing ICFG soft_float_3a.c.cil.c [2023-11-24 23:55:40,997 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:55:40,998 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:55:41,048 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:55:41,055 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;@685ac9aa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:55:41,056 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:55:41,060 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 32 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-24 23:55:41,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-24 23:55:41,070 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:41,071 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:55:41,071 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:41,077 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:41,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1647763528, now seen corresponding path program 1 times [2023-11-24 23:55:41,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:41,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408579870] [2023-11-24 23:55:41,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:41,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:41,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:41,619 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:41,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:41,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408579870] [2023-11-24 23:55:41,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408579870] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:41,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786243617] [2023-11-24 23:55:41,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:41,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:41,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:41,627 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:41,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:55:41,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:41,732 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-24 23:55:41,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:41,939 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:55:41,939 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:42,380 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:55:42,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786243617] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:42,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135949470] [2023-11-24 23:55:42,413 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-24 23:55:42,413 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:42,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:42,424 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:42,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:42,689 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 43 for LOIs [2023-11-24 23:55:42,825 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:43,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [135949470] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:55:43,785 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:43,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [4, 13, 11] total 30 [2023-11-24 23:55:43,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832535739] [2023-11-24 23:55:43,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:55:43,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-24 23:55:43,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:43,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-24 23:55:43,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=775, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:55:43,833 INFO L87 Difference]: Start difference. First operand has 39 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 32 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-24 23:55:44,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:44,187 INFO L93 Difference]: Finished difference Result 107 states and 170 transitions. [2023-11-24 23:55:44,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 23:55:44,190 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2023-11-24 23:55:44,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:44,202 INFO L225 Difference]: With dead ends: 107 [2023-11-24 23:55:44,202 INFO L226 Difference]: Without dead ends: 65 [2023-11-24 23:55:44,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=95, Invalid=775, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:55:44,213 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 69 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:44,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 136 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:55:44,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-24 23:55:44,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 48. [2023-11-24 23:55:44,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.3846153846153846) internal successors, (54), 40 states have internal predecessors, (54), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-24 23:55:44,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 64 transitions. [2023-11-24 23:55:44,278 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 64 transitions. Word has length 32 [2023-11-24 23:55:44,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:44,278 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 64 transitions. [2023-11-24 23:55:44,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-24 23:55:44,279 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 64 transitions. [2023-11-24 23:55:44,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-24 23:55:44,284 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:44,284 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 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 23:55:44,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:44,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-24 23:55:44,500 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:44,501 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:44,501 INFO L85 PathProgramCache]: Analyzing trace with hash -4392137, now seen corresponding path program 1 times [2023-11-24 23:55:44,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:44,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342407155] [2023-11-24 23:55:44,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:44,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:44,808 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:44,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:44,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342407155] [2023-11-24 23:55:44,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342407155] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:44,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935035831] [2023-11-24 23:55:44,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:44,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:44,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:44,815 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:44,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:55:44,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:44,922 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-24 23:55:44,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:45,064 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:55:45,064 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:45,411 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:55:45,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935035831] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:45,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167191639] [2023-11-24 23:55:45,416 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-11-24 23:55:45,416 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:45,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:45,418 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:45,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:46,120 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-24 23:55:46,259 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:55:46,357 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:48,755 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '689#(and (= (select |#length| 3) 12) (<= 1 |#StackHeapBarrier|) (= 22 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (exists ((|v_ULTIMATE.start_mulflt_~b#1_30| Int) (|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_mulflt_~a#1_24| Int) (|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_1| Int)) (and (= (mod |v_ULTIMATE.start_mulflt_~b#1_30| 4294967296) 0) (= |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_5| |v_ULTIMATE.start_mulflt_~a#1_24|) (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_1| |v_ULTIMATE.start_mulflt_~b#1_30|) (<= 1 (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_5| 4294967296)) (= (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_1| 4294967296) (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_1| 4294967296)))))' at error location [2023-11-24 23:55:48,755 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:48,755 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:48,755 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 13, 11] total 24 [2023-11-24 23:55:48,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795140930] [2023-11-24 23:55:48,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:48,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-24 23:55:48,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:48,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-24 23:55:48,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1427, Unknown=0, NotChecked=0, Total=1560 [2023-11-24 23:55:48,760 INFO L87 Difference]: Start difference. First operand 48 states and 64 transitions. Second operand has 24 states, 21 states have (on average 2.380952380952381) internal successors, (50), 20 states have internal predecessors, (50), 5 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:55:49,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:49,625 INFO L93 Difference]: Finished difference Result 146 states and 203 transitions. [2023-11-24 23:55:49,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-24 23:55:49,626 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 2.380952380952381) internal successors, (50), 20 states have internal predecessors, (50), 5 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) Word has length 37 [2023-11-24 23:55:49,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:49,633 INFO L225 Difference]: With dead ends: 146 [2023-11-24 23:55:49,634 INFO L226 Difference]: Without dead ends: 92 [2023-11-24 23:55:49,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=233, Invalid=2317, Unknown=0, NotChecked=0, Total=2550 [2023-11-24 23:55:49,638 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 80 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:49,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 527 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:55:49,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-24 23:55:49,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 59. [2023-11-24 23:55:49,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 48 states have (on average 1.3333333333333333) internal successors, (64), 48 states have internal predecessors, (64), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-24 23:55:49,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 78 transitions. [2023-11-24 23:55:49,672 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 78 transitions. Word has length 37 [2023-11-24 23:55:49,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:49,673 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 78 transitions. [2023-11-24 23:55:49,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 2.380952380952381) internal successors, (50), 20 states have internal predecessors, (50), 5 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:55:49,673 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 78 transitions. [2023-11-24 23:55:49,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-24 23:55:49,676 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:49,677 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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, 1, 1] [2023-11-24 23:55:49,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:49,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:49,883 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:49,883 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:49,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1674075693, now seen corresponding path program 1 times [2023-11-24 23:55:49,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:49,884 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327375980] [2023-11-24 23:55:49,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:49,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:49,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:50,040 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:50,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:50,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327375980] [2023-11-24 23:55:50,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327375980] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:50,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415612865] [2023-11-24 23:55:50,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:50,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:50,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:50,043 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:50,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:55:50,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:50,146 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:55:50,150 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:50,196 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:55:50,197 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:50,283 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:50,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415612865] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:50,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404496539] [2023-11-24 23:55:50,288 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-11-24 23:55:50,289 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:50,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:50,290 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:50,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:50,729 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:55:50,838 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:51,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [404496539] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:55:51,824 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:51,824 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [5, 5, 5] total 27 [2023-11-24 23:55:51,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422151179] [2023-11-24 23:55:51,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:55:51,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:55:51,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:51,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:55:51,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2023-11-24 23:55:51,827 INFO L87 Difference]: Start difference. First operand 59 states and 78 transitions. Second operand has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-24 23:55:52,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:52,833 INFO L93 Difference]: Finished difference Result 117 states and 173 transitions. [2023-11-24 23:55:52,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:55:52,834 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2023-11-24 23:55:52,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:52,836 INFO L225 Difference]: With dead ends: 117 [2023-11-24 23:55:52,837 INFO L226 Difference]: Without dead ends: 102 [2023-11-24 23:55:52,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=202, Invalid=988, Unknown=0, NotChecked=0, Total=1190 [2023-11-24 23:55:52,839 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 125 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:52,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 287 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:55:52,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-24 23:55:52,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2023-11-24 23:55:52,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2023-11-24 23:55:52,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 87 transitions. [2023-11-24 23:55:52,875 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 87 transitions. Word has length 39 [2023-11-24 23:55:52,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:52,876 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 87 transitions. [2023-11-24 23:55:52,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-24 23:55:52,876 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 87 transitions. [2023-11-24 23:55:52,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-24 23:55:52,885 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:52,886 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 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, 1, 1] [2023-11-24 23:55:52,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:53,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-24 23:55:53,093 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:53,094 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:53,094 INFO L85 PathProgramCache]: Analyzing trace with hash -275361518, now seen corresponding path program 1 times [2023-11-24 23:55:53,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:53,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132125632] [2023-11-24 23:55:53,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:53,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:53,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:53,454 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:53,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:53,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132125632] [2023-11-24 23:55:53,457 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132125632] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:53,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140667605] [2023-11-24 23:55:53,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:53,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:53,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:53,458 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:53,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:55:53,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:53,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-24 23:55:53,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:53,673 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:55:53,674 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:53,940 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:55:53,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140667605] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:53,941 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:55:53,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 10] total 19 [2023-11-24 23:55:53,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418058976] [2023-11-24 23:55:53,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:55:53,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:55:53,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:53,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:55:53,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:55:53,943 INFO L87 Difference]: Start difference. First operand 65 states and 87 transitions. Second operand has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-24 23:55:54,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:54,064 INFO L93 Difference]: Finished difference Result 85 states and 113 transitions. [2023-11-24 23:55:54,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:55:54,065 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 41 [2023-11-24 23:55:54,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:54,066 INFO L225 Difference]: With dead ends: 85 [2023-11-24 23:55:54,066 INFO L226 Difference]: Without dead ends: 68 [2023-11-24 23:55:54,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2023-11-24 23:55:54,068 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:54,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 195 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:55:54,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-24 23:55:54,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 61. [2023-11-24 23:55:54,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.32) internal successors, (66), 49 states have internal predecessors, (66), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2023-11-24 23:55:54,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 79 transitions. [2023-11-24 23:55:54,099 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 79 transitions. Word has length 41 [2023-11-24 23:55:54,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:54,099 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 79 transitions. [2023-11-24 23:55:54,100 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-24 23:55:54,100 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 79 transitions. [2023-11-24 23:55:54,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-24 23:55:54,102 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:54,102 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 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, 1, 1, 1, 1] [2023-11-24 23:55:54,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:54,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:54,309 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:54,309 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:54,310 INFO L85 PathProgramCache]: Analyzing trace with hash 47388505, now seen corresponding path program 1 times [2023-11-24 23:55:54,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:54,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964930417] [2023-11-24 23:55:54,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:54,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:54,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:54,410 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:54,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:54,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964930417] [2023-11-24 23:55:54,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964930417] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:54,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670369776] [2023-11-24 23:55:54,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:54,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:54,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:54,412 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:54,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:55:54,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:54,485 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:55:54,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:54,521 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:55:54,522 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:54,602 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:54,602 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670369776] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:54,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [487031392] [2023-11-24 23:55:54,605 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-24 23:55:54,606 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:54,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:54,607 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:54,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:55,048 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-24 23:55:55,138 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:55:55,268 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:56,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2167#(and (= (select |#length| 3) 12) (<= 1 |#StackHeapBarrier|) (= 22 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (exists ((|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_mulflt_~a#1_31| Int) (|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_mulflt_~b#1_37| Int)) (and (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_2| |v_ULTIMATE.start_mulflt_~b#1_37|) (= (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_2| 4294967296) (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_8| 4294967296)) (= (mod |v_ULTIMATE.start_mulflt_~b#1_37| 4294967296) 0) (<= 1 (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_11| 4294967296)) (= |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_mulflt_~a#1_31|))))' at error location [2023-11-24 23:55:56,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:56,869 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:56,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2023-11-24 23:55:56,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748427314] [2023-11-24 23:55:56,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:56,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-24 23:55:56,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:56,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-24 23:55:56,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=627, Unknown=0, NotChecked=0, Total=756 [2023-11-24 23:55:56,872 INFO L87 Difference]: Start difference. First operand 61 states and 79 transitions. Second operand has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-24 23:55:57,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:57,142 INFO L93 Difference]: Finished difference Result 159 states and 222 transitions. [2023-11-24 23:55:57,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:55:57,143 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 42 [2023-11-24 23:55:57,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:57,145 INFO L225 Difference]: With dead ends: 159 [2023-11-24 23:55:57,146 INFO L226 Difference]: Without dead ends: 114 [2023-11-24 23:55:57,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=174, Invalid=818, Unknown=0, NotChecked=0, Total=992 [2023-11-24 23:55:57,148 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 36 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:57,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 186 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:55:57,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-24 23:55:57,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 69. [2023-11-24 23:55:57,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 58 states have (on average 1.3103448275862069) internal successors, (76), 57 states have internal predecessors, (76), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2023-11-24 23:55:57,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 89 transitions. [2023-11-24 23:55:57,170 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 89 transitions. Word has length 42 [2023-11-24 23:55:57,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:57,170 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 89 transitions. [2023-11-24 23:55:57,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-24 23:55:57,171 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 89 transitions. [2023-11-24 23:55:57,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-24 23:55:57,172 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:57,172 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 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, 1, 1] [2023-11-24 23:55:57,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:57,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:57,383 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:57,384 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:57,384 INFO L85 PathProgramCache]: Analyzing trace with hash 911212116, now seen corresponding path program 1 times [2023-11-24 23:55:57,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:57,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314743349] [2023-11-24 23:55:57,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:57,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:57,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:57,695 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:57,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:57,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314743349] [2023-11-24 23:55:57,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314743349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:57,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192362917] [2023-11-24 23:55:57,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:57,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:57,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:57,698 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:57,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:55:57,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:57,787 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 52 conjunts are in the unsatisfiable core [2023-11-24 23:55:57,793 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:58,534 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-24 23:55:58,534 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:59,899 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:55:59,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192362917] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:59,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [572075490] [2023-11-24 23:55:59,902 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-24 23:55:59,903 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:59,903 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:59,903 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:59,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:56:00,292 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-24 23:56:00,385 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:56:00,525 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:56:02,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2765#(and (= (select |#length| 3) 12) (<= 1 |#StackHeapBarrier|) (= 22 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= (select (select |#memory_int| 1) 0) 48) (exists ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_13| Int) (|v_ULTIMATE.start_mulflt_~a#1_34| Int) (|v_ULTIMATE.start_mulflt_~b#1_40| Int) (|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_13| Int)) (and (<= 1 (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_13| 4294967296)) (= |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_13| |v_ULTIMATE.start_mulflt_~a#1_34|) (= (mod |v_ULTIMATE.start_mulflt_~b#1_40| 4294967296) 0) (= (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_3| 4294967296) (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_13| 4294967296)) (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_3| |v_ULTIMATE.start_mulflt_~b#1_40|))) (= (select (select |#memory_int| 1) 1) 0))' at error location [2023-11-24 23:56:02,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:56:02,940 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:02,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 17, 17] total 36 [2023-11-24 23:56:02,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462209852] [2023-11-24 23:56:02,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:02,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-24 23:56:02,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:02,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-24 23:56:02,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=2464, Unknown=0, NotChecked=0, Total=2652 [2023-11-24 23:56:02,945 INFO L87 Difference]: Start difference. First operand 69 states and 89 transitions. Second operand has 36 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 6 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (11), 7 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-24 23:56:08,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:08,212 INFO L93 Difference]: Finished difference Result 244 states and 410 transitions. [2023-11-24 23:56:08,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-11-24 23:56:08,216 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 6 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (11), 7 states have call predecessors, (11), 5 states have call successors, (11) Word has length 44 [2023-11-24 23:56:08,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:08,219 INFO L225 Difference]: With dead ends: 244 [2023-11-24 23:56:08,219 INFO L226 Difference]: Without dead ends: 193 [2023-11-24 23:56:08,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2501 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=869, Invalid=8637, Unknown=0, NotChecked=0, Total=9506 [2023-11-24 23:56:08,226 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 219 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 1467 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 1500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:08,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 483 Invalid, 1500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1467 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-24 23:56:08,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2023-11-24 23:56:08,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 82. [2023-11-24 23:56:08,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 67 states have internal predecessors, (88), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (11), 10 states have call predecessors, (11), 7 states have call successors, (11) [2023-11-24 23:56:08,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 107 transitions. [2023-11-24 23:56:08,291 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 107 transitions. Word has length 44 [2023-11-24 23:56:08,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:08,292 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 107 transitions. [2023-11-24 23:56:08,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 6 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (11), 7 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-24 23:56:08,292 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 107 transitions. [2023-11-24 23:56:08,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-24 23:56:08,294 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:08,294 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 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, 1, 1] [2023-11-24 23:56:08,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:08,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:08,507 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:56:08,508 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:08,508 INFO L85 PathProgramCache]: Analyzing trace with hash -2038379471, now seen corresponding path program 1 times [2023-11-24 23:56:08,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:08,508 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105359020] [2023-11-24 23:56:08,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:08,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:08,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:08,886 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:56:08,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:08,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105359020] [2023-11-24 23:56:08,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105359020] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:08,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65902910] [2023-11-24 23:56:08,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:08,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:08,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:08,888 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:08,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:56:08,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:08,977 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-24 23:56:08,980 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:09,097 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-24 23:56:09,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:09,352 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-24 23:56:09,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65902910] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:09,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326688905] [2023-11-24 23:56:09,354 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2023-11-24 23:56:09,355 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:09,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:56:09,355 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:56:09,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:56:09,785 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-11-24 23:56:09,799 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:56:09,916 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:56:10,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3574#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_16| Int)) (<= (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_16| 4294967296) 4294967294)) (exists ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_14| Int)) (= (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_4| 4294967296) (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_14| 4294967296))))' at error location [2023-11-24 23:56:10,975 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:56:10,975 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:10,975 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8] total 20 [2023-11-24 23:56:10,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682342960] [2023-11-24 23:56:10,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:10,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-24 23:56:10,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:10,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-24 23:56:10,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1206, Unknown=0, NotChecked=0, Total=1332 [2023-11-24 23:56:10,978 INFO L87 Difference]: Start difference. First operand 82 states and 107 transitions. Second operand has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 17 states have internal predecessors, (52), 4 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:56:12,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:12,053 INFO L93 Difference]: Finished difference Result 157 states and 225 transitions. [2023-11-24 23:56:12,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-24 23:56:12,053 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 17 states have internal predecessors, (52), 4 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) Word has length 48 [2023-11-24 23:56:12,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:12,055 INFO L225 Difference]: With dead ends: 157 [2023-11-24 23:56:12,055 INFO L226 Difference]: Without dead ends: 111 [2023-11-24 23:56:12,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=279, Invalid=2477, Unknown=0, NotChecked=0, Total=2756 [2023-11-24 23:56:12,058 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 79 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:12,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 357 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:56:12,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-24 23:56:12,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 76. [2023-11-24 23:56:12,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 7 states have call successors, (7), 4 states have call predecessors, (7), 5 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-24 23:56:12,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 96 transitions. [2023-11-24 23:56:12,080 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 96 transitions. Word has length 48 [2023-11-24 23:56:12,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:12,081 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 96 transitions. [2023-11-24 23:56:12,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 17 states have internal predecessors, (52), 4 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:56:12,081 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 96 transitions. [2023-11-24 23:56:12,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-24 23:56:12,082 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:12,082 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 2, 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, 1, 1] [2023-11-24 23:56:12,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:12,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:56:12,291 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:56:12,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:12,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1306246965, now seen corresponding path program 2 times [2023-11-24 23:56:12,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:12,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915302151] [2023-11-24 23:56:12,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:12,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:12,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:12,439 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:56:12,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:12,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915302151] [2023-11-24 23:56:12,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915302151] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:12,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705633420] [2023-11-24 23:56:12,441 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:12,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:12,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:12,447 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:12,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:56:12,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-11-24 23:56:12,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:12,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-24 23:56:12,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:12,668 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 26 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:12,669 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:12,868 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:56:12,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705633420] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:12,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735683920] [2023-11-24 23:56:12,871 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-24 23:56:12,871 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:12,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:56:12,872 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:56:12,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:56:13,232 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-24 23:56:13,298 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:56:13,432 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:56:14,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4229#(and (= (select |#length| 3) 12) (<= 1 |#StackHeapBarrier|) (= 22 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (exists ((|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_17| Int) (|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_15| Int) (|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_mulflt_~a#1_39| Int) (|v_ULTIMATE.start_mulflt_~b#1_45| Int)) (and (= (mod |v_ULTIMATE.start_mulflt_~b#1_45| 4294967296) 0) (= |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_17| |v_ULTIMATE.start_mulflt_~a#1_39|) (<= 1 (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_17| 4294967296)) (= (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_15| 4294967296) (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_5| 4294967296)) (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_5| |v_ULTIMATE.start_mulflt_~b#1_45|))))' at error location [2023-11-24 23:56:14,928 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:56:14,928 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:14,928 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 20 [2023-11-24 23:56:14,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422579260] [2023-11-24 23:56:14,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:14,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-24 23:56:14,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:14,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-24 23:56:14,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1071, Unknown=0, NotChecked=0, Total=1332 [2023-11-24 23:56:14,931 INFO L87 Difference]: Start difference. First operand 76 states and 96 transitions. Second operand has 20 states, 20 states have (on average 4.05) internal successors, (81), 20 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-24 23:56:15,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:15,364 INFO L93 Difference]: Finished difference Result 225 states and 323 transitions. [2023-11-24 23:56:15,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-24 23:56:15,364 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.05) internal successors, (81), 20 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 51 [2023-11-24 23:56:15,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:15,367 INFO L225 Difference]: With dead ends: 225 [2023-11-24 23:56:15,367 INFO L226 Difference]: Without dead ends: 186 [2023-11-24 23:56:15,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 773 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=399, Invalid=1493, Unknown=0, NotChecked=0, Total=1892 [2023-11-24 23:56:15,369 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 101 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:15,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 210 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:56:15,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2023-11-24 23:56:15,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 90. [2023-11-24 23:56:15,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 77 states have (on average 1.2727272727272727) internal successors, (98), 77 states have internal predecessors, (98), 7 states have call successors, (7), 4 states have call predecessors, (7), 5 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-24 23:56:15,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions. [2023-11-24 23:56:15,401 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 51 [2023-11-24 23:56:15,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:15,401 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 113 transitions. [2023-11-24 23:56:15,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.05) internal successors, (81), 20 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-24 23:56:15,402 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions. [2023-11-24 23:56:15,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-11-24 23:56:15,403 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:15,403 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 2, 2, 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 23:56:15,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:15,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:56:15,618 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:56:15,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:15,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1831740852, now seen corresponding path program 2 times [2023-11-24 23:56:15,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:15,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39386456] [2023-11-24 23:56:15,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:15,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:15,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:15,980 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-24 23:56:15,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:15,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39386456] [2023-11-24 23:56:15,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39386456] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:15,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047484804] [2023-11-24 23:56:15,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:15,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:15,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:15,984 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:16,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0ba89a-3787-4a26-9115-4eb636527020/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-24 23:56:18,789 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-24 23:56:18,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:18,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-24 23:56:18,837 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:22,024 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-24 23:56:22,024 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-24 23:56:26,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047484804] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:26,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1804590853] [2023-11-24 23:56:26,039 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2023-11-24 23:56:26,039 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:26,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:56:26,040 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:56:26,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:56:26,398 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-11-24 23:56:26,412 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 11 for LOIs [2023-11-24 23:56:26,508 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:56:28,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5001#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_18| Int)) (<= (mod |v_ULTIMATE.start_main_~a~0#1_BEFORE_CALL_18| 4294967296) 4294967294)) (exists ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_16| Int)) (= (mod |v_ULTIMATE.start_main_~one~0#1_BEFORE_CALL_16| 4294967296) (mod |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_6| 4294967296))))' at error location [2023-11-24 23:56:28,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:56:28,437 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:28,437 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 12] total 29 [2023-11-24 23:56:28,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532508539] [2023-11-24 23:56:28,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:28,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-24 23:56:28,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:28,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-24 23:56:28,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1709, Unknown=0, NotChecked=0, Total=2070 [2023-11-24 23:56:28,440 INFO L87 Difference]: Start difference. First operand 90 states and 113 transitions. Second operand has 29 states, 29 states have (on average 2.6551724137931036) internal successors, (77), 29 states have internal predecessors, (77), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7)