./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2 --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 942b28ff7c0583b7db8395d2c315e70afc8fe68ba69d39faf867ac75d7628edb --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 11:25:35,532 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 11:25:35,629 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 11:25:35,634 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 11:25:35,635 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 11:25:35,669 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 11:25:35,670 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 11:25:35,670 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 11:25:35,671 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 11:25:35,671 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 11:25:35,671 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 11:25:35,672 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 11:25:35,672 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 11:25:35,672 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 11:25:35,673 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 11:25:35,675 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 11:25:35,676 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 11:25:35,680 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 11:25:35,680 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 11:25:35,681 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 11:25:35,681 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 11:25:35,683 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 11:25:35,684 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 11:25:35,684 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 11:25:35,684 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 11:25:35,684 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 11:25:35,684 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 11:25:35,685 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 11:25:35,686 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 11:25:35,686 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 11:25:35,687 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 11:25:35,688 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 11:25:35,688 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 11:25:35,688 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 11:25:35,688 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 11:25:35,689 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 11:25:35,689 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 11:25:35,689 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 11:25:35,689 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:25:35,690 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 11:25:35,690 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 11:25:35,690 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 11:25:35,690 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 11:25:35,691 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 11:25:35,691 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 11:25:35,691 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 11:25:35,691 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 11:25:35,691 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_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 942b28ff7c0583b7db8395d2c315e70afc8fe68ba69d39faf867ac75d7628edb [2024-11-02 11:25:36,052 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 11:25:36,094 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 11:25:36,097 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 11:25:36,099 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 11:25:36,100 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 11:25:36,102 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c Unable to find full path for "g++" [2024-11-02 11:25:38,420 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 11:25:38,655 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 11:25:38,655 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c [2024-11-02 11:25:38,671 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/data/250c2a388/bb072ebae58744b7894a13033cff6dc8/FLAG66ff67290 [2024-11-02 11:25:38,694 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/data/250c2a388/bb072ebae58744b7894a13033cff6dc8 [2024-11-02 11:25:38,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 11:25:38,700 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 11:25:38,704 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 11:25:38,704 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 11:25:38,711 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 11:25:38,712 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:25:38" (1/1) ... [2024-11-02 11:25:38,713 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@693d7e01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:38, skipping insertion in model container [2024-11-02 11:25:38,714 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:25:38" (1/1) ... [2024-11-02 11:25:38,745 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 11:25:39,045 WARN L251 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_2b975f38-7f4a-455d-9c70-a03bf24ea779/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c[588,601] [2024-11-02 11:25:39,076 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:25:39,090 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 11:25:39,105 WARN L251 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_2b975f38-7f4a-455d-9c70-a03bf24ea779/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_valuebound2.c[588,601] [2024-11-02 11:25:39,117 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:25:39,140 INFO L204 MainTranslator]: Completed translation [2024-11-02 11:25:39,141 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39 WrapperNode [2024-11-02 11:25:39,141 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 11:25:39,142 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 11:25:39,143 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 11:25:39,143 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 11:25:39,152 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,159 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,183 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2024-11-02 11:25:39,184 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 11:25:39,184 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 11:25:39,185 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 11:25:39,185 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 11:25:39,194 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,195 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,196 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,197 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,201 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,206 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,207 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,208 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,210 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 11:25:39,211 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 11:25:39,212 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 11:25:39,212 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 11:25:39,213 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (1/1) ... [2024-11-02 11:25:39,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:25:39,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:39,256 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 11:25:39,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 11:25:39,297 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 11:25:39,297 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 11:25:39,297 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 11:25:39,299 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 11:25:39,299 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-02 11:25:39,300 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-02 11:25:39,386 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 11:25:39,389 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 11:25:39,663 INFO L? ?]: Removed 6 outVars from TransFormulas that were not future-live. [2024-11-02 11:25:39,663 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 11:25:39,737 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 11:25:39,738 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-02 11:25:39,738 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:25:39 BoogieIcfgContainer [2024-11-02 11:25:39,738 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 11:25:39,744 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 11:25:39,744 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 11:25:39,749 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 11:25:39,749 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:25:38" (1/3) ... [2024-11-02 11:25:39,750 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6811340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:25:39, skipping insertion in model container [2024-11-02 11:25:39,751 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:39" (2/3) ... [2024-11-02 11:25:39,752 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6811340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:25:39, skipping insertion in model container [2024-11-02 11:25:39,752 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:25:39" (3/3) ... [2024-11-02 11:25:39,755 INFO L112 eAbstractionObserver]: Analyzing ICFG cohencu-ll_valuebound2.c [2024-11-02 11:25:39,775 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 11:25:39,775 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 11:25:39,858 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 11:25:39,867 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2db8af66, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 11:25:39,868 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 11:25:39,874 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-02 11:25:39,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2024-11-02 11:25:39,882 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:39,883 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2024-11-02 11:25:39,883 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:39,888 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:39,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1070258279, now seen corresponding path program 1 times [2024-11-02 11:25:39,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:39,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604711850] [2024-11-02 11:25:39,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:39,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:40,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:40,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:40,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:40,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604711850] [2024-11-02 11:25:40,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604711850] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:40,439 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:25:40,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-02 11:25:40,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183888565] [2024-11-02 11:25:40,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:40,449 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 11:25:40,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:40,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 11:25:40,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 11:25:40,484 INFO L87 Difference]: Start difference. First operand has 22 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:25:40,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:40,703 INFO L93 Difference]: Finished difference Result 47 states and 82 transitions. [2024-11-02 11:25:40,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 11:25:40,705 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2024-11-02 11:25:40,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:40,714 INFO L225 Difference]: With dead ends: 47 [2024-11-02 11:25:40,714 INFO L226 Difference]: Without dead ends: 24 [2024-11-02 11:25:40,717 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:25:40,721 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 4 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:40,725 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 75 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 11:25:40,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-02 11:25:40,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-02 11:25:40,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 10 states have (on average 1.2) internal successors, (12), 11 states have internal predecessors, (12), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2024-11-02 11:25:40,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2024-11-02 11:25:40,791 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 6 [2024-11-02 11:25:40,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:40,791 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2024-11-02 11:25:40,792 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:25:40,792 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2024-11-02 11:25:40,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-02 11:25:40,794 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:40,795 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:40,795 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 11:25:40,796 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:40,796 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:40,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1088770990, now seen corresponding path program 1 times [2024-11-02 11:25:40,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:40,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486186377] [2024-11-02 11:25:40,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:40,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:40,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:40,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1735138513] [2024-11-02 11:25:40,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:40,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:40,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:40,831 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:40,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 11:25:40,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:40,902 INFO L255 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 11:25:40,909 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:41,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:41,014 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 11:25:41,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:41,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486186377] [2024-11-02 11:25:41,016 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:41,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735138513] [2024-11-02 11:25:41,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735138513] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:41,018 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:25:41,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 11:25:41,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097640545] [2024-11-02 11:25:41,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:41,022 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 11:25:41,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:41,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 11:25:41,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 11:25:41,025 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-02 11:25:41,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:41,137 INFO L93 Difference]: Finished difference Result 43 states and 62 transitions. [2024-11-02 11:25:41,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 11:25:41,139 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2024-11-02 11:25:41,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:41,141 INFO L225 Difference]: With dead ends: 43 [2024-11-02 11:25:41,142 INFO L226 Difference]: Without dead ends: 41 [2024-11-02 11:25:41,143 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:25:41,144 INFO L432 NwaCegarLoop]: 27 mSDtfsCounter, 4 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:41,147 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 93 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:25:41,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-02 11:25:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 31. [2024-11-02 11:25:41,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 16 states have internal predecessors, (16), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-02 11:25:41,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2024-11-02 11:25:41,169 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 11 [2024-11-02 11:25:41,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:41,169 INFO L471 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2024-11-02 11:25:41,170 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-02 11:25:41,170 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2024-11-02 11:25:41,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-11-02 11:25:41,171 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:41,171 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:41,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 11:25:41,375 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:41,376 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:41,376 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:41,377 INFO L85 PathProgramCache]: Analyzing trace with hash -1026209031, now seen corresponding path program 1 times [2024-11-02 11:25:41,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:41,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188214892] [2024-11-02 11:25:41,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:41,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:41,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:41,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [842260259] [2024-11-02 11:25:41,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:41,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:41,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:41,403 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:41,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 11:25:41,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:41,460 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 11:25:41,462 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:41,526 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-02 11:25:41,527 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 11:25:41,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:41,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188214892] [2024-11-02 11:25:41,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:41,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842260259] [2024-11-02 11:25:41,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842260259] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:41,528 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:25:41,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 11:25:41,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933109150] [2024-11-02 11:25:41,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:41,529 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 11:25:41,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:41,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 11:25:41,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 11:25:41,531 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-02 11:25:41,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:41,622 INFO L93 Difference]: Finished difference Result 47 states and 65 transitions. [2024-11-02 11:25:41,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 11:25:41,623 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2024-11-02 11:25:41,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:41,624 INFO L225 Difference]: With dead ends: 47 [2024-11-02 11:25:41,624 INFO L226 Difference]: Without dead ends: 45 [2024-11-02 11:25:41,625 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:25:41,626 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 4 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:41,627 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 90 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:25:41,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2024-11-02 11:25:41,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2024-11-02 11:25:41,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2024-11-02 11:25:41,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 56 transitions. [2024-11-02 11:25:41,646 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 56 transitions. Word has length 16 [2024-11-02 11:25:41,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:41,647 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 56 transitions. [2024-11-02 11:25:41,647 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-02 11:25:41,647 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 56 transitions. [2024-11-02 11:25:41,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-02 11:25:41,648 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:41,648 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:41,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:41,852 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:41,853 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:41,853 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:41,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1104948110, now seen corresponding path program 1 times [2024-11-02 11:25:41,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:41,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663167259] [2024-11-02 11:25:41,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:41,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:41,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:41,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [558371378] [2024-11-02 11:25:41,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:41,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:41,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:41,884 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:41,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 11:25:41,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:41,950 INFO L255 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-02 11:25:41,953 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:42,051 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 11:25:42,051 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 11:25:42,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:42,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663167259] [2024-11-02 11:25:42,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:42,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558371378] [2024-11-02 11:25:42,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558371378] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:42,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:25:42,053 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 11:25:42,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573414472] [2024-11-02 11:25:42,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:42,054 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 11:25:42,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:42,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 11:25:42,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 11:25:42,055 INFO L87 Difference]: Start difference. First operand 41 states and 56 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-02 11:25:42,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:42,200 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2024-11-02 11:25:42,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 11:25:42,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2024-11-02 11:25:42,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:42,202 INFO L225 Difference]: With dead ends: 55 [2024-11-02 11:25:42,202 INFO L226 Difference]: Without dead ends: 43 [2024-11-02 11:25:42,203 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:25:42,204 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 4 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:42,206 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 82 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:25:42,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2024-11-02 11:25:42,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2024-11-02 11:25:42,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-02 11:25:42,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2024-11-02 11:25:42,240 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 21 [2024-11-02 11:25:42,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:42,241 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2024-11-02 11:25:42,241 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-02 11:25:42,241 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2024-11-02 11:25:42,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2024-11-02 11:25:42,242 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:42,242 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:42,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:42,443 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:42,443 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:42,444 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:42,444 INFO L85 PathProgramCache]: Analyzing trace with hash -700920967, now seen corresponding path program 1 times [2024-11-02 11:25:42,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:42,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68358132] [2024-11-02 11:25:42,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:42,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:42,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:42,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1970089582] [2024-11-02 11:25:42,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:42,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:42,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:42,508 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:42,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 11:25:42,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:42,583 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-02 11:25:42,586 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:42,766 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 19 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-02 11:25:42,767 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:42,996 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 13 proven. 17 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-02 11:25:42,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:42,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68358132] [2024-11-02 11:25:42,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:42,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970089582] [2024-11-02 11:25:42,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970089582] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:42,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [830466896] [2024-11-02 11:25:43,025 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2024-11-02 11:25:43,026 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:43,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:43,035 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:43,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:44,870 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:44,877 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:45,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '977#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:45,213 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:45,213 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:45,213 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2024-11-02 11:25:45,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432353175] [2024-11-02 11:25:45,213 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:45,214 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-02 11:25:45,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:45,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-02 11:25:45,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2024-11-02 11:25:45,215 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2024-11-02 11:25:45,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:45,584 INFO L93 Difference]: Finished difference Result 66 states and 86 transitions. [2024-11-02 11:25:45,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-02 11:25:45,585 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 38 [2024-11-02 11:25:45,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:45,586 INFO L225 Difference]: With dead ends: 66 [2024-11-02 11:25:45,587 INFO L226 Difference]: Without dead ends: 64 [2024-11-02 11:25:45,587 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2024-11-02 11:25:45,588 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:45,589 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 86 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-02 11:25:45,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2024-11-02 11:25:45,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 51. [2024-11-02 11:25:45,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-02 11:25:45,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 60 transitions. [2024-11-02 11:25:45,621 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 60 transitions. Word has length 38 [2024-11-02 11:25:45,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:45,622 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 60 transitions. [2024-11-02 11:25:45,622 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2024-11-02 11:25:45,623 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 60 transitions. [2024-11-02 11:25:45,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-02 11:25:45,624 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:45,624 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:45,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-02 11:25:45,826 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:45,826 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:45,827 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:45,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1757443022, now seen corresponding path program 2 times [2024-11-02 11:25:45,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:45,827 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817645795] [2024-11-02 11:25:45,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:45,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:45,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1715028254] [2024-11-02 11:25:45,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:25:45,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:45,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:45,880 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:45,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 11:25:45,938 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-02 11:25:45,939 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:25:45,940 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-02 11:25:45,942 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:46,053 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2024-11-02 11:25:46,053 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:46,174 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2024-11-02 11:25:46,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:46,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817645795] [2024-11-02 11:25:46,174 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:46,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715028254] [2024-11-02 11:25:46,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715028254] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:46,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574925367] [2024-11-02 11:25:46,177 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2024-11-02 11:25:46,177 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:46,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:46,178 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:46,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:47,372 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:47,382 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:47,671 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1444#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:47,672 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:47,672 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:47,672 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2024-11-02 11:25:47,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389124577] [2024-11-02 11:25:47,672 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:47,673 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-02 11:25:47,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:47,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-02 11:25:47,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2024-11-02 11:25:47,674 INFO L87 Difference]: Start difference. First operand 51 states and 60 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 4 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2024-11-02 11:25:47,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:47,867 INFO L93 Difference]: Finished difference Result 70 states and 89 transitions. [2024-11-02 11:25:47,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-02 11:25:47,867 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 4 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 43 [2024-11-02 11:25:47,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:47,869 INFO L225 Difference]: With dead ends: 70 [2024-11-02 11:25:47,869 INFO L226 Difference]: Without dead ends: 68 [2024-11-02 11:25:47,870 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2024-11-02 11:25:47,871 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:47,873 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 204 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:25:47,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2024-11-02 11:25:47,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2024-11-02 11:25:47,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 31 states have (on average 1.064516129032258) internal successors, (33), 33 states have internal predecessors, (33), 19 states have call successors, (19), 8 states have call predecessors, (19), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2024-11-02 11:25:47,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2024-11-02 11:25:47,903 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 43 [2024-11-02 11:25:47,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:47,903 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2024-11-02 11:25:47,904 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 4 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2024-11-02 11:25:47,904 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2024-11-02 11:25:47,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-02 11:25:47,905 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:47,906 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:47,927 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 11:25:48,110 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:48,110 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:48,114 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:48,114 INFO L85 PathProgramCache]: Analyzing trace with hash 1748922073, now seen corresponding path program 3 times [2024-11-02 11:25:48,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:48,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081301335] [2024-11-02 11:25:48,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:48,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:48,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [519815328] [2024-11-02 11:25:48,185 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:25:48,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:48,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:48,188 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:48,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 11:25:48,255 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:25:48,255 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:25:48,257 INFO L255 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-02 11:25:48,259 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:48,466 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-02 11:25:48,466 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:48,787 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-02 11:25:48,787 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:48,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081301335] [2024-11-02 11:25:48,788 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:48,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519815328] [2024-11-02 11:25:48,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519815328] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:48,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936307570] [2024-11-02 11:25:48,790 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2024-11-02 11:25:48,794 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:48,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:48,795 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:48,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:50,027 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:50,035 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:50,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1955#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:50,341 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:50,342 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:50,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2024-11-02 11:25:50,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013698567] [2024-11-02 11:25:50,342 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:50,343 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-02 11:25:50,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:50,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-02 11:25:50,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2024-11-02 11:25:50,344 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-02 11:25:50,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:50,740 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2024-11-02 11:25:50,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 11:25:50,741 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 48 [2024-11-02 11:25:50,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:50,742 INFO L225 Difference]: With dead ends: 82 [2024-11-02 11:25:50,742 INFO L226 Difference]: Without dead ends: 74 [2024-11-02 11:25:50,743 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 126 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2024-11-02 11:25:50,744 INFO L432 NwaCegarLoop]: 28 mSDtfsCounter, 6 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:50,744 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 128 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-02 11:25:50,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-02 11:25:50,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2024-11-02 11:25:50,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 40 states have (on average 1.05) internal successors, (42), 42 states have internal predecessors, (42), 16 states have call successors, (16), 11 states have call predecessors, (16), 11 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-02 11:25:50,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 73 transitions. [2024-11-02 11:25:50,769 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 73 transitions. Word has length 48 [2024-11-02 11:25:50,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:50,769 INFO L471 AbstractCegarLoop]: Abstraction has 68 states and 73 transitions. [2024-11-02 11:25:50,769 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-02 11:25:50,770 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 73 transitions. [2024-11-02 11:25:50,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-11-02 11:25:50,771 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:50,771 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:50,796 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-02 11:25:50,975 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:50,975 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:50,976 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:50,976 INFO L85 PathProgramCache]: Analyzing trace with hash -2025080784, now seen corresponding path program 1 times [2024-11-02 11:25:50,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:50,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341357079] [2024-11-02 11:25:50,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:50,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:51,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:51,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1393607111] [2024-11-02 11:25:51,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:51,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:51,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:51,030 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:51,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 11:25:51,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:51,102 INFO L255 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 27 conjuncts are in the unsatisfiable core [2024-11-02 11:25:51,104 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:51,429 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 21 proven. 38 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-02 11:25:51,429 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:53,190 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 21 proven. 38 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-02 11:25:53,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:53,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341357079] [2024-11-02 11:25:53,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:53,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393607111] [2024-11-02 11:25:53,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393607111] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:53,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770754209] [2024-11-02 11:25:53,195 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-02 11:25:53,195 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:53,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:53,195 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:53,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:54,146 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:54,152 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:54,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2601#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:54,548 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:54,548 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:54,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2024-11-02 11:25:54,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555376489] [2024-11-02 11:25:54,549 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:54,549 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-02 11:25:54,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:54,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-02 11:25:54,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2024-11-02 11:25:54,551 INFO L87 Difference]: Start difference. First operand 68 states and 73 transitions. Second operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 6 states have call predecessors, (22), 7 states have call successors, (22) [2024-11-02 11:25:55,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:55,240 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2024-11-02 11:25:55,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-02 11:25:55,240 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 6 states have call predecessors, (22), 7 states have call successors, (22) Word has length 64 [2024-11-02 11:25:55,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:55,243 INFO L225 Difference]: With dead ends: 97 [2024-11-02 11:25:55,243 INFO L226 Difference]: Without dead ends: 95 [2024-11-02 11:25:55,244 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2024-11-02 11:25:55,245 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 5 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:55,245 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 143 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-02 11:25:55,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-02 11:25:55,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2024-11-02 11:25:55,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 55 states have internal predecessors, (56), 26 states have call successors, (26), 14 states have call predecessors, (26), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2024-11-02 11:25:55,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 107 transitions. [2024-11-02 11:25:55,297 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 107 transitions. Word has length 64 [2024-11-02 11:25:55,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:55,297 INFO L471 AbstractCegarLoop]: Abstraction has 93 states and 107 transitions. [2024-11-02 11:25:55,298 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 6 states have call predecessors, (22), 7 states have call successors, (22) [2024-11-02 11:25:55,298 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 107 transitions. [2024-11-02 11:25:55,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-02 11:25:55,303 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:55,303 INFO L215 NwaCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:25:55,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:55,503 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:55,504 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:55,504 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:55,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1309118309, now seen corresponding path program 1 times [2024-11-02 11:25:55,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:55,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657146345] [2024-11-02 11:25:55,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:55,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:55,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:55,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [948999163] [2024-11-02 11:25:55,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:55,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:55,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:55,529 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:55,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-02 11:25:55,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:55,597 INFO L255 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 27 conjuncts are in the unsatisfiable core [2024-11-02 11:25:55,603 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:55,852 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-02 11:25:55,852 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:56,466 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-02 11:25:56,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:56,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657146345] [2024-11-02 11:25:56,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:56,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948999163] [2024-11-02 11:25:56,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948999163] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:56,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1454926750] [2024-11-02 11:25:56,469 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:25:56,469 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:56,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:56,470 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:56,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:57,182 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:57,186 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:57,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3342#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:57,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:57,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:57,447 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2024-11-02 11:25:57,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782668069] [2024-11-02 11:25:57,449 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:57,450 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-02 11:25:57,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:57,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-02 11:25:57,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2024-11-02 11:25:57,457 INFO L87 Difference]: Start difference. First operand 93 states and 107 transitions. Second operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2024-11-02 11:25:58,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:58,021 INFO L93 Difference]: Finished difference Result 114 states and 125 transitions. [2024-11-02 11:25:58,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-02 11:25:58,022 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) Word has length 69 [2024-11-02 11:25:58,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:58,023 INFO L225 Difference]: With dead ends: 114 [2024-11-02 11:25:58,023 INFO L226 Difference]: Without dead ends: 94 [2024-11-02 11:25:58,024 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 184 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2024-11-02 11:25:58,025 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 4 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:58,025 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 140 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-02 11:25:58,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2024-11-02 11:25:58,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2024-11-02 11:25:58,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 56 states have internal predecessors, (57), 23 states have call successors, (23), 15 states have call predecessors, (23), 15 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2024-11-02 11:25:58,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 102 transitions. [2024-11-02 11:25:58,055 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 102 transitions. Word has length 69 [2024-11-02 11:25:58,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:58,055 INFO L471 AbstractCegarLoop]: Abstraction has 94 states and 102 transitions. [2024-11-02 11:25:58,055 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2024-11-02 11:25:58,055 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 102 transitions. [2024-11-02 11:25:58,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2024-11-02 11:25:58,056 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:58,056 INFO L215 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1] [2024-11-02 11:25:58,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-02 11:25:58,260 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:58,260 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:58,261 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:58,261 INFO L85 PathProgramCache]: Analyzing trace with hash 33509209, now seen corresponding path program 4 times [2024-11-02 11:25:58,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:58,261 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119276621] [2024-11-02 11:25:58,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:58,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:58,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:25:58,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [100821495] [2024-11-02 11:25:58,285 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:25:58,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:58,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:58,288 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:58,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-02 11:25:58,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:58,354 INFO L255 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 31 conjuncts are in the unsatisfiable core [2024-11-02 11:25:58,355 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:58,543 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 23 proven. 49 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-02 11:25:58,543 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:58,780 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 23 proven. 49 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-02 11:25:58,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:58,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119276621] [2024-11-02 11:25:58,781 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:25:58,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100821495] [2024-11-02 11:25:58,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100821495] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:58,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784300996] [2024-11-02 11:25:58,787 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2024-11-02 11:25:58,792 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:58,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:58,792 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:58,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:59,542 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:25:59,550 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:59,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4115#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:25:59,805 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:59,805 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:25:59,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2024-11-02 11:25:59,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490597683] [2024-11-02 11:25:59,806 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:59,806 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-02 11:25:59,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:59,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-02 11:25:59,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2024-11-02 11:25:59,808 INFO L87 Difference]: Start difference. First operand 94 states and 102 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2024-11-02 11:26:00,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:00,137 INFO L93 Difference]: Finished difference Result 100 states and 107 transitions. [2024-11-02 11:26:00,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-02 11:26:00,138 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) Word has length 70 [2024-11-02 11:26:00,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:00,139 INFO L225 Difference]: With dead ends: 100 [2024-11-02 11:26:00,139 INFO L226 Difference]: Without dead ends: 98 [2024-11-02 11:26:00,139 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 186 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2024-11-02 11:26:00,140 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 10 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:00,140 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 11:26:00,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2024-11-02 11:26:00,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2024-11-02 11:26:00,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 59 states have internal predecessors, (60), 23 states have call successors, (23), 16 states have call predecessors, (23), 16 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2024-11-02 11:26:00,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2024-11-02 11:26:00,174 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 70 [2024-11-02 11:26:00,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:00,174 INFO L471 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2024-11-02 11:26:00,174 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 7 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2024-11-02 11:26:00,174 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2024-11-02 11:26:00,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2024-11-02 11:26:00,176 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:00,176 INFO L215 NwaCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:00,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:00,376 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:00,377 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:00,377 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:00,377 INFO L85 PathProgramCache]: Analyzing trace with hash 74939536, now seen corresponding path program 2 times [2024-11-02 11:26:00,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:00,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336422883] [2024-11-02 11:26:00,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:00,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:00,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:26:00,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870870570] [2024-11-02 11:26:00,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:26:00,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:00,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:00,427 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:00,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-02 11:26:00,506 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-02 11:26:00,506 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:00,507 INFO L255 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-02 11:26:00,510 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 107 proven. 16 refuted. 0 times theorem prover too weak. 801 trivial. 0 not checked. [2024-11-02 11:26:00,599 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:00,878 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 107 proven. 16 refuted. 0 times theorem prover too weak. 801 trivial. 0 not checked. [2024-11-02 11:26:00,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:00,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336422883] [2024-11-02 11:26:00,878 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 11:26:00,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870870570] [2024-11-02 11:26:00,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870870570] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:00,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [582034028] [2024-11-02 11:26:00,880 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-02 11:26:00,881 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:00,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:00,881 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:00,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:01,686 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-02 11:26:01,691 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:02,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5160#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-02 11:26:02,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:02,011 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 11:26:02,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2024-11-02 11:26:02,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57925269] [2024-11-02 11:26:02,012 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:02,012 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-02 11:26:02,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:02,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-02 11:26:02,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2024-11-02 11:26:02,013 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 13 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 6 states have call successors, (16) [2024-11-02 11:26:02,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:02,239 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2024-11-02 11:26:02,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 11:26:02,239 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 6 states have call successors, (16) Word has length 118 [2024-11-02 11:26:02,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:02,240 INFO L225 Difference]: With dead ends: 104 [2024-11-02 11:26:02,241 INFO L226 Difference]: Without dead ends: 100 [2024-11-02 11:26:02,241 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 330 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2024-11-02 11:26:02,242 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:02,243 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 49 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 11:26:02,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2024-11-02 11:26:02,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2024-11-02 11:26:02,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 23 states have call successors, (23), 17 states have call predecessors, (23), 16 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2024-11-02 11:26:02,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2024-11-02 11:26:02,271 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 118 [2024-11-02 11:26:02,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:02,272 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2024-11-02 11:26:02,272 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 10 states have internal predecessors, (22), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 6 states have call successors, (16) [2024-11-02 11:26:02,272 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2024-11-02 11:26:02,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2024-11-02 11:26:02,273 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:02,274 INFO L215 NwaCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:02,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-02 11:26:02,477 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-02 11:26:02,479 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:02,479 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:02,479 INFO L85 PathProgramCache]: Analyzing trace with hash -782735301, now seen corresponding path program 2 times [2024-11-02 11:26:02,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:02,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802443168] [2024-11-02 11:26:02,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:02,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:02,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 11:26:02,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1357114057] [2024-11-02 11:26:02,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:26:02,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:02,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:02,535 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:02,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b975f38-7f4a-455d-9c70-a03bf24ea779/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-02 11:26:02,640 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-02 11:26:02,641 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:02,642 INFO L255 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-02 11:26:02,649 INFO L278 TraceCheckSpWp]: Computing forward predicates...