./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_6.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_6.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:18:08,699 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:18:08,803 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:18:08,809 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:18:08,810 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:18:08,854 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:18:08,855 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:18:08,855 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:18:08,856 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:18:08,864 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:18:08,864 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:18:08,865 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:18:08,865 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:18:08,867 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:18:08,868 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:18:08,868 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:18:08,868 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:18:08,869 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:18:08,869 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:18:08,870 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:18:08,870 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:18:08,871 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:18:08,872 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:18:08,872 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:18:08,873 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:18:08,873 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:18:08,874 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:18:08,874 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:18:08,875 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:18:08,875 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:18:08,876 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:18:08,877 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:18:08,877 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:18:08,877 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:18:08,877 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:18:08,878 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:18:08,878 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:18:08,878 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:18:08,878 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:18:08,879 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:18:08,879 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:18:08,879 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:18:08,880 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:18:08,880 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:18:08,880 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:18:08,881 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:18:08,881 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:18:08,881 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_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be [2023-11-24 23:18:09,171 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:18:09,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:18:09,214 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:18:09,217 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:18:09,217 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:18:09,218 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/loop-simple/nested_6.c [2023-11-24 23:18:12,312 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:18:12,505 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:18:12,506 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/sv-benchmarks/c/loop-simple/nested_6.c [2023-11-24 23:18:12,514 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/data/f3acc16ef/2110de5ea61e480ba79823f5539047b9/FLAGd14f38bc1 [2023-11-24 23:18:12,530 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/data/f3acc16ef/2110de5ea61e480ba79823f5539047b9 [2023-11-24 23:18:12,532 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:18:12,534 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:18:12,545 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:18:12,545 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:18:12,552 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:18:12,555 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,556 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57500ae9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12, skipping insertion in model container [2023-11-24 23:18:12,557 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,583 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:18:12,727 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2023-11-24 23:18:12,731 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:18:12,742 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:18:12,757 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2023-11-24 23:18:12,758 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:18:12,773 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:18:12,773 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12 WrapperNode [2023-11-24 23:18:12,773 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:18:12,775 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:18:12,775 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:18:12,775 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:18:12,783 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,789 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,806 INFO L138 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2023-11-24 23:18:12,806 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:18:12,807 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:18:12,807 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:18:12,808 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:18:12,816 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,816 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,817 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,818 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,821 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,825 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,826 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,827 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,829 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:18:12,830 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:18:12,830 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:18:12,830 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:18:12,831 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (1/1) ... [2023-11-24 23:18:12,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:18:12,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:12,867 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:18:12,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:18:12,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:18:12,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:18:12,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:18:12,897 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:18:12,962 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:18:12,965 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:18:13,134 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:18:13,184 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:18:13,185 INFO L309 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-24 23:18:13,186 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:18:13 BoogieIcfgContainer [2023-11-24 23:18:13,187 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:18:13,190 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:18:13,190 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:18:13,194 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:18:13,194 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:18:12" (1/3) ... [2023-11-24 23:18:13,195 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bb429c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:18:13, skipping insertion in model container [2023-11-24 23:18:13,195 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:12" (2/3) ... [2023-11-24 23:18:13,196 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bb429c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:18:13, skipping insertion in model container [2023-11-24 23:18:13,196 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:18:13" (3/3) ... [2023-11-24 23:18:13,197 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_6.c [2023-11-24 23:18:13,219 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:18:13,219 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:18:13,280 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:18:13,291 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@72b31b22, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:18:13,292 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:18:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-24 23:18:13,306 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:13,307 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-24 23:18:13,308 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:13,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:13,315 INFO L85 PathProgramCache]: Analyzing trace with hash 3669673, now seen corresponding path program 1 times [2023-11-24 23:18:13,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:13,328 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730496413] [2023-11-24 23:18:13,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:13,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:13,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:13,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:13,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:13,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730496413] [2023-11-24 23:18:13,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730496413] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:13,615 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:13,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:18:13,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707766282] [2023-11-24 23:18:13,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:13,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:13,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:13,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:13,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:13,675 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:13,772 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2023-11-24 23:18:13,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:13,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-24 23:18:13,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:13,785 INFO L225 Difference]: With dead ends: 23 [2023-11-24 23:18:13,785 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:13,789 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:13,795 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 10 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:13,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 12 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:13,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:13,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 11. [2023-11-24 23:18:13,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.6) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 16 transitions. [2023-11-24 23:18:13,834 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 16 transitions. Word has length 4 [2023-11-24 23:18:13,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:13,835 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 16 transitions. [2023-11-24 23:18:13,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,835 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 16 transitions. [2023-11-24 23:18:13,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:18:13,836 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:13,836 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:18:13,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:18:13,837 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:13,838 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:13,838 INFO L85 PathProgramCache]: Analyzing trace with hash -847160113, now seen corresponding path program 1 times [2023-11-24 23:18:13,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:13,839 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445557032] [2023-11-24 23:18:13,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:13,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:13,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:13,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:13,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:13,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445557032] [2023-11-24 23:18:13,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445557032] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:13,922 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:13,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:13,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706760816] [2023-11-24 23:18:13,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:13,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:13,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:13,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:13,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:13,926 INFO L87 Difference]: Start difference. First operand 11 states and 16 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:13,958 INFO L93 Difference]: Finished difference Result 25 states and 40 transitions. [2023-11-24 23:18:13,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:13,958 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-24 23:18:13,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:13,959 INFO L225 Difference]: With dead ends: 25 [2023-11-24 23:18:13,959 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:13,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:13,962 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:13,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:13,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:13,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2023-11-24 23:18:13,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2023-11-24 23:18:13,968 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 6 [2023-11-24 23:18:13,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:13,968 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2023-11-24 23:18:13,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:13,969 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2023-11-24 23:18:13,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:18:13,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:13,969 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:13,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:18:13,970 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:13,971 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:13,971 INFO L85 PathProgramCache]: Analyzing trace with hash -426769062, now seen corresponding path program 1 times [2023-11-24 23:18:13,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:13,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590553761] [2023-11-24 23:18:13,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:13,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:13,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,026 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:14,026 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590553761] [2023-11-24 23:18:14,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590553761] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:14,027 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:14,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:14,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190092574] [2023-11-24 23:18:14,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:14,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:14,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:14,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:14,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,030 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:14,060 INFO L93 Difference]: Finished difference Result 26 states and 40 transitions. [2023-11-24 23:18:14,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:14,061 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:18:14,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:14,062 INFO L225 Difference]: With dead ends: 26 [2023-11-24 23:18:14,062 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:14,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,064 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:14,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:14,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:14,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2023-11-24 23:18:14,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2023-11-24 23:18:14,070 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 8 [2023-11-24 23:18:14,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:14,071 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2023-11-24 23:18:14,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,071 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2023-11-24 23:18:14,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:18:14,072 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:14,072 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:14,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:18:14,073 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:14,074 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:14,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1381217970, now seen corresponding path program 1 times [2023-11-24 23:18:14,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:14,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695581506] [2023-11-24 23:18:14,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:14,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:14,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:14,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695581506] [2023-11-24 23:18:14,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695581506] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:14,155 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:14,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:14,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630564533] [2023-11-24 23:18:14,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:14,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:14,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:14,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:14,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,158 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:14,188 INFO L93 Difference]: Finished difference Result 27 states and 40 transitions. [2023-11-24 23:18:14,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:14,189 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-24 23:18:14,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:14,189 INFO L225 Difference]: With dead ends: 27 [2023-11-24 23:18:14,189 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:14,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,192 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:14,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:14,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:14,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2023-11-24 23:18:14,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2023-11-24 23:18:14,198 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 10 [2023-11-24 23:18:14,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:14,198 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2023-11-24 23:18:14,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,199 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2023-11-24 23:18:14,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-24 23:18:14,199 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:14,200 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:14,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:18:14,200 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:14,201 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:14,201 INFO L85 PathProgramCache]: Analyzing trace with hash -922391157, now seen corresponding path program 1 times [2023-11-24 23:18:14,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:14,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886938401] [2023-11-24 23:18:14,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:14,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:14,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:14,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886938401] [2023-11-24 23:18:14,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886938401] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:14,266 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:14,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:14,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366693572] [2023-11-24 23:18:14,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:14,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:14,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:14,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:14,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,269 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:14,307 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2023-11-24 23:18:14,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:14,308 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-24 23:18:14,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:14,310 INFO L225 Difference]: With dead ends: 28 [2023-11-24 23:18:14,310 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:14,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,317 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:14,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:14,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:14,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-11-24 23:18:14,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2023-11-24 23:18:14,329 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 12 [2023-11-24 23:18:14,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:14,329 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2023-11-24 23:18:14,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,330 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2023-11-24 23:18:14,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:18:14,330 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:14,331 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:14,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:18:14,332 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:14,332 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:14,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1194937581, now seen corresponding path program 1 times [2023-11-24 23:18:14,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:14,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685418294] [2023-11-24 23:18:14,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:14,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:14,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:14,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685418294] [2023-11-24 23:18:14,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685418294] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:14,420 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:14,420 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:14,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170348499] [2023-11-24 23:18:14,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:14,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:14,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:14,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:14,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,422 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:14,444 INFO L93 Difference]: Finished difference Result 29 states and 40 transitions. [2023-11-24 23:18:14,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:14,445 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-24 23:18:14,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:14,445 INFO L225 Difference]: With dead ends: 29 [2023-11-24 23:18:14,445 INFO L226 Difference]: Without dead ends: 16 [2023-11-24 23:18:14,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:14,447 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:14,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:14,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-24 23:18:14,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-24 23:18:14,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2023-11-24 23:18:14,453 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 14 [2023-11-24 23:18:14,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:14,453 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2023-11-24 23:18:14,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:14,454 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2023-11-24 23:18:14,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-24 23:18:14,454 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:14,455 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:14,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 23:18:14,455 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:14,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:14,456 INFO L85 PathProgramCache]: Analyzing trace with hash 646159466, now seen corresponding path program 1 times [2023-11-24 23:18:14,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:14,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308205808] [2023-11-24 23:18:14,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:14,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:14,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:14,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308205808] [2023-11-24 23:18:14,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308205808] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:14,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650093306] [2023-11-24 23:18:14,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:14,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:14,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:14,512 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:14,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:18:14,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:14,600 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-24 23:18:14,606 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:14,658 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,658 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:14,699 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:14,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650093306] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:14,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583681881] [2023-11-24 23:18:14,728 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-24 23:18:14,728 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:14,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:14,738 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:14,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:16,502 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:16,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '532#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))))' at error location [2023-11-24 23:18:16,888 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:16,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:18:16,888 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-24 23:18:16,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881251682] [2023-11-24 23:18:16,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:16,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:18:16,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:16,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:18:16,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:18:16,891 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:16,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:16,927 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2023-11-24 23:18:16,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:18:16,928 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-24 23:18:16,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:16,929 INFO L225 Difference]: With dead ends: 33 [2023-11-24 23:18:16,929 INFO L226 Difference]: Without dead ends: 19 [2023-11-24 23:18:16,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:18:16,931 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:16,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:16,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-24 23:18:16,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-24 23:18:16,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:16,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2023-11-24 23:18:16,942 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 15 [2023-11-24 23:18:16,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:16,942 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2023-11-24 23:18:16,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:16,943 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2023-11-24 23:18:16,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-24 23:18:16,944 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:16,944 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:16,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:17,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:18:17,151 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:17,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:17,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1251880749, now seen corresponding path program 2 times [2023-11-24 23:18:17,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:17,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683446198] [2023-11-24 23:18:17,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:17,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:17,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:17,253 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-24 23:18:17,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:17,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683446198] [2023-11-24 23:18:17,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683446198] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:17,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183909103] [2023-11-24 23:18:17,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:18:17,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:17,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:17,256 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:17,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:18:17,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-24 23:18:17,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:18:17,319 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-24 23:18:17,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:18:17,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:17,404 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:18:17,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183909103] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:17,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103221047] [2023-11-24 23:18:17,410 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-24 23:18:17,411 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:17,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:17,412 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:17,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:18,596 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:19,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '743#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))))' at error location [2023-11-24 23:18:19,002 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:19,002 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:18:19,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2023-11-24 23:18:19,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301140589] [2023-11-24 23:18:19,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:19,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:18:19,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:19,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:18:19,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:18:19,012 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:19,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:19,259 INFO L93 Difference]: Finished difference Result 122 states and 162 transitions. [2023-11-24 23:18:19,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-24 23:18:19,261 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-24 23:18:19,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:19,267 INFO L225 Difference]: With dead ends: 122 [2023-11-24 23:18:19,274 INFO L226 Difference]: Without dead ends: 105 [2023-11-24 23:18:19,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=430, Unknown=0, NotChecked=0, Total=552 [2023-11-24 23:18:19,277 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 40 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:19,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 18 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:19,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-24 23:18:19,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 85. [2023-11-24 23:18:19,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 84 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:19,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 109 transitions. [2023-11-24 23:18:19,309 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 109 transitions. Word has length 18 [2023-11-24 23:18:19,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:19,310 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 109 transitions. [2023-11-24 23:18:19,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:19,310 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 109 transitions. [2023-11-24 23:18:19,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2023-11-24 23:18:19,316 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:19,317 INFO L195 NwaCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-24 23:18:19,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:19,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:18:19,523 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:19,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:19,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1454075505, now seen corresponding path program 3 times [2023-11-24 23:18:19,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:19,526 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380171900] [2023-11-24 23:18:19,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:19,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:19,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:19,685 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 357 proven. 1 refuted. 0 times theorem prover too weak. 582 trivial. 0 not checked. [2023-11-24 23:18:19,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:19,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380171900] [2023-11-24 23:18:19,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380171900] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:19,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763821249] [2023-11-24 23:18:19,688 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:18:19,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:19,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:19,691 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:19,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:18:19,784 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:18:19,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:18:19,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-24 23:18:19,790 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:19,838 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 211 proven. 10 refuted. 0 times theorem prover too weak. 719 trivial. 0 not checked. [2023-11-24 23:18:19,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:19,896 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 211 proven. 10 refuted. 0 times theorem prover too weak. 719 trivial. 0 not checked. [2023-11-24 23:18:19,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763821249] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:19,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119590964] [2023-11-24 23:18:19,899 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-24 23:18:19,900 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:19,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:19,901 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:19,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:21,080 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:21,500 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1678#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))))' at error location [2023-11-24 23:18:21,500 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:21,500 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:18:21,500 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2023-11-24 23:18:21,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464179923] [2023-11-24 23:18:21,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:21,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-24 23:18:21,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:21,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-24 23:18:21,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:18:21,503 INFO L87 Difference]: Start difference. First operand 85 states and 109 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:21,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:21,775 INFO L93 Difference]: Finished difference Result 323 states and 447 transitions. [2023-11-24 23:18:21,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:18:21,776 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2023-11-24 23:18:21,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:21,786 INFO L225 Difference]: With dead ends: 323 [2023-11-24 23:18:21,786 INFO L226 Difference]: Without dead ends: 241 [2023-11-24 23:18:21,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 234 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:18:21,789 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 10 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:21,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 27 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:21,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2023-11-24 23:18:21,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 173. [2023-11-24 23:18:21,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 172 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:21,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 209 transitions. [2023-11-24 23:18:21,855 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 209 transitions. Word has length 84 [2023-11-24 23:18:21,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:21,855 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 209 transitions. [2023-11-24 23:18:21,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:21,856 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 209 transitions. [2023-11-24 23:18:21,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2023-11-24 23:18:21,870 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:21,871 INFO L195 NwaCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-24 23:18:21,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:22,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:22,077 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:22,078 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:22,078 INFO L85 PathProgramCache]: Analyzing trace with hash 831565861, now seen corresponding path program 4 times [2023-11-24 23:18:22,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:22,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794793677] [2023-11-24 23:18:22,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:22,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:22,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:22,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 2510 proven. 1 refuted. 0 times theorem prover too weak. 4113 trivial. 0 not checked. [2023-11-24 23:18:22,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:22,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794793677] [2023-11-24 23:18:22,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794793677] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:22,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307465421] [2023-11-24 23:18:22,327 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-24 23:18:22,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:22,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:22,328 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:22,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:18:22,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:22,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:18:22,537 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:22,607 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 1464 proven. 52 refuted. 0 times theorem prover too weak. 5108 trivial. 0 not checked. [2023-11-24 23:18:22,607 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:22,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 1464 proven. 52 refuted. 0 times theorem prover too weak. 5108 trivial. 0 not checked. [2023-11-24 23:18:22,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307465421] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:22,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1877472075] [2023-11-24 23:18:22,692 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-24 23:18:22,692 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:22,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:22,693 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:22,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:23,807 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:24,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3727#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))))' at error location [2023-11-24 23:18:24,160 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:24,160 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:18:24,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2023-11-24 23:18:24,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141906044] [2023-11-24 23:18:24,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:24,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-24 23:18:24,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:24,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-24 23:18:24,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:18:24,163 INFO L87 Difference]: Start difference. First operand 173 states and 209 transitions. Second operand has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:24,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:24,648 INFO L93 Difference]: Finished difference Result 1411 states and 1735 transitions. [2023-11-24 23:18:24,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:18:24,649 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2023-11-24 23:18:24,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:24,657 INFO L225 Difference]: With dead ends: 1411 [2023-11-24 23:18:24,657 INFO L226 Difference]: Without dead ends: 1241 [2023-11-24 23:18:24,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:18:24,661 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 34 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:24,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 15 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:24,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2023-11-24 23:18:24,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 837. [2023-11-24 23:18:24,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 836 states have (on average 1.1543062200956937) internal successors, (965), 836 states have internal predecessors, (965), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:24,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 965 transitions. [2023-11-24 23:18:24,860 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 965 transitions. Word has length 172 [2023-11-24 23:18:24,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:24,863 INFO L495 AbstractCegarLoop]: Abstraction has 837 states and 965 transitions. [2023-11-24 23:18:24,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:24,863 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 965 transitions. [2023-11-24 23:18:24,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 837 [2023-11-24 23:18:24,898 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:24,899 INFO L195 NwaCegarLoop]: trace histogram [576, 96, 96, 16, 16, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-24 23:18:24,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:25,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:25,106 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:25,106 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:25,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1184511011, now seen corresponding path program 5 times [2023-11-24 23:18:25,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:25,107 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041908891] [2023-11-24 23:18:25,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:25,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:25,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:26,390 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 87175 proven. 1 refuted. 0 times theorem prover too weak. 144876 trivial. 0 not checked. [2023-11-24 23:18:26,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:26,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041908891] [2023-11-24 23:18:26,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041908891] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:26,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311435048] [2023-11-24 23:18:26,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:18:26,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:26,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:26,393 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:26,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:18:26,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 105 check-sat command(s) [2023-11-24 23:18:26,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:18:26,979 INFO L262 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:18:27,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:27,264 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 50849 proven. 1816 refuted. 0 times theorem prover too weak. 179387 trivial. 0 not checked. [2023-11-24 23:18:27,264 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:27,507 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 50849 proven. 1816 refuted. 0 times theorem prover too weak. 179387 trivial. 0 not checked. [2023-11-24 23:18:27,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311435048] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:27,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453792932] [2023-11-24 23:18:27,511 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-24 23:18:27,511 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:27,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:27,512 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:27,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:28,470 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:28,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13264#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))))' at error location [2023-11-24 23:18:28,866 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:28,866 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:18:28,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2023-11-24 23:18:28,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077504262] [2023-11-24 23:18:28,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:28,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-24 23:18:28,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:28,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-24 23:18:28,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:18:28,873 INFO L87 Difference]: Start difference. First operand 837 states and 965 transitions. Second operand has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:30,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:30,468 INFO L93 Difference]: Finished difference Result 8115 states and 9391 transitions. [2023-11-24 23:18:30,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:18:30,469 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 836 [2023-11-24 23:18:30,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:30,520 INFO L225 Difference]: With dead ends: 8115 [2023-11-24 23:18:30,520 INFO L226 Difference]: Without dead ends: 7281 [2023-11-24 23:18:30,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2522 GetRequests, 2494 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=668, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:18:30,526 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 58 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:30,527 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 21 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:30,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7281 states. [2023-11-24 23:18:31,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7281 to 4861. [2023-11-24 23:18:31,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4861 states, 4860 states have (on average 1.144238683127572) internal successors, (5561), 4860 states have internal predecessors, (5561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:31,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4861 states to 4861 states and 5561 transitions. [2023-11-24 23:18:31,657 INFO L78 Accepts]: Start accepts. Automaton has 4861 states and 5561 transitions. Word has length 836 [2023-11-24 23:18:31,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:31,662 INFO L495 AbstractCegarLoop]: Abstraction has 4861 states and 5561 transitions. [2023-11-24 23:18:31,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:18:31,663 INFO L276 IsEmpty]: Start isEmpty. Operand 4861 states and 5561 transitions. [2023-11-24 23:18:32,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4861 [2023-11-24 23:18:32,050 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:32,053 INFO L195 NwaCegarLoop]: trace histogram [3456, 576, 576, 96, 96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2023-11-24 23:18:32,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:32,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-24 23:18:32,254 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:18:32,255 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:32,256 INFO L85 PathProgramCache]: Analyzing trace with hash 96753849, now seen corresponding path program 6 times [2023-11-24 23:18:32,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:32,256 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923634549] [2023-11-24 23:18:32,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:32,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:36,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:49,940 INFO L134 CoverageAnalysis]: Checked inductivity of 8358520 backedges. 1828954 proven. 65320 refuted. 0 times theorem prover too weak. 6464246 trivial. 0 not checked. [2023-11-24 23:18:49,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:49,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923634549] [2023-11-24 23:18:49,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923634549] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:49,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549743641] [2023-11-24 23:18:49,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:18:49,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:49,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:49,943 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:49,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f8a4d21-dda7-41ff-91ed-fa15afdc7c83/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:18:53,083 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:18:53,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:18:53,166 INFO L262 TraceCheckSpWp]: Trace formula consists of 14573 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:18:53,249 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:54,670 INFO L134 CoverageAnalysis]: Checked inductivity of 8358520 backedges. 1828954 proven. 65320 refuted. 0 times theorem prover too weak. 6464246 trivial. 0 not checked. [2023-11-24 23:18:54,670 INFO L327 TraceCheckSpWp]: Computing backward predicates...