./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 826ab2ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E --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 8d05359bf1cd6e974dc237604ab15e53b702ce490bf8880eb5ddff78fcd04ff1 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 02:49:21,803 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 02:49:21,879 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 02:49:21,884 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 02:49:21,885 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 02:49:21,918 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 02:49:21,919 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 02:49:21,919 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 02:49:21,919 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 02:49:21,919 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 02:49:21,920 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 02:49:21,920 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 02:49:21,922 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 02:49:21,923 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 02:49:21,923 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 02:49:21,923 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 02:49:21,924 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 02:49:21,924 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 02:49:21,924 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 02:49:21,924 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 02:49:21,924 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 02:49:21,925 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 02:49:21,926 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 02:49:21,926 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 02:49:21,926 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 02:49:21,927 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 02:49:21,927 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 02:49:21,927 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 02:49:21,927 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E 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 -> 8d05359bf1cd6e974dc237604ab15e53b702ce490bf8880eb5ddff78fcd04ff1 [2024-11-14 02:49:22,256 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 02:49:22,267 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 02:49:22,274 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 02:49:22,275 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 02:49:22,277 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 02:49:22,278 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/array-crafted/zero_sum1.c Unable to find full path for "g++" [2024-11-14 02:49:24,332 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 02:49:24,623 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 02:49:24,624 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/sv-benchmarks/c/array-crafted/zero_sum1.c [2024-11-14 02:49:24,635 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/data/a0f1de881/68a20497dd434b90a1ac5c6720b404e5/FLAGb2175ece0 [2024-11-14 02:49:24,653 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/data/a0f1de881/68a20497dd434b90a1ac5c6720b404e5 [2024-11-14 02:49:24,656 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 02:49:24,658 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 02:49:24,660 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 02:49:24,660 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 02:49:24,666 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 02:49:24,667 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:24,668 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3304f2d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24, skipping insertion in model container [2024-11-14 02:49:24,669 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:24,687 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 02:49:24,887 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/sv-benchmarks/c/array-crafted/zero_sum1.c[400,413] [2024-11-14 02:49:24,908 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 02:49:24,917 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 02:49:24,931 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/sv-benchmarks/c/array-crafted/zero_sum1.c[400,413] [2024-11-14 02:49:24,941 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 02:49:24,958 INFO L204 MainTranslator]: Completed translation [2024-11-14 02:49:24,959 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24 WrapperNode [2024-11-14 02:49:24,959 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 02:49:24,961 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 02:49:24,961 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 02:49:24,961 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 02:49:24,973 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:24,983 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,006 INFO L138 Inliner]: procedures = 15, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 61 [2024-11-14 02:49:25,007 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 02:49:25,007 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 02:49:25,007 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 02:49:25,007 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 02:49:25,019 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,019 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,020 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,022 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,029 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,037 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,038 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,039 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,040 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 02:49:25,045 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 02:49:25,045 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 02:49:25,046 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 02:49:25,047 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (1/1) ... [2024-11-14 02:49:25,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 02:49:25,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:25,098 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 02:49:25,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 02:49:25,138 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 02:49:25,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 02:49:25,138 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-14 02:49:25,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-14 02:49:25,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 02:49:25,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 02:49:25,139 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-14 02:49:25,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-14 02:49:25,229 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 02:49:25,232 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 02:49:25,387 INFO L? ?]: Removed 9 outVars from TransFormulas that were not future-live. [2024-11-14 02:49:25,387 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 02:49:25,423 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 02:49:25,423 INFO L316 CfgBuilder]: Removed 3 assume(true) statements. [2024-11-14 02:49:25,424 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 02:49:25 BoogieIcfgContainer [2024-11-14 02:49:25,424 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 02:49:25,427 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 02:49:25,427 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 02:49:25,433 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 02:49:25,433 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 02:49:24" (1/3) ... [2024-11-14 02:49:25,434 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c3eb4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 02:49:25, skipping insertion in model container [2024-11-14 02:49:25,434 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 02:49:24" (2/3) ... [2024-11-14 02:49:25,435 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c3eb4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 02:49:25, skipping insertion in model container [2024-11-14 02:49:25,435 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 02:49:25" (3/3) ... [2024-11-14 02:49:25,436 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum1.c [2024-11-14 02:49:25,455 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 02:49:25,457 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG zero_sum1.c that has 1 procedures, 11 locations, 1 initial locations, 3 loop locations, and 1 error locations. [2024-11-14 02:49:25,522 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 02:49:25,542 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3d2e4b4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 02:49:25,543 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 02:49:25,549 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 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) [2024-11-14 02:49:25,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-14 02:49:25,558 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:25,559 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:25,560 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:25,565 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:25,566 INFO L85 PathProgramCache]: Analyzing trace with hash -636311083, now seen corresponding path program 1 times [2024-11-14 02:49:25,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:25,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661682413] [2024-11-14 02:49:25,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:25,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:25,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:25,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:25,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:25,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661682413] [2024-11-14 02:49:25,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661682413] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 02:49:25,883 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 02:49:25,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-14 02:49:25,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064398526] [2024-11-14 02:49:25,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 02:49:25,895 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-14 02:49:25,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:25,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-14 02:49:25,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 02:49:25,926 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 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 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2024-11-14 02:49:25,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:26,000 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2024-11-14 02:49:26,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-14 02:49:26,007 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 7 [2024-11-14 02:49:26,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:26,014 INFO L225 Difference]: With dead ends: 20 [2024-11-14 02:49:26,015 INFO L226 Difference]: Without dead ends: 9 [2024-11-14 02:49:26,021 INFO L431 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 [2024-11-14 02:49:26,024 INFO L432 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:26,025 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:26,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2024-11-14 02:49:26,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2024-11-14 02:49:26,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 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) [2024-11-14 02:49:26,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2024-11-14 02:49:26,067 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2024-11-14 02:49:26,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:26,068 INFO L471 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2024-11-14 02:49:26,070 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2024-11-14 02:49:26,070 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2024-11-14 02:49:26,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-14 02:49:26,071 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:26,071 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:26,071 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 02:49:26,072 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:26,072 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:26,072 INFO L85 PathProgramCache]: Analyzing trace with hash 258767420, now seen corresponding path program 1 times [2024-11-14 02:49:26,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:26,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621391904] [2024-11-14 02:49:26,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:26,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:26,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:26,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-14 02:49:26,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:26,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621391904] [2024-11-14 02:49:26,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621391904] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 02:49:26,284 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 02:49:26,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-14 02:49:26,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424658900] [2024-11-14 02:49:26,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 02:49:26,286 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-14 02:49:26,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:26,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-14 02:49:26,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-14 02:49:26,287 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 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) [2024-11-14 02:49:26,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:26,331 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2024-11-14 02:49:26,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 02:49:26,332 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 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 [2024-11-14 02:49:26,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:26,333 INFO L225 Difference]: With dead ends: 15 [2024-11-14 02:49:26,333 INFO L226 Difference]: Without dead ends: 11 [2024-11-14 02:49:26,333 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-14 02:49:26,334 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:26,335 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 02:49:26,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2024-11-14 02:49:26,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2024-11-14 02:49:26,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 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) [2024-11-14 02:49:26,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2024-11-14 02:49:26,340 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2024-11-14 02:49:26,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:26,341 INFO L471 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2024-11-14 02:49:26,341 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 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) [2024-11-14 02:49:26,341 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2024-11-14 02:49:26,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-14 02:49:26,342 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:26,342 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:26,342 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 02:49:26,342 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:26,343 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:26,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1631533596, now seen corresponding path program 1 times [2024-11-14 02:49:26,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:26,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178544537] [2024-11-14 02:49:26,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:26,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:26,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:26,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-14 02:49:26,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:26,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178544537] [2024-11-14 02:49:26,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178544537] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:26,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358370512] [2024-11-14 02:49:26,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:26,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:26,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:26,546 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:26,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 02:49:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:26,656 INFO L255 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 02:49:26,661 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:26,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-14 02:49:26,741 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:26,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-14 02:49:26,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358370512] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:26,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109694645] [2024-11-14 02:49:26,800 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:26,800 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:26,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:26,809 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:26,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:27,726 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:27,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '162#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:27,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:27,920 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:27,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2024-11-14 02:49:27,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012088563] [2024-11-14 02:49:27,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:27,925 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 02:49:27,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:27,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 02:49:27,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2024-11-14 02:49:27,927 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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) [2024-11-14 02:49:27,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:27,997 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2024-11-14 02:49:27,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 02:49:27,999 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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 [2024-11-14 02:49:27,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:28,000 INFO L225 Difference]: With dead ends: 19 [2024-11-14 02:49:28,000 INFO L226 Difference]: Without dead ends: 12 [2024-11-14 02:49:28,001 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2024-11-14 02:49:28,004 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:28,004 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:28,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2024-11-14 02:49:28,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2024-11-14 02:49:28,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 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) [2024-11-14 02:49:28,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2024-11-14 02:49:28,009 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 10 [2024-11-14 02:49:28,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:28,012 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2024-11-14 02:49:28,012 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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) [2024-11-14 02:49:28,013 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2024-11-14 02:49:28,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-14 02:49:28,013 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:28,013 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:28,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-14 02:49:28,218 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:28,218 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:28,219 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:28,219 INFO L85 PathProgramCache]: Analyzing trace with hash 495175709, now seen corresponding path program 2 times [2024-11-14 02:49:28,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:28,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470569465] [2024-11-14 02:49:28,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:28,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:28,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:28,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 02:49:28,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:28,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470569465] [2024-11-14 02:49:28,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470569465] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:28,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528446863] [2024-11-14 02:49:28,371 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:49:28,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:28,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:28,376 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:28,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 02:49:28,475 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-14 02:49:28,475 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:28,476 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 02:49:28,477 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:28,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 02:49:28,534 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:28,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 02:49:28,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528446863] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:28,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220281177] [2024-11-14 02:49:28,576 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:28,576 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:28,577 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:28,577 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:28,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:29,018 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:29,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '284#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:29,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:29,180 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:29,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2024-11-14 02:49:29,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214465780] [2024-11-14 02:49:29,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:29,181 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-14 02:49:29,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:29,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-14 02:49:29,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2024-11-14 02:49:29,182 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 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) [2024-11-14 02:49:29,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:29,232 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2024-11-14 02:49:29,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 02:49:29,233 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 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 11 [2024-11-14 02:49:29,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:29,233 INFO L225 Difference]: With dead ends: 19 [2024-11-14 02:49:29,235 INFO L226 Difference]: Without dead ends: 14 [2024-11-14 02:49:29,235 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2024-11-14 02:49:29,236 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:29,237 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 02:49:29,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2024-11-14 02:49:29,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2024-11-14 02:49:29,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2024-11-14 02:49:29,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2024-11-14 02:49:29,243 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2024-11-14 02:49:29,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:29,243 INFO L471 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2024-11-14 02:49:29,244 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 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) [2024-11-14 02:49:29,244 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2024-11-14 02:49:29,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2024-11-14 02:49:29,244 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:29,244 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:29,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-14 02:49:29,445 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:29,445 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:29,446 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:29,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1336709749, now seen corresponding path program 3 times [2024-11-14 02:49:29,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:29,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74912782] [2024-11-14 02:49:29,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:29,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:29,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:30,483 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:30,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:30,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74912782] [2024-11-14 02:49:30,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74912782] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:30,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490914067] [2024-11-14 02:49:30,483 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:49:30,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:30,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:30,485 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:30,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 02:49:30,562 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:49:30,563 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:30,564 INFO L255 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 02:49:30,567 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:30,615 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:49:30,693 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:30,693 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:30,895 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 02:49:30,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490914067] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:30,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768106811] [2024-11-14 02:49:30,899 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:30,900 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:30,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:30,901 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:30,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:31,291 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:31,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '342#true' at error location [2024-11-14 02:49:31,529 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:31,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:31,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2024-11-14 02:49:31,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793868419] [2024-11-14 02:49:31,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:31,530 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-14 02:49:31,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:31,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-14 02:49:31,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2024-11-14 02:49:31,532 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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) [2024-11-14 02:49:31,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:31,694 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2024-11-14 02:49:31,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 02:49:31,695 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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 13 [2024-11-14 02:49:31,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:31,695 INFO L225 Difference]: With dead ends: 21 [2024-11-14 02:49:31,695 INFO L226 Difference]: Without dead ends: 18 [2024-11-14 02:49:31,696 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2024-11-14 02:49:31,697 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:31,697 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 23 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:31,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2024-11-14 02:49:31,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2024-11-14 02:49:31,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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) [2024-11-14 02:49:31,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2024-11-14 02:49:31,702 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2024-11-14 02:49:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:31,702 INFO L471 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2024-11-14 02:49:31,702 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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) [2024-11-14 02:49:31,702 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2024-11-14 02:49:31,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2024-11-14 02:49:31,703 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:31,703 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:31,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-14 02:49:31,907 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:31,907 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:31,908 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:31,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1512427064, now seen corresponding path program 4 times [2024-11-14 02:49:31,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:31,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403167131] [2024-11-14 02:49:31,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:31,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:31,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:32,089 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 02:49:32,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:32,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403167131] [2024-11-14 02:49:32,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403167131] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:32,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762297967] [2024-11-14 02:49:32,090 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:49:32,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:32,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:32,093 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:32,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 02:49:32,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:32,170 INFO L255 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 02:49:32,171 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 02:49:32,277 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:32,360 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 02:49:32,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762297967] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:32,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [917090662] [2024-11-14 02:49:32,364 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:32,364 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:32,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:32,364 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:32,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:32,672 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:32,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '589#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:32,847 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:32,847 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:32,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-14 02:49:32,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426471093] [2024-11-14 02:49:32,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:32,848 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 02:49:32,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:32,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 02:49:32,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2024-11-14 02:49:32,849 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) [2024-11-14 02:49:32,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:32,929 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2024-11-14 02:49:32,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-14 02:49:32,929 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) Word has length 14 [2024-11-14 02:49:32,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:32,930 INFO L225 Difference]: With dead ends: 30 [2024-11-14 02:49:32,930 INFO L226 Difference]: Without dead ends: 17 [2024-11-14 02:49:32,931 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2024-11-14 02:49:32,932 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:32,932 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:32,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2024-11-14 02:49:32,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2024-11-14 02:49:32,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 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) [2024-11-14 02:49:32,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2024-11-14 02:49:32,938 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2024-11-14 02:49:32,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:32,938 INFO L471 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2024-11-14 02:49:32,939 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) [2024-11-14 02:49:32,939 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2024-11-14 02:49:32,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-14 02:49:32,939 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:32,940 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:32,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-14 02:49:33,144 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:33,144 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:33,145 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:33,145 INFO L85 PathProgramCache]: Analyzing trace with hash 711946113, now seen corresponding path program 5 times [2024-11-14 02:49:33,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:33,145 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78229245] [2024-11-14 02:49:33,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:33,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:33,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:33,296 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:33,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:33,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78229245] [2024-11-14 02:49:33,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78229245] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:33,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155973470] [2024-11-14 02:49:33,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:49:33,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:33,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:33,300 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:33,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 02:49:33,375 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 02:49:33,375 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:33,376 INFO L255 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 02:49:33,377 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:33,459 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:33,460 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:33,534 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:33,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155973470] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:33,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154670091] [2024-11-14 02:49:33,536 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:33,536 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:33,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:33,537 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:33,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:33,784 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:33,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '773#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:33,922 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:33,922 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:33,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-14 02:49:33,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068791302] [2024-11-14 02:49:33,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:33,923 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 02:49:33,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:33,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 02:49:33,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2024-11-14 02:49:33,924 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) [2024-11-14 02:49:34,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:34,008 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2024-11-14 02:49:34,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 02:49:34,008 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) Word has length 15 [2024-11-14 02:49:34,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:34,009 INFO L225 Difference]: With dead ends: 24 [2024-11-14 02:49:34,009 INFO L226 Difference]: Without dead ends: 17 [2024-11-14 02:49:34,009 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2024-11-14 02:49:34,010 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:34,010 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 17 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:34,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2024-11-14 02:49:34,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2024-11-14 02:49:34,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 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) [2024-11-14 02:49:34,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2024-11-14 02:49:34,015 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2024-11-14 02:49:34,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:34,016 INFO L471 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2024-11-14 02:49:34,016 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 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) [2024-11-14 02:49:34,016 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2024-11-14 02:49:34,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-11-14 02:49:34,018 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:34,018 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:34,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-14 02:49:34,219 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:34,219 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:34,219 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:34,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1266453316, now seen corresponding path program 6 times [2024-11-14 02:49:34,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:34,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775979200] [2024-11-14 02:49:34,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:34,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:35,174 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:35,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:35,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775979200] [2024-11-14 02:49:35,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775979200] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:35,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275621323] [2024-11-14 02:49:35,175 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:49:35,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:35,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:35,177 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:35,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 02:49:35,250 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:49:35,250 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:35,256 INFO L255 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-14 02:49:35,258 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:35,292 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:49:35,592 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:35,592 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:35,967 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:35,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275621323] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:35,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [506534801] [2024-11-14 02:49:35,970 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:35,971 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:35,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:35,972 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:35,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:36,197 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:36,437 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '969#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:36,437 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:36,437 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:36,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 11] total 30 [2024-11-14 02:49:36,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932926730] [2024-11-14 02:49:36,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:36,438 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2024-11-14 02:49:36,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:36,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2024-11-14 02:49:36,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 02:49:36,440 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 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) [2024-11-14 02:49:36,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:36,853 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2024-11-14 02:49:36,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 02:49:36,853 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 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 16 [2024-11-14 02:49:36,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:36,854 INFO L225 Difference]: With dead ends: 25 [2024-11-14 02:49:36,854 INFO L226 Difference]: Without dead ends: 22 [2024-11-14 02:49:36,855 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=1316, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 02:49:36,855 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:36,856 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 43 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 02:49:36,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2024-11-14 02:49:36,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2024-11-14 02:49:36,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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) [2024-11-14 02:49:36,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2024-11-14 02:49:36,861 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 16 [2024-11-14 02:49:36,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:36,861 INFO L471 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2024-11-14 02:49:36,861 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 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) [2024-11-14 02:49:36,862 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2024-11-14 02:49:36,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-11-14 02:49:36,862 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:36,862 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:36,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-14 02:49:37,062 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:37,063 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:37,063 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:37,063 INFO L85 PathProgramCache]: Analyzing trace with hash 604590809, now seen corresponding path program 7 times [2024-11-14 02:49:37,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:37,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015693662] [2024-11-14 02:49:37,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:37,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:37,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:37,225 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:37,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:37,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015693662] [2024-11-14 02:49:37,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015693662] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:37,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122120654] [2024-11-14 02:49:37,225 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:49:37,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:37,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:37,228 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:37,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 02:49:37,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:37,298 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-14 02:49:37,299 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:37,405 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:37,407 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:37,486 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 02:49:37,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122120654] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:37,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [853247227] [2024-11-14 02:49:37,488 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:37,488 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:37,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:37,488 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:37,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:37,694 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:37,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1057#true' at error location [2024-11-14 02:49:37,826 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:37,826 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:37,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-14 02:49:37,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653084218] [2024-11-14 02:49:37,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:37,827 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-14 02:49:37,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:37,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-14 02:49:37,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-14 02:49:37,828 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) [2024-11-14 02:49:37,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:37,906 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2024-11-14 02:49:37,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 02:49:37,907 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) Word has length 17 [2024-11-14 02:49:37,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:37,907 INFO L225 Difference]: With dead ends: 36 [2024-11-14 02:49:37,907 INFO L226 Difference]: Without dead ends: 20 [2024-11-14 02:49:37,908 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-14 02:49:37,908 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:37,908 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:37,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-14 02:49:37,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2024-11-14 02:49:37,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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) [2024-11-14 02:49:37,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2024-11-14 02:49:37,913 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2024-11-14 02:49:37,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:37,913 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2024-11-14 02:49:37,913 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) [2024-11-14 02:49:37,914 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2024-11-14 02:49:37,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-14 02:49:37,914 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:37,914 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:37,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-14 02:49:38,118 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:38,118 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:38,118 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:38,118 INFO L85 PathProgramCache]: Analyzing trace with hash -144503168, now seen corresponding path program 8 times [2024-11-14 02:49:38,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:38,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225516060] [2024-11-14 02:49:38,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:38,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:38,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:38,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:38,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225516060] [2024-11-14 02:49:38,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225516060] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:38,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066932476] [2024-11-14 02:49:38,279 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:49:38,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:38,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:38,282 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:38,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 02:49:38,358 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 02:49:38,358 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:38,359 INFO L255 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-14 02:49:38,360 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:38,450 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:38,543 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:38,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066932476] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:38,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157387033] [2024-11-14 02:49:38,545 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:38,545 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:38,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:38,545 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:38,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:38,758 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:38,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1273#true' at error location [2024-11-14 02:49:38,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:38,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:38,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-14 02:49:38,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287237290] [2024-11-14 02:49:38,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:38,880 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-14 02:49:38,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:38,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-14 02:49:38,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-14 02:49:38,881 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) [2024-11-14 02:49:38,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:38,970 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2024-11-14 02:49:38,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 02:49:38,971 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) Word has length 18 [2024-11-14 02:49:38,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:38,971 INFO L225 Difference]: With dead ends: 28 [2024-11-14 02:49:38,971 INFO L226 Difference]: Without dead ends: 20 [2024-11-14 02:49:38,972 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 36 SyntacticMatches, 8 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2024-11-14 02:49:38,972 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:38,972 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 11 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:38,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-14 02:49:38,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2024-11-14 02:49:38,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 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) [2024-11-14 02:49:38,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2024-11-14 02:49:38,979 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2024-11-14 02:49:38,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:38,979 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2024-11-14 02:49:38,982 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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) [2024-11-14 02:49:38,983 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2024-11-14 02:49:38,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-14 02:49:38,983 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:38,983 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:39,002 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-14 02:49:39,183 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-14 02:49:39,184 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:39,184 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:39,184 INFO L85 PathProgramCache]: Analyzing trace with hash -837008619, now seen corresponding path program 9 times [2024-11-14 02:49:39,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:39,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266424104] [2024-11-14 02:49:39,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:39,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:39,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:40,304 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:40,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:40,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266424104] [2024-11-14 02:49:40,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266424104] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:40,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809212839] [2024-11-14 02:49:40,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:49:40,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:40,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:40,307 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:40,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 02:49:40,379 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:49:40,379 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:40,381 INFO L255 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-14 02:49:40,384 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:40,421 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:49:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:40,859 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:41,317 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:41,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809212839] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:41,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [727463629] [2024-11-14 02:49:41,319 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:41,319 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:41,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:41,319 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:41,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:41,522 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:41,753 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1626#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:41,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:41,754 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:41,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 13] total 37 [2024-11-14 02:49:41,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749270407] [2024-11-14 02:49:41,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:41,755 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2024-11-14 02:49:41,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:41,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2024-11-14 02:49:41,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1562, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 02:49:41,758 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 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) [2024-11-14 02:49:42,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:42,275 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2024-11-14 02:49:42,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-14 02:49:42,276 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 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 19 [2024-11-14 02:49:42,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:42,277 INFO L225 Difference]: With dead ends: 29 [2024-11-14 02:49:42,277 INFO L226 Difference]: Without dead ends: 26 [2024-11-14 02:49:42,278 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=208, Invalid=1954, Unknown=0, NotChecked=0, Total=2162 [2024-11-14 02:49:42,278 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:42,279 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 43 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 02:49:42,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-14 02:49:42,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2024-11-14 02:49:42,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2024-11-14 02:49:42,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2024-11-14 02:49:42,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2024-11-14 02:49:42,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:42,284 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2024-11-14 02:49:42,284 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 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) [2024-11-14 02:49:42,285 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2024-11-14 02:49:42,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-14 02:49:42,285 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:42,285 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:42,306 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-14 02:49:42,485 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:42,486 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:42,486 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:42,486 INFO L85 PathProgramCache]: Analyzing trace with hash -178219736, now seen corresponding path program 10 times [2024-11-14 02:49:42,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:42,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632864951] [2024-11-14 02:49:42,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:42,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:42,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:42,659 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:42,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:42,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632864951] [2024-11-14 02:49:42,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632864951] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:42,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543861250] [2024-11-14 02:49:42,660 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:49:42,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:42,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:42,664 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:42,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 02:49:42,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:42,739 INFO L255 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 02:49:42,741 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:42,868 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:42,868 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:42,979 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 02:49:42,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543861250] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:42,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1038273930] [2024-11-14 02:49:42,981 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:42,981 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:42,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:42,981 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:42,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:43,184 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:43,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1730#true' at error location [2024-11-14 02:49:43,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:43,345 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:43,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-14 02:49:43,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482023609] [2024-11-14 02:49:43,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:43,346 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 02:49:43,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:43,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 02:49:43,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2024-11-14 02:49:43,347 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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) [2024-11-14 02:49:43,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:43,448 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2024-11-14 02:49:43,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 02:49:43,449 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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 20 [2024-11-14 02:49:43,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:43,449 INFO L225 Difference]: With dead ends: 42 [2024-11-14 02:49:43,449 INFO L226 Difference]: Without dead ends: 23 [2024-11-14 02:49:43,450 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 40 SyntacticMatches, 9 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2024-11-14 02:49:43,451 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:43,451 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:43,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-14 02:49:43,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-14 02:49:43,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 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) [2024-11-14 02:49:43,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2024-11-14 02:49:43,462 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 20 [2024-11-14 02:49:43,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:43,464 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2024-11-14 02:49:43,464 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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) [2024-11-14 02:49:43,465 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2024-11-14 02:49:43,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-14 02:49:43,465 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:43,465 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:43,488 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-14 02:49:43,665 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-14 02:49:43,666 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:43,666 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:43,666 INFO L85 PathProgramCache]: Analyzing trace with hash 213181473, now seen corresponding path program 11 times [2024-11-14 02:49:43,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:43,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315083430] [2024-11-14 02:49:43,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:43,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:43,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:43,873 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:43,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:43,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315083430] [2024-11-14 02:49:43,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315083430] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:43,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520693777] [2024-11-14 02:49:43,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:49:43,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:43,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:43,876 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:43,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 02:49:43,982 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 02:49:43,982 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:43,984 INFO L255 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 02:49:43,985 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:44,116 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:44,117 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:44,240 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:44,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520693777] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:44,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291608323] [2024-11-14 02:49:44,243 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:44,243 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:44,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:44,243 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:44,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:44,475 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:44,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1985#true' at error location [2024-11-14 02:49:44,622 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:44,622 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:44,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-14 02:49:44,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699794759] [2024-11-14 02:49:44,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:44,622 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 02:49:44,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:44,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 02:49:44,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2024-11-14 02:49:44,623 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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) [2024-11-14 02:49:44,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:44,739 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2024-11-14 02:49:44,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 02:49:44,740 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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 21 [2024-11-14 02:49:44,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:44,740 INFO L225 Difference]: With dead ends: 32 [2024-11-14 02:49:44,740 INFO L226 Difference]: Without dead ends: 23 [2024-11-14 02:49:44,741 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2024-11-14 02:49:44,741 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:44,742 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:44,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-14 02:49:44,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-14 02:49:44,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 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) [2024-11-14 02:49:44,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2024-11-14 02:49:44,753 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2024-11-14 02:49:44,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:44,754 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2024-11-14 02:49:44,754 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 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) [2024-11-14 02:49:44,754 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2024-11-14 02:49:44,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2024-11-14 02:49:44,756 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:44,756 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:44,781 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-14 02:49:44,961 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-14 02:49:44,961 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:44,961 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:44,962 INFO L85 PathProgramCache]: Analyzing trace with hash -707491676, now seen corresponding path program 12 times [2024-11-14 02:49:44,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:44,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681953837] [2024-11-14 02:49:44,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:44,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:44,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:46,335 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:46,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:46,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681953837] [2024-11-14 02:49:46,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681953837] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:46,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966140654] [2024-11-14 02:49:46,336 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:49:46,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:46,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:46,337 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:46,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 02:49:46,429 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:49:46,430 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:46,431 INFO L255 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-14 02:49:46,437 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:46,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:49:46,982 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:46,983 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:47,710 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:47,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966140654] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:47,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [666264553] [2024-11-14 02:49:47,712 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:47,712 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:47,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:47,712 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:47,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:47,913 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:48,210 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2228#true' at error location [2024-11-14 02:49:48,210 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:48,210 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:48,210 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 15] total 44 [2024-11-14 02:49:48,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006531641] [2024-11-14 02:49:48,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:48,211 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-14 02:49:48,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:48,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-14 02:49:48,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2097, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 02:49:48,213 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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) [2024-11-14 02:49:49,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:49,151 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2024-11-14 02:49:49,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 02:49:49,152 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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 22 [2024-11-14 02:49:49,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:49,153 INFO L225 Difference]: With dead ends: 33 [2024-11-14 02:49:49,153 INFO L226 Difference]: Without dead ends: 30 [2024-11-14 02:49:49,154 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=213, Invalid=2649, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 02:49:49,157 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:49,158 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 63 Invalid, 664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-14 02:49:49,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2024-11-14 02:49:49,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2024-11-14 02:49:49,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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) [2024-11-14 02:49:49,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2024-11-14 02:49:49,170 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 22 [2024-11-14 02:49:49,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:49,174 INFO L471 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2024-11-14 02:49:49,174 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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) [2024-11-14 02:49:49,174 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2024-11-14 02:49:49,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2024-11-14 02:49:49,175 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:49,175 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:49,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-14 02:49:49,375 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-14 02:49:49,376 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:49,376 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:49,376 INFO L85 PathProgramCache]: Analyzing trace with hash -458161799, now seen corresponding path program 13 times [2024-11-14 02:49:49,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:49,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255360954] [2024-11-14 02:49:49,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:49,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:49,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:49,609 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:49,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:49,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255360954] [2024-11-14 02:49:49,609 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255360954] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:49,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321145935] [2024-11-14 02:49:49,610 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:49:49,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:49,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:49,612 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:49,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 02:49:49,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:49,715 INFO L255 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 02:49:49,717 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:49,882 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:49,882 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:50,026 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 02:49:50,026 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321145935] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:50,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183520120] [2024-11-14 02:49:50,028 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:50,028 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:50,028 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:50,028 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:50,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:50,243 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:50,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2672#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:50,398 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:50,398 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:50,398 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-14 02:49:50,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842140964] [2024-11-14 02:49:50,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:50,398 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-14 02:49:50,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:50,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-14 02:49:50,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2024-11-14 02:49:50,399 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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) [2024-11-14 02:49:50,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:50,540 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2024-11-14 02:49:50,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 02:49:50,541 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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 23 [2024-11-14 02:49:50,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:50,541 INFO L225 Difference]: With dead ends: 48 [2024-11-14 02:49:50,541 INFO L226 Difference]: Without dead ends: 26 [2024-11-14 02:49:50,542 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 45 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2024-11-14 02:49:50,542 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:50,543 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:50,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-14 02:49:50,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-11-14 02:49:50,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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) [2024-11-14 02:49:50,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2024-11-14 02:49:50,552 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 23 [2024-11-14 02:49:50,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:50,552 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2024-11-14 02:49:50,552 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 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) [2024-11-14 02:49:50,552 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2024-11-14 02:49:50,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-11-14 02:49:50,553 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:50,553 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:50,578 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 02:49:50,757 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-14 02:49:50,757 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:50,757 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:50,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1060953120, now seen corresponding path program 14 times [2024-11-14 02:49:50,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:50,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401332390] [2024-11-14 02:49:50,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:50,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:50,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:51,053 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:51,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:51,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401332390] [2024-11-14 02:49:51,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401332390] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:51,054 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296566938] [2024-11-14 02:49:51,054 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:49:51,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:51,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:51,057 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:51,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 02:49:51,187 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 02:49:51,187 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:51,189 INFO L255 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 02:49:51,191 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:51,497 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:51,497 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:51,788 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:51,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296566938] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:51,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754131106] [2024-11-14 02:49:51,790 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:51,790 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:51,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:51,791 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:51,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:52,006 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:52,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2812#true' at error location [2024-11-14 02:49:52,239 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:52,239 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:52,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 33 [2024-11-14 02:49:52,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643716655] [2024-11-14 02:49:52,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:52,240 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2024-11-14 02:49:52,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:52,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2024-11-14 02:49:52,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1156, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 02:49:52,242 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 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) [2024-11-14 02:49:52,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:52,524 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2024-11-14 02:49:52,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 02:49:52,525 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 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 24 [2024-11-14 02:49:52,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:52,526 INFO L225 Difference]: With dead ends: 36 [2024-11-14 02:49:52,526 INFO L226 Difference]: Without dead ends: 26 [2024-11-14 02:49:52,526 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 44 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 02:49:52,527 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:52,527 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 19 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:52,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-14 02:49:52,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-11-14 02:49:52,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 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) [2024-11-14 02:49:52,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2024-11-14 02:49:52,534 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2024-11-14 02:49:52,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:52,535 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2024-11-14 02:49:52,535 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 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) [2024-11-14 02:49:52,535 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2024-11-14 02:49:52,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-14 02:49:52,535 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:52,536 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:52,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-14 02:49:52,740 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-14 02:49:52,740 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:52,740 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:52,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1968456779, now seen corresponding path program 15 times [2024-11-14 02:49:52,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:52,741 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760403115] [2024-11-14 02:49:52,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:52,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:52,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:54,606 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:54,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:54,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760403115] [2024-11-14 02:49:54,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760403115] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:54,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348062448] [2024-11-14 02:49:54,607 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:49:54,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:54,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:54,610 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:54,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 02:49:54,727 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:49:54,727 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:49:54,729 INFO L255 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 70 conjuncts are in the unsatisfiable core [2024-11-14 02:49:54,732 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:54,787 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:49:55,663 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:49:55,664 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:56,637 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:56,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348062448] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:56,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725751872] [2024-11-14 02:49:56,639 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:56,639 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:56,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:56,639 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:56,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:56,857 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:57,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3305#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:57,206 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:57,206 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:57,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 17] total 51 [2024-11-14 02:49:57,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271742693] [2024-11-14 02:49:57,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:57,206 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-14 02:49:57,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:57,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-14 02:49:57,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=2849, Unknown=0, NotChecked=0, Total=3080 [2024-11-14 02:49:57,208 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 51 states have internal predecessors, (58), 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) [2024-11-14 02:49:58,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:58,354 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2024-11-14 02:49:58,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-14 02:49:58,354 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 51 states have internal predecessors, (58), 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 25 [2024-11-14 02:49:58,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:58,355 INFO L225 Difference]: With dead ends: 37 [2024-11-14 02:49:58,355 INFO L226 Difference]: Without dead ends: 34 [2024-11-14 02:49:58,356 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 879 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=281, Invalid=3379, Unknown=0, NotChecked=0, Total=3660 [2024-11-14 02:49:58,357 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 846 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 846 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:58,357 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 67 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 846 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-14 02:49:58,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2024-11-14 02:49:58,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2024-11-14 02:49:58,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 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) [2024-11-14 02:49:58,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2024-11-14 02:49:58,365 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 25 [2024-11-14 02:49:58,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:58,366 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2024-11-14 02:49:58,366 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 51 states have internal predecessors, (58), 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) [2024-11-14 02:49:58,366 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2024-11-14 02:49:58,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-14 02:49:58,367 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:58,367 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:58,385 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 02:49:58,567 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-14 02:49:58,567 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:49:58,567 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:49:58,568 INFO L85 PathProgramCache]: Analyzing trace with hash -893374328, now seen corresponding path program 16 times [2024-11-14 02:49:58,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:49:58,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135195117] [2024-11-14 02:49:58,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:49:58,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:49:58,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:58,856 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:58,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:49:58,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135195117] [2024-11-14 02:49:58,856 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135195117] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:49:58,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352357548] [2024-11-14 02:49:58,857 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:49:58,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:49:58,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:49:58,859 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:49:58,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 02:49:58,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:49:58,966 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 02:49:58,968 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:49:59,156 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:59,157 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:49:59,324 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 02:49:59,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352357548] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:49:59,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109380107] [2024-11-14 02:49:59,326 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:49:59,326 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:49:59,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:49:59,326 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:49:59,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:49:59,497 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:49:59,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3613#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:49:59,702 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:49:59,702 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:49:59,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-14 02:49:59,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886932068] [2024-11-14 02:49:59,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:49:59,702 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 02:49:59,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:49:59,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 02:49:59,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=760, Unknown=0, NotChecked=0, Total=930 [2024-11-14 02:49:59,704 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 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) [2024-11-14 02:49:59,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:49:59,824 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2024-11-14 02:49:59,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 02:49:59,825 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 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 26 [2024-11-14 02:49:59,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:49:59,826 INFO L225 Difference]: With dead ends: 54 [2024-11-14 02:49:59,826 INFO L226 Difference]: Without dead ends: 29 [2024-11-14 02:49:59,826 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 51 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=170, Invalid=760, Unknown=0, NotChecked=0, Total=930 [2024-11-14 02:49:59,827 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:49:59,827 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:49:59,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-14 02:49:59,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2024-11-14 02:49:59,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 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) [2024-11-14 02:49:59,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2024-11-14 02:49:59,835 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 26 [2024-11-14 02:49:59,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:49:59,835 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2024-11-14 02:49:59,835 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 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) [2024-11-14 02:49:59,835 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2024-11-14 02:49:59,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-14 02:49:59,835 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:49:59,836 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:49:59,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2024-11-14 02:50:00,037 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 02:50:00,037 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:00,038 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:00,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1391353663, now seen corresponding path program 17 times [2024-11-14 02:50:00,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:00,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440800035] [2024-11-14 02:50:00,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:00,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:00,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:00,346 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:00,346 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:00,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440800035] [2024-11-14 02:50:00,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440800035] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:00,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320809982] [2024-11-14 02:50:00,347 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:50:00,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:00,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:00,349 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:00,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-14 02:50:00,499 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-14 02:50:00,499 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:00,501 INFO L255 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 02:50:00,505 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:00,857 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:00,857 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:01,198 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:01,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320809982] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:01,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751806426] [2024-11-14 02:50:01,200 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:01,200 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:01,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:01,201 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:01,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:01,386 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:01,576 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3771#true' at error location [2024-11-14 02:50:01,576 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:01,576 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:01,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2024-11-14 02:50:01,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080990539] [2024-11-14 02:50:01,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:01,576 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 02:50:01,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:01,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 02:50:01,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1498, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 02:50:01,578 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 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) [2024-11-14 02:50:01,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:01,849 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2024-11-14 02:50:01,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-14 02:50:01,849 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 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 27 [2024-11-14 02:50:01,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:01,850 INFO L225 Difference]: With dead ends: 40 [2024-11-14 02:50:01,850 INFO L226 Difference]: Without dead ends: 29 [2024-11-14 02:50:01,851 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 49 SyntacticMatches, 7 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=314, Invalid=2038, Unknown=0, NotChecked=0, Total=2352 [2024-11-14 02:50:01,851 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:01,852 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 27 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:01,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-14 02:50:01,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2024-11-14 02:50:01,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 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) [2024-11-14 02:50:01,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2024-11-14 02:50:01,862 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2024-11-14 02:50:01,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:01,862 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2024-11-14 02:50:01,862 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 states have internal predecessors, (46), 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) [2024-11-14 02:50:01,862 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2024-11-14 02:50:01,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-11-14 02:50:01,863 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:01,863 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:01,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2024-11-14 02:50:02,064 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:02,064 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:02,064 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:02,064 INFO L85 PathProgramCache]: Analyzing trace with hash 616480260, now seen corresponding path program 18 times [2024-11-14 02:50:02,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:02,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637157438] [2024-11-14 02:50:02,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:02,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:02,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:03,879 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:03,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:03,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637157438] [2024-11-14 02:50:03,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637157438] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:03,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470621925] [2024-11-14 02:50:03,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:50:03,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:03,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:03,882 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:03,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-14 02:50:03,984 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:50:03,984 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:03,986 INFO L255 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 78 conjuncts are in the unsatisfiable core [2024-11-14 02:50:03,989 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:04,074 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:50:04,668 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:04,668 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:06,003 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:06,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470621925] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:06,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1613039273] [2024-11-14 02:50:06,004 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:06,004 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:06,005 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:06,005 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:06,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:06,154 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:06,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4108#true' at error location [2024-11-14 02:50:06,496 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:06,496 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:06,496 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 19] total 54 [2024-11-14 02:50:06,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288237879] [2024-11-14 02:50:06,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:06,497 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2024-11-14 02:50:06,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:06,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2024-11-14 02:50:06,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=3100, Unknown=0, NotChecked=0, Total=3306 [2024-11-14 02:50:06,499 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 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) [2024-11-14 02:50:07,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:07,795 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2024-11-14 02:50:07,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-11-14 02:50:07,796 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 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 28 [2024-11-14 02:50:07,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:07,796 INFO L225 Difference]: With dead ends: 41 [2024-11-14 02:50:07,796 INFO L226 Difference]: Without dead ends: 38 [2024-11-14 02:50:07,797 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=269, Invalid=3891, Unknown=0, NotChecked=0, Total=4160 [2024-11-14 02:50:07,798 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:07,798 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 71 Invalid, 999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-14 02:50:07,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-14 02:50:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2024-11-14 02:50:07,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 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) [2024-11-14 02:50:07,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2024-11-14 02:50:07,809 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 28 [2024-11-14 02:50:07,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:07,809 INFO L471 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2024-11-14 02:50:07,809 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 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) [2024-11-14 02:50:07,810 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2024-11-14 02:50:07,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2024-11-14 02:50:07,811 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:07,811 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:07,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-14 02:50:08,011 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:08,012 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:08,012 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:08,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1930262553, now seen corresponding path program 19 times [2024-11-14 02:50:08,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:08,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818168982] [2024-11-14 02:50:08,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:08,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:08,339 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:08,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:08,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818168982] [2024-11-14 02:50:08,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818168982] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:08,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501637501] [2024-11-14 02:50:08,340 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:50:08,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:08,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:08,343 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:08,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-14 02:50:08,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:08,466 INFO L255 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-14 02:50:08,468 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:08,761 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:08,761 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:08,987 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 02:50:08,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501637501] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:08,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [845005894] [2024-11-14 02:50:08,989 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:08,990 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:08,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:08,990 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:08,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:09,190 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:09,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4473#true' at error location [2024-11-14 02:50:09,361 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:09,361 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:09,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-14 02:50:09,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619123817] [2024-11-14 02:50:09,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:09,362 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 02:50:09,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:09,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 02:50:09,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 02:50:09,363 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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) [2024-11-14 02:50:09,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:09,472 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2024-11-14 02:50:09,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-14 02:50:09,473 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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 29 [2024-11-14 02:50:09,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:09,473 INFO L225 Difference]: With dead ends: 60 [2024-11-14 02:50:09,473 INFO L226 Difference]: Without dead ends: 32 [2024-11-14 02:50:09,474 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 58 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 02:50:09,474 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:09,474 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:09,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2024-11-14 02:50:09,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2024-11-14 02:50:09,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 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) [2024-11-14 02:50:09,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2024-11-14 02:50:09,483 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2024-11-14 02:50:09,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:09,483 INFO L471 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2024-11-14 02:50:09,483 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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) [2024-11-14 02:50:09,483 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2024-11-14 02:50:09,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-11-14 02:50:09,484 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:09,484 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:09,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-14 02:50:09,684 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-14 02:50:09,684 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:09,685 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:09,685 INFO L85 PathProgramCache]: Analyzing trace with hash 1444933952, now seen corresponding path program 20 times [2024-11-14 02:50:09,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:09,685 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527551574] [2024-11-14 02:50:09,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:09,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:09,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:10,119 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:10,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:10,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527551574] [2024-11-14 02:50:10,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527551574] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:10,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098466124] [2024-11-14 02:50:10,120 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:50:10,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:10,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:10,123 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:10,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-14 02:50:10,240 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-14 02:50:10,240 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:10,242 INFO L255 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-14 02:50:10,243 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:10,425 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:10,610 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:10,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098466124] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:10,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [779297952] [2024-11-14 02:50:10,612 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:10,612 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:10,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:10,612 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:10,613 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:10,758 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:10,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4845#true' at error location [2024-11-14 02:50:10,892 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:10,892 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:10,893 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-14 02:50:10,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132261997] [2024-11-14 02:50:10,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:10,893 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 02:50:10,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:10,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 02:50:10,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 02:50:10,894 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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) [2024-11-14 02:50:11,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:11,002 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2024-11-14 02:50:11,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 02:50:11,003 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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 30 [2024-11-14 02:50:11,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:11,004 INFO L225 Difference]: With dead ends: 44 [2024-11-14 02:50:11,004 INFO L226 Difference]: Without dead ends: 32 [2024-11-14 02:50:11,004 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 60 SyntacticMatches, 16 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=222, Invalid=900, Unknown=0, NotChecked=0, Total=1122 [2024-11-14 02:50:11,006 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:11,006 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:11,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2024-11-14 02:50:11,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2024-11-14 02:50:11,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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) [2024-11-14 02:50:11,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2024-11-14 02:50:11,024 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2024-11-14 02:50:11,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:11,024 INFO L471 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2024-11-14 02:50:11,024 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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) [2024-11-14 02:50:11,025 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2024-11-14 02:50:11,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2024-11-14 02:50:11,025 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:11,025 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:11,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-14 02:50:11,225 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-14 02:50:11,226 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:11,226 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:11,226 INFO L85 PathProgramCache]: Analyzing trace with hash 858061909, now seen corresponding path program 21 times [2024-11-14 02:50:11,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:11,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114760100] [2024-11-14 02:50:11,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:11,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:11,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:13,560 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:13,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:13,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114760100] [2024-11-14 02:50:13,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114760100] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:13,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558181993] [2024-11-14 02:50:13,561 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:50:13,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:13,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:13,563 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:13,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-14 02:50:13,685 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:50:13,685 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:13,688 INFO L255 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 90 conjuncts are in the unsatisfiable core [2024-11-14 02:50:13,691 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:13,752 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:50:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:14,736 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:16,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558181993] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:16,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1257591655] [2024-11-14 02:50:16,404 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:16,405 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:16,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:16,405 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:16,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:16,541 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:16,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5193#true' at error location [2024-11-14 02:50:16,942 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:16,942 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:16,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 21] total 60 [2024-11-14 02:50:16,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542640865] [2024-11-14 02:50:16,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:16,942 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2024-11-14 02:50:16,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:16,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2024-11-14 02:50:16,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3806, Unknown=0, NotChecked=0, Total=4032 [2024-11-14 02:50:16,945 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 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) [2024-11-14 02:50:18,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:18,595 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2024-11-14 02:50:18,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-14 02:50:18,599 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 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 31 [2024-11-14 02:50:18,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:18,599 INFO L225 Difference]: With dead ends: 45 [2024-11-14 02:50:18,600 INFO L226 Difference]: Without dead ends: 42 [2024-11-14 02:50:18,600 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1016 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=319, Invalid=4937, Unknown=0, NotChecked=0, Total=5256 [2024-11-14 02:50:18,601 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 1120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:18,601 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 71 Invalid, 1122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1120 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-14 02:50:18,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-14 02:50:18,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2024-11-14 02:50:18,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 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) [2024-11-14 02:50:18,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2024-11-14 02:50:18,621 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 31 [2024-11-14 02:50:18,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:18,621 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2024-11-14 02:50:18,621 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 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) [2024-11-14 02:50:18,621 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2024-11-14 02:50:18,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-14 02:50:18,622 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:18,622 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:18,644 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-14 02:50:18,822 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:18,823 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:18,823 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:18,823 INFO L85 PathProgramCache]: Analyzing trace with hash 829359080, now seen corresponding path program 22 times [2024-11-14 02:50:18,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:18,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309174424] [2024-11-14 02:50:18,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:18,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:18,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:19,201 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:19,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:19,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309174424] [2024-11-14 02:50:19,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309174424] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:19,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521794343] [2024-11-14 02:50:19,202 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:50:19,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:19,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:19,205 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:19,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-14 02:50:19,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:19,336 INFO L255 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 02:50:19,337 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:19,666 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:19,667 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:19,951 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 02:50:19,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521794343] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:19,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1116386078] [2024-11-14 02:50:19,952 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:19,952 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:19,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:19,953 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:19,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:20,168 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:20,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5600#true' at error location [2024-11-14 02:50:20,343 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:20,343 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:20,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-14 02:50:20,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115536889] [2024-11-14 02:50:20,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:20,344 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-14 02:50:20,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:20,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-14 02:50:20,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 02:50:20,345 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2024-11-14 02:50:20,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:20,531 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2024-11-14 02:50:20,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 02:50:20,531 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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 32 [2024-11-14 02:50:20,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:20,532 INFO L225 Difference]: With dead ends: 66 [2024-11-14 02:50:20,532 INFO L226 Difference]: Without dead ends: 35 [2024-11-14 02:50:20,533 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 64 SyntacticMatches, 17 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 02:50:20,533 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:20,533 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:20,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-14 02:50:20,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2024-11-14 02:50:20,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 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) [2024-11-14 02:50:20,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2024-11-14 02:50:20,557 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 32 [2024-11-14 02:50:20,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:20,558 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2024-11-14 02:50:20,558 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2024-11-14 02:50:20,558 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2024-11-14 02:50:20,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-14 02:50:20,560 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:20,560 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:20,583 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-14 02:50:20,760 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:20,760 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:20,761 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:20,761 INFO L85 PathProgramCache]: Analyzing trace with hash -735074975, now seen corresponding path program 23 times [2024-11-14 02:50:20,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:20,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474431277] [2024-11-14 02:50:20,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:20,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:20,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:21,146 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:21,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:21,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474431277] [2024-11-14 02:50:21,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474431277] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:21,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500308823] [2024-11-14 02:50:21,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:50:21,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:21,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:21,150 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:21,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-14 02:50:21,285 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 02:50:21,285 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:21,287 INFO L255 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 02:50:21,288 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:21,483 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:21,680 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:21,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500308823] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:21,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1310090979] [2024-11-14 02:50:21,681 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:21,681 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:21,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:21,681 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:21,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:21,829 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:21,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6011#true' at error location [2024-11-14 02:50:21,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:21,956 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:21,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-14 02:50:21,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215646598] [2024-11-14 02:50:21,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:21,957 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-14 02:50:21,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:21,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-14 02:50:21,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 02:50:21,958 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2024-11-14 02:50:22,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:22,098 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2024-11-14 02:50:22,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-14 02:50:22,099 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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 33 [2024-11-14 02:50:22,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:22,099 INFO L225 Difference]: With dead ends: 48 [2024-11-14 02:50:22,099 INFO L226 Difference]: Without dead ends: 35 [2024-11-14 02:50:22,100 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 66 SyntacticMatches, 18 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 02:50:22,100 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:22,101 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:22,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-14 02:50:22,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2024-11-14 02:50:22,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 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) [2024-11-14 02:50:22,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2024-11-14 02:50:22,114 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2024-11-14 02:50:22,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:22,114 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2024-11-14 02:50:22,114 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2024-11-14 02:50:22,114 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2024-11-14 02:50:22,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-14 02:50:22,114 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:22,114 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:22,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2024-11-14 02:50:22,315 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:22,315 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:22,315 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:22,315 INFO L85 PathProgramCache]: Analyzing trace with hash -1766773916, now seen corresponding path program 24 times [2024-11-14 02:50:22,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:22,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990575559] [2024-11-14 02:50:22,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:22,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:22,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:25,093 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:25,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:25,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990575559] [2024-11-14 02:50:25,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990575559] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:25,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096332636] [2024-11-14 02:50:25,094 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:50:25,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:25,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:25,096 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:25,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-14 02:50:25,234 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:50:25,234 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:25,237 INFO L255 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 98 conjuncts are in the unsatisfiable core [2024-11-14 02:50:25,239 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:25,295 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:50:26,381 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:26,381 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:28,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096332636] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:28,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141984467] [2024-11-14 02:50:28,721 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:28,721 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:28,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:28,721 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:28,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:28,850 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:29,316 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6394#true' at error location [2024-11-14 02:50:29,316 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:29,316 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:29,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 23] total 67 [2024-11-14 02:50:29,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876069904] [2024-11-14 02:50:29,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:29,317 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2024-11-14 02:50:29,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:29,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2024-11-14 02:50:29,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=4707, Unknown=0, NotChecked=0, Total=4970 [2024-11-14 02:50:29,319 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 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) [2024-11-14 02:50:31,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:31,686 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2024-11-14 02:50:31,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 02:50:31,686 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 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 34 [2024-11-14 02:50:31,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:31,687 INFO L225 Difference]: With dead ends: 49 [2024-11-14 02:50:31,687 INFO L226 Difference]: Without dead ends: 46 [2024-11-14 02:50:31,687 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=347, Invalid=5815, Unknown=0, NotChecked=0, Total=6162 [2024-11-14 02:50:31,687 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 1525 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:31,688 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 89 Invalid, 1526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1525 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2024-11-14 02:50:31,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2024-11-14 02:50:31,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 37. [2024-11-14 02:50:31,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 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) [2024-11-14 02:50:31,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2024-11-14 02:50:31,699 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 34 [2024-11-14 02:50:31,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:31,699 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2024-11-14 02:50:31,699 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 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) [2024-11-14 02:50:31,699 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2024-11-14 02:50:31,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2024-11-14 02:50:31,699 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:31,700 INFO L215 NwaCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:31,714 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2024-11-14 02:50:31,900 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-14 02:50:31,900 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:31,900 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:31,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1063827129, now seen corresponding path program 25 times [2024-11-14 02:50:31,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:31,900 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119876599] [2024-11-14 02:50:31,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:31,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:31,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:32,252 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:32,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:32,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119876599] [2024-11-14 02:50:32,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119876599] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:32,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167215746] [2024-11-14 02:50:32,252 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:50:32,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:32,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:32,254 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:32,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-14 02:50:32,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:32,378 INFO L255 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-14 02:50:32,379 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:32,643 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:32,643 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:32,856 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 02:50:32,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167215746] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:32,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [468501583] [2024-11-14 02:50:32,858 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:32,858 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:32,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:32,858 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:32,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:33,003 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:33,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6838#true' at error location [2024-11-14 02:50:33,231 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:33,231 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:33,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-14 02:50:33,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294350729] [2024-11-14 02:50:33,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:33,232 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-14 02:50:33,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:33,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-14 02:50:33,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1183, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 02:50:33,233 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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) [2024-11-14 02:50:33,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:33,409 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2024-11-14 02:50:33,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-14 02:50:33,410 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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 35 [2024-11-14 02:50:33,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:33,410 INFO L225 Difference]: With dead ends: 72 [2024-11-14 02:50:33,410 INFO L226 Difference]: Without dead ends: 38 [2024-11-14 02:50:33,411 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 70 SyntacticMatches, 19 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=299, Invalid=1183, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 02:50:33,411 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:33,412 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:33,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-14 02:50:33,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2024-11-14 02:50:33,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 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) [2024-11-14 02:50:33,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2024-11-14 02:50:33,438 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 35 [2024-11-14 02:50:33,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:33,438 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2024-11-14 02:50:33,438 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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) [2024-11-14 02:50:33,438 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2024-11-14 02:50:33,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2024-11-14 02:50:33,439 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:33,439 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:33,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2024-11-14 02:50:33,639 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-14 02:50:33,640 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:33,640 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:33,640 INFO L85 PathProgramCache]: Analyzing trace with hash -300976480, now seen corresponding path program 26 times [2024-11-14 02:50:33,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:33,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558122686] [2024-11-14 02:50:33,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:33,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:33,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:34,099 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:34,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:34,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558122686] [2024-11-14 02:50:34,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558122686] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:34,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180587241] [2024-11-14 02:50:34,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:50:34,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:34,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:34,102 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:34,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-14 02:50:34,320 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 02:50:34,320 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:34,322 INFO L255 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-14 02:50:34,323 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:34,581 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:34,581 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:34,819 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:34,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180587241] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:34,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1293639262] [2024-11-14 02:50:34,820 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:34,820 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:34,820 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:34,820 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:34,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:35,016 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:35,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7288#true' at error location [2024-11-14 02:50:35,203 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:35,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:35,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-14 02:50:35,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463200053] [2024-11-14 02:50:35,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:35,204 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-14 02:50:35,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:35,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-14 02:50:35,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1183, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 02:50:35,206 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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) [2024-11-14 02:50:35,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:35,398 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2024-11-14 02:50:35,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 02:50:35,398 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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 36 [2024-11-14 02:50:35,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:35,399 INFO L225 Difference]: With dead ends: 52 [2024-11-14 02:50:35,399 INFO L226 Difference]: Without dead ends: 38 [2024-11-14 02:50:35,400 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 72 SyntacticMatches, 20 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=312, Invalid=1248, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 02:50:35,400 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:35,400 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 25 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:35,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-14 02:50:35,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2024-11-14 02:50:35,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 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) [2024-11-14 02:50:35,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2024-11-14 02:50:35,413 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 36 [2024-11-14 02:50:35,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:35,413 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2024-11-14 02:50:35,413 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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) [2024-11-14 02:50:35,413 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2024-11-14 02:50:35,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2024-11-14 02:50:35,414 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:35,414 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:35,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-14 02:50:35,614 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-14 02:50:35,614 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:35,615 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:35,615 INFO L85 PathProgramCache]: Analyzing trace with hash -1915616011, now seen corresponding path program 27 times [2024-11-14 02:50:35,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:35,615 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107359329] [2024-11-14 02:50:35,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:35,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:35,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:39,100 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:39,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:39,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107359329] [2024-11-14 02:50:39,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107359329] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:39,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523982764] [2024-11-14 02:50:39,101 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:50:39,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:39,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:39,103 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:39,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-14 02:50:39,269 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:50:39,269 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:39,273 INFO L255 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 110 conjuncts are in the unsatisfiable core [2024-11-14 02:50:39,276 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:39,357 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:50:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:40,799 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:43,725 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:43,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523982764] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:43,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337005802] [2024-11-14 02:50:43,726 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:43,726 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:43,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:43,726 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:43,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:43,870 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:44,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7706#true' at error location [2024-11-14 02:50:44,365 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:44,365 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:44,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 25] total 74 [2024-11-14 02:50:44,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088053463] [2024-11-14 02:50:44,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:44,366 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2024-11-14 02:50:44,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:44,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2024-11-14 02:50:44,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5717, Unknown=0, NotChecked=0, Total=6006 [2024-11-14 02:50:44,368 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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) [2024-11-14 02:50:46,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:46,867 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2024-11-14 02:50:46,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2024-11-14 02:50:46,867 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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 37 [2024-11-14 02:50:46,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:46,868 INFO L225 Difference]: With dead ends: 53 [2024-11-14 02:50:46,868 INFO L226 Difference]: Without dead ends: 50 [2024-11-14 02:50:46,869 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1494 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=413, Invalid=7419, Unknown=0, NotChecked=0, Total=7832 [2024-11-14 02:50:46,870 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 1547 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:46,870 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 79 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1547 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-11-14 02:50:46,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2024-11-14 02:50:46,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 40. [2024-11-14 02:50:46,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) [2024-11-14 02:50:46,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2024-11-14 02:50:46,895 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 37 [2024-11-14 02:50:46,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:46,895 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2024-11-14 02:50:46,896 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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) [2024-11-14 02:50:46,896 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2024-11-14 02:50:46,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2024-11-14 02:50:46,896 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:46,896 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:46,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2024-11-14 02:50:47,097 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-14 02:50:47,097 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:47,097 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:47,098 INFO L85 PathProgramCache]: Analyzing trace with hash 744689480, now seen corresponding path program 28 times [2024-11-14 02:50:47,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:47,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636171069] [2024-11-14 02:50:47,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:47,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:47,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:47,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:47,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636171069] [2024-11-14 02:50:47,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636171069] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:47,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597092393] [2024-11-14 02:50:47,483 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:50:47,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:47,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:47,485 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:47,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-14 02:50:47,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:47,645 INFO L255 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-14 02:50:47,646 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:48,005 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:48,005 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 02:50:48,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597092393] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:48,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533767101] [2024-11-14 02:50:48,295 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:48,295 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:48,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:48,295 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:48,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:48,436 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:48,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8195#true' at error location [2024-11-14 02:50:48,620 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:48,620 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:48,620 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-14 02:50:48,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882616751] [2024-11-14 02:50:48,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:48,621 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 02:50:48,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:48,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 02:50:48,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 02:50:48,622 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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) [2024-11-14 02:50:48,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:48,796 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2024-11-14 02:50:48,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 02:50:48,796 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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 38 [2024-11-14 02:50:48,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:48,797 INFO L225 Difference]: With dead ends: 78 [2024-11-14 02:50:48,797 INFO L226 Difference]: Without dead ends: 41 [2024-11-14 02:50:48,797 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 76 SyntacticMatches, 21 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 02:50:48,798 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:48,798 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:48,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-14 02:50:48,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2024-11-14 02:50:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 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) [2024-11-14 02:50:48,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2024-11-14 02:50:48,813 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 38 [2024-11-14 02:50:48,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:48,814 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2024-11-14 02:50:48,814 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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) [2024-11-14 02:50:48,814 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2024-11-14 02:50:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-11-14 02:50:48,814 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:48,814 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:48,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2024-11-14 02:50:49,015 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:49,015 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:49,015 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:49,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1959202303, now seen corresponding path program 29 times [2024-11-14 02:50:49,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:49,015 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547495843] [2024-11-14 02:50:49,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:49,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:49,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:49,375 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:50:49,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:49,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547495843] [2024-11-14 02:50:49,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547495843] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:49,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871589986] [2024-11-14 02:50:49,376 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:50:49,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:49,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:49,378 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:49,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-14 02:50:49,599 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 02:50:49,599 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:49,601 INFO L255 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-14 02:50:49,602 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:49,857 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:50:49,857 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:50:50,109 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:50:50,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871589986] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:50:50,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2107805716] [2024-11-14 02:50:50,110 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:50:50,111 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:50:50,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:50:50,111 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:50:50,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:50:50,256 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:50:50,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8950#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:50:50,411 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:50:50,411 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:50:50,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-14 02:50:50,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102885458] [2024-11-14 02:50:50,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:50:50,412 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 02:50:50,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:50:50,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 02:50:50,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1453, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 02:50:50,413 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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) [2024-11-14 02:50:50,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:50:50,565 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2024-11-14 02:50:50,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 02:50:50,565 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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 39 [2024-11-14 02:50:50,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:50:50,566 INFO L225 Difference]: With dead ends: 56 [2024-11-14 02:50:50,566 INFO L226 Difference]: Without dead ends: 41 [2024-11-14 02:50:50,567 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 77 SyntacticMatches, 22 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=367, Invalid=1525, Unknown=0, NotChecked=0, Total=1892 [2024-11-14 02:50:50,567 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:50:50,567 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:50:50,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-14 02:50:50,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2024-11-14 02:50:50,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.075) internal successors, (43), 40 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) [2024-11-14 02:50:50,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2024-11-14 02:50:50,581 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 39 [2024-11-14 02:50:50,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:50:50,581 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2024-11-14 02:50:50,582 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 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) [2024-11-14 02:50:50,582 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2024-11-14 02:50:50,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-11-14 02:50:50,582 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:50:50,582 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:50:50,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2024-11-14 02:50:50,783 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2024-11-14 02:50:50,783 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:50:50,783 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:50:50,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1637994692, now seen corresponding path program 30 times [2024-11-14 02:50:50,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:50:50,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684270688] [2024-11-14 02:50:50,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:50:50,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:50:50,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:50:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 15 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:55,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:50:55,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684270688] [2024-11-14 02:50:55,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684270688] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:50:55,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639956082] [2024-11-14 02:50:55,922 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:50:55,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:50:55,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:50:55,923 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:50:55,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-14 02:50:56,061 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:50:56,061 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:50:56,064 INFO L255 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 118 conjuncts are in the unsatisfiable core [2024-11-14 02:50:56,066 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:50:56,443 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:50:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:50:58,182 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:02,036 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:51:02,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639956082] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:02,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824952008] [2024-11-14 02:51:02,037 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:02,037 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:02,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:02,037 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:02,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:02,166 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:02,691 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9138#true' at error location [2024-11-14 02:51:02,691 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:02,691 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:02,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 27] total 88 [2024-11-14 02:51:02,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868727322] [2024-11-14 02:51:02,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:02,692 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2024-11-14 02:51:02,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:02,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2024-11-14 02:51:02,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=7993, Unknown=0, NotChecked=0, Total=8372 [2024-11-14 02:51:02,693 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 88 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 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) [2024-11-14 02:51:05,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:05,850 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2024-11-14 02:51:05,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2024-11-14 02:51:05,851 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 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 40 [2024-11-14 02:51:05,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:05,852 INFO L225 Difference]: With dead ends: 57 [2024-11-14 02:51:05,852 INFO L226 Difference]: Without dead ends: 54 [2024-11-14 02:51:05,853 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2739 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=533, Invalid=10387, Unknown=0, NotChecked=0, Total=10920 [2024-11-14 02:51:05,853 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 1997 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 2001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1997 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:05,853 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 101 Invalid, 2001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1997 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2024-11-14 02:51:05,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-14 02:51:05,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 43. [2024-11-14 02:51:05,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 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) [2024-11-14 02:51:05,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2024-11-14 02:51:05,881 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 40 [2024-11-14 02:51:05,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:05,881 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2024-11-14 02:51:05,881 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 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) [2024-11-14 02:51:05,882 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2024-11-14 02:51:05,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2024-11-14 02:51:05,882 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:05,882 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:05,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-14 02:51:06,082 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:06,083 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:06,083 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:06,083 INFO L85 PathProgramCache]: Analyzing trace with hash -762528423, now seen corresponding path program 31 times [2024-11-14 02:51:06,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:06,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476516583] [2024-11-14 02:51:06,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:06,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:06,564 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:51:06,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:06,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476516583] [2024-11-14 02:51:06,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476516583] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:06,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048022414] [2024-11-14 02:51:06,565 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:51:06,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:06,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:06,570 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:06,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-14 02:51:06,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:06,760 INFO L255 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-14 02:51:06,762 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:07,216 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:51:07,217 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:07,560 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 02:51:07,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048022414] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:07,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1670590161] [2024-11-14 02:51:07,561 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:07,562 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:07,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:07,562 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:07,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:07,684 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:07,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9677#true' at error location [2024-11-14 02:51:07,877 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:07,877 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:07,877 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-14 02:51:07,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768029962] [2024-11-14 02:51:07,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:07,878 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-14 02:51:07,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:07,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-14 02:51:07,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1577, Unknown=0, NotChecked=0, Total=1980 [2024-11-14 02:51:07,879 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 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) [2024-11-14 02:51:08,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:08,083 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2024-11-14 02:51:08,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 02:51:08,084 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 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 41 [2024-11-14 02:51:08,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:08,085 INFO L225 Difference]: With dead ends: 84 [2024-11-14 02:51:08,085 INFO L226 Difference]: Without dead ends: 44 [2024-11-14 02:51:08,085 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 82 SyntacticMatches, 23 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=403, Invalid=1577, Unknown=0, NotChecked=0, Total=1980 [2024-11-14 02:51:08,086 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:08,086 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:51:08,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-14 02:51:08,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2024-11-14 02:51:08,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 states have internal predecessors, (47), 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) [2024-11-14 02:51:08,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2024-11-14 02:51:08,105 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 41 [2024-11-14 02:51:08,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:08,105 INFO L471 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2024-11-14 02:51:08,105 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 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) [2024-11-14 02:51:08,106 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2024-11-14 02:51:08,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2024-11-14 02:51:08,106 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:08,106 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:08,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2024-11-14 02:51:08,306 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:08,306 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:08,307 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:08,307 INFO L85 PathProgramCache]: Analyzing trace with hash -290999296, now seen corresponding path program 32 times [2024-11-14 02:51:08,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:08,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700595559] [2024-11-14 02:51:08,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:08,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:08,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:08,954 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:08,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:08,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700595559] [2024-11-14 02:51:08,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700595559] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:08,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191254510] [2024-11-14 02:51:08,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:51:08,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:08,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:08,958 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:08,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-14 02:51:09,268 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 02:51:09,268 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:51:09,271 INFO L255 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-14 02:51:09,272 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:10,068 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:10,069 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:10,801 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:10,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191254510] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:10,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715247996] [2024-11-14 02:51:10,803 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:10,803 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:10,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:10,803 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:10,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:11,012 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:11,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10205#true' at error location [2024-11-14 02:51:11,319 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:11,319 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:11,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2024-11-14 02:51:11,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359770614] [2024-11-14 02:51:11,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:11,320 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2024-11-14 02:51:11,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:11,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2024-11-14 02:51:11,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=3868, Unknown=0, NotChecked=0, Total=4422 [2024-11-14 02:51:11,322 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 63 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 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) [2024-11-14 02:51:11,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:11,932 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2024-11-14 02:51:11,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 02:51:11,933 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 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 42 [2024-11-14 02:51:11,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:11,934 INFO L225 Difference]: With dead ends: 60 [2024-11-14 02:51:11,934 INFO L226 Difference]: Without dead ends: 44 [2024-11-14 02:51:11,934 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 74 SyntacticMatches, 12 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=799, Invalid=5363, Unknown=0, NotChecked=0, Total=6162 [2024-11-14 02:51:11,935 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:11,935 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 37 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:51:11,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-14 02:51:11,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2024-11-14 02:51:11,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 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) [2024-11-14 02:51:11,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2024-11-14 02:51:11,959 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2024-11-14 02:51:11,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:11,959 INFO L471 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2024-11-14 02:51:11,959 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 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) [2024-11-14 02:51:11,959 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2024-11-14 02:51:11,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-14 02:51:11,960 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:11,960 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:11,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2024-11-14 02:51:12,160 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2024-11-14 02:51:12,160 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:12,161 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:12,161 INFO L85 PathProgramCache]: Analyzing trace with hash 427611541, now seen corresponding path program 33 times [2024-11-14 02:51:12,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:12,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930085323] [2024-11-14 02:51:12,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:12,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:12,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:18,094 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 28 proven. 206 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:51:18,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:18,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930085323] [2024-11-14 02:51:18,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930085323] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:18,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347815987] [2024-11-14 02:51:18,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:51:18,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:18,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:18,097 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:18,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-14 02:51:18,279 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:51:18,280 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:51:18,283 INFO L255 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 130 conjuncts are in the unsatisfiable core [2024-11-14 02:51:18,285 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:18,799 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:51:21,019 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:51:21,019 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:25,292 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:25,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347815987] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:25,292 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [61979936] [2024-11-14 02:51:25,293 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:25,293 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:25,293 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:25,293 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:25,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:25,418 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:25,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10737#true' at error location [2024-11-14 02:51:25,976 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:25,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:25,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 29] total 96 [2024-11-14 02:51:25,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085824370] [2024-11-14 02:51:25,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:25,977 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2024-11-14 02:51:25,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:25,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2024-11-14 02:51:25,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=9464, Unknown=0, NotChecked=0, Total=9900 [2024-11-14 02:51:25,978 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 96 states, 96 states have (on average 1.0729166666666667) internal successors, (103), 96 states have internal predecessors, (103), 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) [2024-11-14 02:51:29,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:29,792 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2024-11-14 02:51:29,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-14 02:51:29,793 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.0729166666666667) internal successors, (103), 96 states have internal predecessors, (103), 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 43 [2024-11-14 02:51:29,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:29,794 INFO L225 Difference]: With dead ends: 61 [2024-11-14 02:51:29,794 INFO L226 Difference]: Without dead ends: 58 [2024-11-14 02:51:29,795 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3381 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=609, Invalid=12273, Unknown=0, NotChecked=0, Total=12882 [2024-11-14 02:51:29,795 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 2219 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 2221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 2219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:29,795 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 103 Invalid, 2221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 2219 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2024-11-14 02:51:29,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-11-14 02:51:29,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2024-11-14 02:51:29,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 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) [2024-11-14 02:51:29,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2024-11-14 02:51:29,818 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2024-11-14 02:51:29,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:29,818 INFO L471 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2024-11-14 02:51:29,818 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.0729166666666667) internal successors, (103), 96 states have internal predecessors, (103), 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) [2024-11-14 02:51:29,818 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2024-11-14 02:51:29,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2024-11-14 02:51:29,818 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:29,819 INFO L215 NwaCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:29,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2024-11-14 02:51:30,019 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2024-11-14 02:51:30,019 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:30,019 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:30,019 INFO L85 PathProgramCache]: Analyzing trace with hash 370299560, now seen corresponding path program 34 times [2024-11-14 02:51:30,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:30,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653936115] [2024-11-14 02:51:30,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:30,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:30,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:30,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:30,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653936115] [2024-11-14 02:51:30,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653936115] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:30,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580728847] [2024-11-14 02:51:30,607 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:51:30,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:30,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:30,609 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:30,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2024-11-14 02:51:30,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:30,803 INFO L255 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 02:51:30,804 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:31,292 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:31,293 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:31,657 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 02:51:31,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580728847] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:31,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [311590558] [2024-11-14 02:51:31,659 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:31,659 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:31,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:31,659 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:31,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:31,783 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:31,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11318#true' at error location [2024-11-14 02:51:31,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:31,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:31,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2024-11-14 02:51:31,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789794564] [2024-11-14 02:51:31,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:31,983 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-14 02:51:31,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:31,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-14 02:51:31,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1795, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 02:51:31,984 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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) [2024-11-14 02:51:32,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:32,214 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2024-11-14 02:51:32,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 02:51:32,215 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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 44 [2024-11-14 02:51:32,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:32,216 INFO L225 Difference]: With dead ends: 90 [2024-11-14 02:51:32,216 INFO L226 Difference]: Without dead ends: 47 [2024-11-14 02:51:32,216 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 88 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=461, Invalid=1795, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 02:51:32,217 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:32,217 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:51:32,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-14 02:51:32,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-14 02:51:32,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 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) [2024-11-14 02:51:32,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2024-11-14 02:51:32,242 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 44 [2024-11-14 02:51:32,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:32,242 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2024-11-14 02:51:32,242 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 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) [2024-11-14 02:51:32,242 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2024-11-14 02:51:32,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2024-11-14 02:51:32,243 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:32,243 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:32,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2024-11-14 02:51:32,443 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2024-11-14 02:51:32,443 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:32,444 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:32,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1143503199, now seen corresponding path program 35 times [2024-11-14 02:51:32,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:32,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321923118] [2024-11-14 02:51:32,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:32,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:32,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:32,992 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:32,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:32,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321923118] [2024-11-14 02:51:32,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321923118] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:32,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406157318] [2024-11-14 02:51:32,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:51:32,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:32,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:32,995 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:32,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2024-11-14 02:51:33,264 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-14 02:51:33,264 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:51:33,267 INFO L255 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 02:51:33,268 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:34,009 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:34,009 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:34,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406157318] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:34,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534179823] [2024-11-14 02:51:34,821 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:34,821 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:34,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:34,822 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:34,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:35,008 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:35,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12217#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:51:35,390 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:35,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:35,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 68 [2024-11-14 02:51:35,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899282240] [2024-11-14 02:51:35,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:35,391 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2024-11-14 02:51:35,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:35,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2024-11-14 02:51:35,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=4627, Unknown=0, NotChecked=0, Total=5256 [2024-11-14 02:51:35,392 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 68 states, 68 states have (on average 1.1176470588235294) internal successors, (76), 68 states have internal predecessors, (76), 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) [2024-11-14 02:51:36,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:36,053 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2024-11-14 02:51:36,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 02:51:36,054 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.1176470588235294) internal successors, (76), 68 states have internal predecessors, (76), 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 45 [2024-11-14 02:51:36,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:36,055 INFO L225 Difference]: With dead ends: 64 [2024-11-14 02:51:36,055 INFO L226 Difference]: Without dead ends: 47 [2024-11-14 02:51:36,055 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 78 SyntacticMatches, 13 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2753 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=914, Invalid=6396, Unknown=0, NotChecked=0, Total=7310 [2024-11-14 02:51:36,056 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:36,057 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 35 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:51:36,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-14 02:51:36,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-14 02:51:36,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 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) [2024-11-14 02:51:36,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2024-11-14 02:51:36,087 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 45 [2024-11-14 02:51:36,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:36,087 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2024-11-14 02:51:36,088 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.1176470588235294) internal successors, (76), 68 states have internal predecessors, (76), 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) [2024-11-14 02:51:36,088 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2024-11-14 02:51:36,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-14 02:51:36,088 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:36,088 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:36,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2024-11-14 02:51:36,289 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2024-11-14 02:51:36,289 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:36,289 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:36,289 INFO L85 PathProgramCache]: Analyzing trace with hash -217666012, now seen corresponding path program 36 times [2024-11-14 02:51:36,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:36,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915772358] [2024-11-14 02:51:36,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:36,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:36,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:41,972 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 36 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:51:41,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:41,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915772358] [2024-11-14 02:51:41,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915772358] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:41,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807252285] [2024-11-14 02:51:41,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:51:41,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:41,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:41,975 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:41,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2024-11-14 02:51:42,176 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:51:42,176 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:51:42,179 INFO L255 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 138 conjuncts are in the unsatisfiable core [2024-11-14 02:51:42,181 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:42,780 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:51:45,230 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:51:45,230 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:50,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807252285] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:50,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1437158606] [2024-11-14 02:51:50,536 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:50,536 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:50,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:50,537 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:50,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:50,657 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:51,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12457#true' at error location [2024-11-14 02:51:51,374 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:51,374 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:51,374 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 31] total 104 [2024-11-14 02:51:51,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756071844] [2024-11-14 02:51:51,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:51,375 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2024-11-14 02:51:51,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:51,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2024-11-14 02:51:51,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=11066, Unknown=0, NotChecked=0, Total=11556 [2024-11-14 02:51:51,376 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 104 states, 104 states have (on average 1.0673076923076923) internal successors, (111), 104 states have internal predecessors, (111), 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) [2024-11-14 02:51:55,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:55,596 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2024-11-14 02:51:55,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2024-11-14 02:51:55,597 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.0673076923076923) internal successors, (111), 104 states have internal predecessors, (111), 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 46 [2024-11-14 02:51:55,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:55,597 INFO L225 Difference]: With dead ends: 65 [2024-11-14 02:51:55,597 INFO L226 Difference]: Without dead ends: 62 [2024-11-14 02:51:55,598 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3987 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=683, Invalid=14323, Unknown=0, NotChecked=0, Total=15006 [2024-11-14 02:51:55,598 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 2641 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 2643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 2641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:55,599 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 115 Invalid, 2643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 2641 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2024-11-14 02:51:55,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-14 02:51:55,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 49. [2024-11-14 02:51:55,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 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) [2024-11-14 02:51:55,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2024-11-14 02:51:55,633 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 46 [2024-11-14 02:51:55,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:55,634 INFO L471 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2024-11-14 02:51:55,634 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.0673076923076923) internal successors, (111), 104 states have internal predecessors, (111), 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) [2024-11-14 02:51:55,634 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2024-11-14 02:51:55,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2024-11-14 02:51:55,634 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:55,634 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:55,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2024-11-14 02:51:55,834 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2024-11-14 02:51:55,835 INFO L396 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:55,835 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:55,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1841531897, now seen corresponding path program 37 times [2024-11-14 02:51:55,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:55,835 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407316206] [2024-11-14 02:51:55,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:55,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:55,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:56,407 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:56,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:56,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407316206] [2024-11-14 02:51:56,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407316206] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:56,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884048648] [2024-11-14 02:51:56,408 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:51:56,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:56,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:56,411 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:56,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2024-11-14 02:51:56,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:56,620 INFO L255 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-14 02:51:56,621 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:51:57,178 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:57,179 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:51:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:51:57,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884048648] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:51:57,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923195625] [2024-11-14 02:51:57,591 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:51:57,591 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:51:57,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:51:57,592 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:51:57,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:51:57,710 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:51:57,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13080#true' at error location [2024-11-14 02:51:57,906 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:51:57,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:51:57,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2024-11-14 02:51:57,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772095030] [2024-11-14 02:51:57,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:51:57,907 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2024-11-14 02:51:57,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:51:57,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2024-11-14 02:51:57,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=2027, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 02:51:57,908 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 47 states have internal predecessors, (54), 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) [2024-11-14 02:51:58,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:51:58,109 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2024-11-14 02:51:58,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 02:51:58,109 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 47 states have internal predecessors, (54), 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 47 [2024-11-14 02:51:58,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:51:58,110 INFO L225 Difference]: With dead ends: 96 [2024-11-14 02:51:58,110 INFO L226 Difference]: Without dead ends: 50 [2024-11-14 02:51:58,110 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 94 SyntacticMatches, 27 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1528 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=523, Invalid=2027, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 02:51:58,110 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:51:58,110 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 02:51:58,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2024-11-14 02:51:58,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2024-11-14 02:51:58,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 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) [2024-11-14 02:51:58,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2024-11-14 02:51:58,147 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 47 [2024-11-14 02:51:58,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:51:58,148 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2024-11-14 02:51:58,148 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.148936170212766) internal successors, (54), 47 states have internal predecessors, (54), 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) [2024-11-14 02:51:58,148 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2024-11-14 02:51:58,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-14 02:51:58,148 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:51:58,148 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:51:58,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2024-11-14 02:51:58,349 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2024-11-14 02:51:58,349 INFO L396 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:51:58,349 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:51:58,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1300146528, now seen corresponding path program 38 times [2024-11-14 02:51:58,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:51:58,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861642534] [2024-11-14 02:51:58,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:51:58,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:51:58,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:51:58,819 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:51:58,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:51:58,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861642534] [2024-11-14 02:51:58,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861642534] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:51:58,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539688149] [2024-11-14 02:51:58,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:51:58,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:51:58,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:51:58,821 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:51:58,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2024-11-14 02:51:59,285 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-14 02:51:59,285 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:51:59,288 INFO L255 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-11-14 02:51:59,290 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:52:00,251 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 119 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 02:52:00,251 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:52:01,662 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:01,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539688149] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:52:01,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196926751] [2024-11-14 02:52:01,664 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:52:01,664 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:52:01,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:52:01,664 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:52:01,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:52:01,787 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:52:02,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14056#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:52:02,133 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:52:02,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:52:02,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 30] total 88 [2024-11-14 02:52:02,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796465904] [2024-11-14 02:52:02,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:52:02,134 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2024-11-14 02:52:02,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:52:02,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2024-11-14 02:52:02,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1245, Invalid=7311, Unknown=0, NotChecked=0, Total=8556 [2024-11-14 02:52:02,135 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 88 states, 88 states have (on average 1.0909090909090908) internal successors, (96), 88 states have internal predecessors, (96), 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) [2024-11-14 02:52:03,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:52:03,393 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2024-11-14 02:52:03,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 02:52:03,396 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.0909090909090908) internal successors, (96), 88 states have internal predecessors, (96), 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 48 [2024-11-14 02:52:03,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:52:03,397 INFO L225 Difference]: With dead ends: 68 [2024-11-14 02:52:03,397 INFO L226 Difference]: Without dead ends: 50 [2024-11-14 02:52:03,398 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4663 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1890, Invalid=12630, Unknown=0, NotChecked=0, Total=14520 [2024-11-14 02:52:03,399 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:52:03,399 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 35 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:52:03,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2024-11-14 02:52:03,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2024-11-14 02:52:03,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 49 states have internal predecessors, (52), 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) [2024-11-14 02:52:03,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2024-11-14 02:52:03,431 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 48 [2024-11-14 02:52:03,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:52:03,431 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2024-11-14 02:52:03,431 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.0909090909090908) internal successors, (96), 88 states have internal predecessors, (96), 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) [2024-11-14 02:52:03,431 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2024-11-14 02:52:03,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2024-11-14 02:52:03,432 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:52:03,432 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:52:03,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2024-11-14 02:52:03,632 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:03,632 INFO L396 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:52:03,632 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:52:03,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1385206219, now seen corresponding path program 39 times [2024-11-14 02:52:03,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:52:03,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241000003] [2024-11-14 02:52:03,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:52:03,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:52:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:52:09,897 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 29 proven. 286 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:52:09,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:52:09,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241000003] [2024-11-14 02:52:09,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241000003] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:52:09,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132296515] [2024-11-14 02:52:09,897 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:52:09,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:09,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:52:09,900 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:52:09,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2024-11-14 02:52:10,136 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:52:10,136 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:52:10,140 INFO L255 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 150 conjuncts are in the unsatisfiable core [2024-11-14 02:52:10,143 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:52:10,914 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:52:13,879 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:52:13,879 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:52:20,277 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:20,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132296515] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:52:20,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [388929858] [2024-11-14 02:52:20,279 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:52:20,279 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:52:20,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:52:20,279 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:52:20,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:52:20,394 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:52:21,287 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14740#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:52:21,287 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:52:21,287 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:52:21,288 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 33] total 112 [2024-11-14 02:52:21,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065525458] [2024-11-14 02:52:21,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:52:21,288 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2024-11-14 02:52:21,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:52:21,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2024-11-14 02:52:21,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=589, Invalid=12983, Unknown=0, NotChecked=0, Total=13572 [2024-11-14 02:52:21,290 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 112 states, 112 states have (on average 1.0625) internal successors, (119), 112 states have internal predecessors, (119), 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) [2024-11-14 02:52:26,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:52:26,626 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2024-11-14 02:52:26,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2024-11-14 02:52:26,627 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.0625) internal successors, (119), 112 states have internal predecessors, (119), 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 49 [2024-11-14 02:52:26,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:52:26,628 INFO L225 Difference]: With dead ends: 69 [2024-11-14 02:52:26,628 INFO L226 Difference]: Without dead ends: 66 [2024-11-14 02:52:26,628 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4616 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=819, Invalid=16737, Unknown=0, NotChecked=0, Total=17556 [2024-11-14 02:52:26,629 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 2974 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 2976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 2974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:52:26,629 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 121 Invalid, 2976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 2974 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2024-11-14 02:52:26,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2024-11-14 02:52:26,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 52. [2024-11-14 02:52:26,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 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) [2024-11-14 02:52:26,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2024-11-14 02:52:26,661 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 49 [2024-11-14 02:52:26,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:52:26,661 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2024-11-14 02:52:26,661 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.0625) internal successors, (119), 112 states have internal predecessors, (119), 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) [2024-11-14 02:52:26,661 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2024-11-14 02:52:26,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-14 02:52:26,661 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:52:26,662 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:52:26,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2024-11-14 02:52:26,862 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:26,862 INFO L396 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:52:26,862 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:52:26,862 INFO L85 PathProgramCache]: Analyzing trace with hash 7523848, now seen corresponding path program 40 times [2024-11-14 02:52:26,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:52:26,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487600328] [2024-11-14 02:52:26,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:52:26,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:52:26,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:52:27,405 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:27,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:52:27,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487600328] [2024-11-14 02:52:27,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487600328] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:52:27,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58907573] [2024-11-14 02:52:27,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:52:27,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:27,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:52:27,407 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:52:27,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2024-11-14 02:52:27,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:52:27,609 INFO L255 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-14 02:52:27,611 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:52:28,198 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:28,198 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:52:28,627 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:28,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58907573] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:52:28,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [793626479] [2024-11-14 02:52:28,628 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:52:28,628 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:52:28,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:52:28,629 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:52:28,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:52:28,794 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:52:28,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15006#true' at error location [2024-11-14 02:52:28,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:52:28,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:52:28,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2024-11-14 02:52:28,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894084203] [2024-11-14 02:52:28,995 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:52:28,995 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2024-11-14 02:52:28,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:52:28,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2024-11-14 02:52:28,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=589, Invalid=2273, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 02:52:28,996 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 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) [2024-11-14 02:52:29,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:52:29,322 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2024-11-14 02:52:29,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 02:52:29,322 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 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 50 [2024-11-14 02:52:29,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:52:29,323 INFO L225 Difference]: With dead ends: 102 [2024-11-14 02:52:29,323 INFO L226 Difference]: Without dead ends: 53 [2024-11-14 02:52:29,324 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 100 SyntacticMatches, 29 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1728 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=589, Invalid=2273, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 02:52:29,324 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:52:29,324 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:52:29,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-14 02:52:29,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2024-11-14 02:52:29,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 52 states have internal predecessors, (56), 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) [2024-11-14 02:52:29,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2024-11-14 02:52:29,364 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 50 [2024-11-14 02:52:29,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:52:29,365 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2024-11-14 02:52:29,365 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 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) [2024-11-14 02:52:29,365 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2024-11-14 02:52:29,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2024-11-14 02:52:29,365 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:52:29,365 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:52:29,385 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2024-11-14 02:52:29,565 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:29,566 INFO L396 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:52:29,566 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:52:29,566 INFO L85 PathProgramCache]: Analyzing trace with hash -801807551, now seen corresponding path program 41 times [2024-11-14 02:52:29,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:52:29,567 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21689297] [2024-11-14 02:52:29,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:52:29,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:52:29,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:52:30,289 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:52:30,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:52:30,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21689297] [2024-11-14 02:52:30,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21689297] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:52:30,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108338120] [2024-11-14 02:52:30,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:52:30,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:30,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:52:30,291 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:52:30,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2024-11-14 02:52:30,859 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-14 02:52:30,859 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:52:30,862 INFO L255 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 37 conjuncts are in the unsatisfiable core [2024-11-14 02:52:30,864 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:52:31,903 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 135 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 02:52:31,903 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:52:33,286 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:52:33,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108338120] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:52:33,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902794861] [2024-11-14 02:52:33,287 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:52:33,287 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:52:33,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:52:33,287 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:52:33,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:52:33,387 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:52:33,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15651#true' at error location [2024-11-14 02:52:33,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:52:33,643 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:52:33,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 32] total 94 [2024-11-14 02:52:33,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566436682] [2024-11-14 02:52:33,643 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:52:33,644 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2024-11-14 02:52:33,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:52:33,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2024-11-14 02:52:33,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1426, Invalid=8080, Unknown=0, NotChecked=0, Total=9506 [2024-11-14 02:52:33,646 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 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) [2024-11-14 02:52:34,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:52:34,843 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2024-11-14 02:52:34,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-14 02:52:34,844 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 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 51 [2024-11-14 02:52:34,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:52:34,845 INFO L225 Difference]: With dead ends: 72 [2024-11-14 02:52:34,845 INFO L226 Difference]: Without dead ends: 53 [2024-11-14 02:52:34,846 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5156 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2162, Invalid=14094, Unknown=0, NotChecked=0, Total=16256 [2024-11-14 02:52:34,846 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:52:34,847 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 39 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:52:34,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-14 02:52:34,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2024-11-14 02:52:34,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 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) [2024-11-14 02:52:34,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2024-11-14 02:52:34,884 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 51 [2024-11-14 02:52:34,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:52:34,884 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2024-11-14 02:52:34,884 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 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) [2024-11-14 02:52:34,884 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2024-11-14 02:52:34,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2024-11-14 02:52:34,884 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:52:34,884 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:52:34,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2024-11-14 02:52:35,085 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:35,085 INFO L396 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:52:35,085 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:52:35,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1339409284, now seen corresponding path program 42 times [2024-11-14 02:52:35,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:52:35,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366695560] [2024-11-14 02:52:35,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:52:35,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:52:35,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:52:42,006 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 55 proven. 305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:52:42,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:52:42,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366695560] [2024-11-14 02:52:42,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366695560] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:52:42,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363854069] [2024-11-14 02:52:42,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:52:42,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:52:42,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:52:42,009 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:52:42,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2024-11-14 02:52:42,250 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:52:42,250 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:52:42,254 INFO L255 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 158 conjuncts are in the unsatisfiable core [2024-11-14 02:52:42,256 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:52:43,137 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:52:46,424 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:52:46,424 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:52:54,264 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:52:54,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363854069] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:52:54,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711905066] [2024-11-14 02:52:54,266 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:52:54,266 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:52:54,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:52:54,266 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:52:54,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:52:54,405 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:52:55,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16346#true' at error location [2024-11-14 02:52:55,230 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:52:55,230 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:52:55,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 35] total 120 [2024-11-14 02:52:55,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42215164] [2024-11-14 02:52:55,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:52:55,231 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2024-11-14 02:52:55,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:52:55,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2024-11-14 02:52:55,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=14645, Unknown=0, NotChecked=0, Total=15252 [2024-11-14 02:52:55,233 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 120 states, 120 states have (on average 1.0583333333333333) internal successors, (127), 120 states have internal predecessors, (127), 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) [2024-11-14 02:53:00,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:00,503 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2024-11-14 02:53:00,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-14 02:53:00,504 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.0583333333333333) internal successors, (127), 120 states have internal predecessors, (127), 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 52 [2024-11-14 02:53:00,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:00,504 INFO L225 Difference]: With dead ends: 73 [2024-11-14 02:53:00,504 INFO L226 Difference]: Without dead ends: 70 [2024-11-14 02:53:00,505 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5346 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=843, Invalid=18897, Unknown=0, NotChecked=0, Total=19740 [2024-11-14 02:53:00,506 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 3026 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 3028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3026 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:00,506 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 113 Invalid, 3028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3026 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2024-11-14 02:53:00,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2024-11-14 02:53:00,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 55. [2024-11-14 02:53:00,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 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) [2024-11-14 02:53:00,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2024-11-14 02:53:00,544 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 52 [2024-11-14 02:53:00,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:00,544 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2024-11-14 02:53:00,544 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 1.0583333333333333) internal successors, (127), 120 states have internal predecessors, (127), 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) [2024-11-14 02:53:00,544 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2024-11-14 02:53:00,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2024-11-14 02:53:00,545 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:00,545 INFO L215 NwaCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:00,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2024-11-14 02:53:00,745 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:00,745 INFO L396 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:00,746 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:00,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1428741479, now seen corresponding path program 43 times [2024-11-14 02:53:00,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:00,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867575882] [2024-11-14 02:53:00,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:00,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:01,458 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:53:01,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:01,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867575882] [2024-11-14 02:53:01,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867575882] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:01,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084225433] [2024-11-14 02:53:01,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:53:01,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:01,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:01,460 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:01,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2024-11-14 02:53:01,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:01,729 INFO L255 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-14 02:53:01,731 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:02,391 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:53:02,391 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:53:02,869 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 02:53:02,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084225433] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:53:02,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [752055121] [2024-11-14 02:53:02,870 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:53:02,870 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:53:02,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:53:02,870 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:53:02,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:53:03,004 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:53:03,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17053#true' at error location [2024-11-14 02:53:03,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:53:03,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:53:03,230 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2024-11-14 02:53:03,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720827913] [2024-11-14 02:53:03,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:53:03,230 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2024-11-14 02:53:03,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:53:03,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2024-11-14 02:53:03,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=2533, Unknown=0, NotChecked=0, Total=3192 [2024-11-14 02:53:03,231 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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) [2024-11-14 02:53:03,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:03,550 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2024-11-14 02:53:03,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-14 02:53:03,550 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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 53 [2024-11-14 02:53:03,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:03,552 INFO L225 Difference]: With dead ends: 108 [2024-11-14 02:53:03,552 INFO L226 Difference]: Without dead ends: 56 [2024-11-14 02:53:03,552 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 106 SyntacticMatches, 31 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1940 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=659, Invalid=2533, Unknown=0, NotChecked=0, Total=3192 [2024-11-14 02:53:03,552 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:03,552 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:53:03,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-14 02:53:03,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2024-11-14 02:53:03,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 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) [2024-11-14 02:53:03,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2024-11-14 02:53:03,595 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 53 [2024-11-14 02:53:03,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:03,595 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2024-11-14 02:53:03,595 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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) [2024-11-14 02:53:03,595 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2024-11-14 02:53:03,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-11-14 02:53:03,595 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:03,596 INFO L215 NwaCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:03,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2024-11-14 02:53:03,796 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2024-11-14 02:53:03,796 INFO L396 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:03,796 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:03,796 INFO L85 PathProgramCache]: Analyzing trace with hash -274049344, now seen corresponding path program 44 times [2024-11-14 02:53:03,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:03,796 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760964884] [2024-11-14 02:53:03,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:03,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:03,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:04,552 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:04,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:04,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760964884] [2024-11-14 02:53:04,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760964884] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:04,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228793610] [2024-11-14 02:53:04,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:53:04,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:04,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:04,554 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:04,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2024-11-14 02:53:05,124 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-14 02:53:05,125 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:53:05,128 INFO L255 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-14 02:53:05,130 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:05,625 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:05,625 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:53:06,195 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:06,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228793610] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:53:06,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260494715] [2024-11-14 02:53:06,196 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:53:06,196 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:53:06,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:53:06,196 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:53:06,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:53:06,330 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:53:06,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17737#true' at error location [2024-11-14 02:53:06,521 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:53:06,521 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:53:06,521 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2024-11-14 02:53:06,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351841161] [2024-11-14 02:53:06,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:53:06,522 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2024-11-14 02:53:06,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:53:06,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2024-11-14 02:53:06,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=2533, Unknown=0, NotChecked=0, Total=3192 [2024-11-14 02:53:06,523 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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) [2024-11-14 02:53:06,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:06,821 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2024-11-14 02:53:06,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2024-11-14 02:53:06,822 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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 54 [2024-11-14 02:53:06,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:06,823 INFO L225 Difference]: With dead ends: 76 [2024-11-14 02:53:06,823 INFO L226 Difference]: Without dead ends: 56 [2024-11-14 02:53:06,823 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 108 SyntacticMatches, 32 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2316 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=678, Invalid=2628, Unknown=0, NotChecked=0, Total=3306 [2024-11-14 02:53:06,824 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:06,824 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 33 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:53:06,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-14 02:53:06,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2024-11-14 02:53:06,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 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) [2024-11-14 02:53:06,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2024-11-14 02:53:06,863 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 54 [2024-11-14 02:53:06,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:06,863 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2024-11-14 02:53:06,863 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 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) [2024-11-14 02:53:06,863 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2024-11-14 02:53:06,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-11-14 02:53:06,864 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:06,864 INFO L215 NwaCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:06,881 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2024-11-14 02:53:07,064 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2024-11-14 02:53:07,065 INFO L396 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:07,065 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:07,065 INFO L85 PathProgramCache]: Analyzing trace with hash 427019989, now seen corresponding path program 45 times [2024-11-14 02:53:07,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:07,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637552453] [2024-11-14 02:53:07,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:07,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:07,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:14,853 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 39 proven. 369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:53:14,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:14,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637552453] [2024-11-14 02:53:14,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637552453] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:14,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667608993] [2024-11-14 02:53:14,853 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:53:14,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:14,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:14,855 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:14,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2024-11-14 02:53:15,086 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:53:15,086 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:53:15,089 INFO L255 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 170 conjuncts are in the unsatisfiable core [2024-11-14 02:53:15,093 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:16,120 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:53:20,222 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:53:20,222 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:53:28,319 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:28,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667608993] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:53:28,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [827663769] [2024-11-14 02:53:28,320 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:53:28,320 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:53:28,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:53:28,320 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:53:28,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:53:28,446 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:53:29,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18365#true' at error location [2024-11-14 02:53:29,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:53:29,350 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:53:29,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 37] total 128 [2024-11-14 02:53:29,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274943984] [2024-11-14 02:53:29,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:53:29,350 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2024-11-14 02:53:29,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:53:29,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2024-11-14 02:53:29,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=643, Invalid=16649, Unknown=0, NotChecked=0, Total=17292 [2024-11-14 02:53:29,352 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 128 states, 128 states have (on average 1.0546875) internal successors, (135), 128 states have internal predecessors, (135), 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) [2024-11-14 02:53:36,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:36,290 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2024-11-14 02:53:36,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2024-11-14 02:53:36,290 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.0546875) internal successors, (135), 128 states have internal predecessors, (135), 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 55 [2024-11-14 02:53:36,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:36,291 INFO L225 Difference]: With dead ends: 77 [2024-11-14 02:53:36,291 INFO L226 Difference]: Without dead ends: 74 [2024-11-14 02:53:36,292 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5995 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=902, Invalid=21448, Unknown=0, NotChecked=0, Total=22350 [2024-11-14 02:53:36,293 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3929 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 3931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3929 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:36,293 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 143 Invalid, 3931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3929 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2024-11-14 02:53:36,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-14 02:53:36,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2024-11-14 02:53:36,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 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) [2024-11-14 02:53:36,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2024-11-14 02:53:36,338 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 55 [2024-11-14 02:53:36,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:36,338 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2024-11-14 02:53:36,338 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.0546875) internal successors, (135), 128 states have internal predecessors, (135), 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) [2024-11-14 02:53:36,339 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2024-11-14 02:53:36,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2024-11-14 02:53:36,339 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:36,339 INFO L215 NwaCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:36,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2024-11-14 02:53:36,539 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2024-11-14 02:53:36,539 INFO L396 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:36,540 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:36,540 INFO L85 PathProgramCache]: Analyzing trace with hash 351961448, now seen corresponding path program 46 times [2024-11-14 02:53:36,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:36,540 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663580094] [2024-11-14 02:53:36,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:36,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:36,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:37,336 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 137 proven. 152 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:37,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:37,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663580094] [2024-11-14 02:53:37,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663580094] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:37,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079505686] [2024-11-14 02:53:37,337 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:53:37,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:37,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:37,339 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:37,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2024-11-14 02:53:37,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:37,586 INFO L255 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-14 02:53:37,587 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:38,363 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:38,364 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:53:38,939 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-14 02:53:38,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079505686] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:53:38,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [235796680] [2024-11-14 02:53:38,940 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:53:38,940 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:53:38,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:53:38,940 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:53:38,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:53:39,038 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:53:39,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19500#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:53:39,268 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:53:39,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:53:39,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 56 [2024-11-14 02:53:39,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556643012] [2024-11-14 02:53:39,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:53:39,269 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2024-11-14 02:53:39,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:53:39,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2024-11-14 02:53:39,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=2940, Unknown=0, NotChecked=0, Total=3660 [2024-11-14 02:53:39,270 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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) [2024-11-14 02:53:39,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:39,569 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2024-11-14 02:53:39,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2024-11-14 02:53:39,570 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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 56 [2024-11-14 02:53:39,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:39,570 INFO L225 Difference]: With dead ends: 114 [2024-11-14 02:53:39,570 INFO L226 Difference]: Without dead ends: 59 [2024-11-14 02:53:39,571 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 111 SyntacticMatches, 33 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2201 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=720, Invalid=2940, Unknown=0, NotChecked=0, Total=3660 [2024-11-14 02:53:39,571 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:39,571 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:53:39,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-14 02:53:39,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-11-14 02:53:39,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 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) [2024-11-14 02:53:39,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2024-11-14 02:53:39,627 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 56 [2024-11-14 02:53:39,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:39,628 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2024-11-14 02:53:39,628 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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) [2024-11-14 02:53:39,628 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2024-11-14 02:53:39,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2024-11-14 02:53:39,628 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:39,628 INFO L215 NwaCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:39,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2024-11-14 02:53:39,828 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2024-11-14 02:53:39,829 INFO L396 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:39,829 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:39,829 INFO L85 PathProgramCache]: Analyzing trace with hash 1392281569, now seen corresponding path program 47 times [2024-11-14 02:53:39,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:39,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14558356] [2024-11-14 02:53:39,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:39,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:39,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:40,755 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:53:40,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:40,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14558356] [2024-11-14 02:53:40,756 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14558356] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:40,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920849135] [2024-11-14 02:53:40,756 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:53:40,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:40,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:40,759 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:40,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2024-11-14 02:53:41,403 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-14 02:53:41,403 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:53:41,407 INFO L255 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-14 02:53:41,408 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:41,948 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:53:41,948 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:53:42,552 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:53:42,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920849135] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:53:42,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [717571913] [2024-11-14 02:53:42,553 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:53:42,553 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:53:42,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:53:42,553 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:53:42,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:53:42,678 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:53:42,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20230#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:53:42,888 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:53:42,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:53:42,888 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 56 [2024-11-14 02:53:42,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98529807] [2024-11-14 02:53:42,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:53:42,888 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2024-11-14 02:53:42,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:53:42,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2024-11-14 02:53:42,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=737, Invalid=2923, Unknown=0, NotChecked=0, Total=3660 [2024-11-14 02:53:42,889 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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) [2024-11-14 02:53:43,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:53:43,239 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2024-11-14 02:53:43,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-14 02:53:43,239 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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 57 [2024-11-14 02:53:43,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:53:43,240 INFO L225 Difference]: With dead ends: 80 [2024-11-14 02:53:43,240 INFO L226 Difference]: Without dead ends: 59 [2024-11-14 02:53:43,240 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 34 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2662 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=757, Invalid=3025, Unknown=0, NotChecked=0, Total=3782 [2024-11-14 02:53:43,241 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:53:43,241 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 31 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:53:43,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-14 02:53:43,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-11-14 02:53:43,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 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) [2024-11-14 02:53:43,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2024-11-14 02:53:43,281 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 57 [2024-11-14 02:53:43,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:53:43,281 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2024-11-14 02:53:43,281 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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) [2024-11-14 02:53:43,281 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2024-11-14 02:53:43,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-11-14 02:53:43,281 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:53:43,282 INFO L215 NwaCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:53:43,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2024-11-14 02:53:43,482 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2024-11-14 02:53:43,482 INFO L396 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:53:43,482 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:53:43,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1954877668, now seen corresponding path program 48 times [2024-11-14 02:53:43,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:53:43,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694846906] [2024-11-14 02:53:43,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:53:43,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:53:43,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:53:52,557 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 78 proven. 381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:53:52,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:53:52,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694846906] [2024-11-14 02:53:52,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694846906] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:53:52,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559905119] [2024-11-14 02:53:52,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:53:52,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:53:52,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:53:52,560 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:53:52,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2024-11-14 02:53:52,799 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:53:52,799 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:53:52,802 INFO L255 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 178 conjuncts are in the unsatisfiable core [2024-11-14 02:53:52,805 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:53:53,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:53:58,415 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:53:58,415 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:54:08,756 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:54:08,756 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559905119] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:54:08,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1420538424] [2024-11-14 02:54:08,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:54:08,757 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:54:08,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:54:08,758 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:54:08,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:54:08,893 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:54:10,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20980#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:54:10,043 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:54:10,043 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:54:10,043 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 39] total 136 [2024-11-14 02:54:10,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216089407] [2024-11-14 02:54:10,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:54:10,044 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2024-11-14 02:54:10,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:54:10,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2024-11-14 02:54:10,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=804, Invalid=18936, Unknown=0, NotChecked=0, Total=19740 [2024-11-14 02:54:10,045 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 136 states, 136 states have (on average 1.0514705882352942) internal successors, (143), 136 states have internal predecessors, (143), 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) [2024-11-14 02:54:17,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:54:17,696 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2024-11-14 02:54:17,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2024-11-14 02:54:17,697 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.0514705882352942) internal successors, (143), 136 states have internal predecessors, (143), 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 58 [2024-11-14 02:54:17,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:54:17,698 INFO L225 Difference]: With dead ends: 81 [2024-11-14 02:54:17,698 INFO L226 Difference]: Without dead ends: 78 [2024-11-14 02:54:17,699 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6979 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=1106, Invalid=24334, Unknown=0, NotChecked=0, Total=25440 [2024-11-14 02:54:17,699 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 4490 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 4492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2024-11-14 02:54:17,700 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 153 Invalid, 4492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4490 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2024-11-14 02:54:17,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2024-11-14 02:54:17,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2024-11-14 02:54:17,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 60 states have internal predecessors, (64), 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) [2024-11-14 02:54:17,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2024-11-14 02:54:17,784 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 58 [2024-11-14 02:54:17,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:54:17,784 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2024-11-14 02:54:17,784 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.0514705882352942) internal successors, (143), 136 states have internal predecessors, (143), 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) [2024-11-14 02:54:17,784 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2024-11-14 02:54:17,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2024-11-14 02:54:17,784 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:54:17,785 INFO L215 NwaCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:54:17,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2024-11-14 02:54:17,985 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2024-11-14 02:54:17,985 INFO L396 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:54:17,985 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:54:17,986 INFO L85 PathProgramCache]: Analyzing trace with hash 470909241, now seen corresponding path program 49 times [2024-11-14 02:54:17,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:54:17,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074790276] [2024-11-14 02:54:17,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:54:17,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:54:18,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:54:18,877 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 154 proven. 170 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:54:18,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:54:18,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074790276] [2024-11-14 02:54:18,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074790276] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:54:18,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524898771] [2024-11-14 02:54:18,878 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:54:18,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:54:18,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:54:18,880 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:54:18,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2024-11-14 02:54:19,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:54:19,179 INFO L255 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-14 02:54:19,180 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:54:20,151 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:54:20,151 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:54:20,806 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 02:54:20,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524898771] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:54:20,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [660015361] [2024-11-14 02:54:20,807 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:54:20,807 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:54:20,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:54:20,807 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:54:20,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:54:20,929 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:54:21,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21294#true' at error location [2024-11-14 02:54:21,166 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:54:21,166 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:54:21,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 59 [2024-11-14 02:54:21,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075830765] [2024-11-14 02:54:21,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:54:21,167 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2024-11-14 02:54:21,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:54:21,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2024-11-14 02:54:21,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=811, Invalid=3095, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 02:54:21,168 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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) [2024-11-14 02:54:21,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:54:21,544 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2024-11-14 02:54:21,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-14 02:54:21,545 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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 59 [2024-11-14 02:54:21,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:54:21,546 INFO L225 Difference]: With dead ends: 120 [2024-11-14 02:54:21,546 INFO L226 Difference]: Without dead ends: 62 [2024-11-14 02:54:21,546 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 118 SyntacticMatches, 35 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2400 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=811, Invalid=3095, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 02:54:21,547 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:54:21,547 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:54:21,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-14 02:54:21,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2024-11-14 02:54:21,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 61 states have internal predecessors, (65), 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) [2024-11-14 02:54:21,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2024-11-14 02:54:21,607 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 59 [2024-11-14 02:54:21,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:54:21,607 INFO L471 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2024-11-14 02:54:21,608 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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) [2024-11-14 02:54:21,608 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2024-11-14 02:54:21,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-14 02:54:21,608 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:54:21,608 INFO L215 NwaCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:54:21,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2024-11-14 02:54:21,808 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2024-11-14 02:54:21,809 INFO L396 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:54:21,809 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:54:21,809 INFO L85 PathProgramCache]: Analyzing trace with hash 163626016, now seen corresponding path program 50 times [2024-11-14 02:54:21,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:54:21,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110085634] [2024-11-14 02:54:21,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:54:21,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:54:21,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:54:22,759 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:54:22,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:54:22,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110085634] [2024-11-14 02:54:22,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110085634] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:54:22,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478493709] [2024-11-14 02:54:22,760 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:54:22,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:54:22,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:54:22,762 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:54:22,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2024-11-14 02:54:23,352 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-14 02:54:23,352 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:54:23,356 INFO L255 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-14 02:54:23,358 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:54:23,863 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:54:23,863 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:54:24,508 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:54:24,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478493709] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:54:24,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338820804] [2024-11-14 02:54:24,509 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:54:24,509 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:54:24,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:54:24,510 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:54:24,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:54:24,628 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:54:24,829 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22056#true' at error location [2024-11-14 02:54:24,829 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:54:24,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:54:24,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 59 [2024-11-14 02:54:24,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272483432] [2024-11-14 02:54:24,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:54:24,832 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2024-11-14 02:54:24,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:54:24,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2024-11-14 02:54:24,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=811, Invalid=3095, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 02:54:24,833 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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) [2024-11-14 02:54:25,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:54:25,139 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2024-11-14 02:54:25,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2024-11-14 02:54:25,140 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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 60 [2024-11-14 02:54:25,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:54:25,141 INFO L225 Difference]: With dead ends: 84 [2024-11-14 02:54:25,141 INFO L226 Difference]: Without dead ends: 62 [2024-11-14 02:54:25,141 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 120 SyntacticMatches, 36 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2877 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=832, Invalid=3200, Unknown=0, NotChecked=0, Total=4032 [2024-11-14 02:54:25,142 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:54:25,142 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 21 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:54:25,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-14 02:54:25,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2024-11-14 02:54:25,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 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) [2024-11-14 02:54:25,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2024-11-14 02:54:25,225 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 60 [2024-11-14 02:54:25,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:54:25,225 INFO L471 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2024-11-14 02:54:25,226 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.11864406779661) internal successors, (66), 59 states have internal predecessors, (66), 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) [2024-11-14 02:54:25,226 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2024-11-14 02:54:25,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-14 02:54:25,226 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:54:25,226 INFO L215 NwaCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:54:25,270 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2024-11-14 02:54:25,426 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:54:25,427 INFO L396 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:54:25,427 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:54:25,427 INFO L85 PathProgramCache]: Analyzing trace with hash -975964299, now seen corresponding path program 51 times [2024-11-14 02:54:25,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:54:25,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771375193] [2024-11-14 02:54:25,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:54:25,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:54:25,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:54:35,735 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 91 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:54:35,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:54:35,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771375193] [2024-11-14 02:54:35,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771375193] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:54:35,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367824368] [2024-11-14 02:54:35,735 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:54:35,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:54:35,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:54:35,738 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:54:35,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2024-11-14 02:54:36,032 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:54:36,032 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:54:36,036 INFO L255 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 190 conjuncts are in the unsatisfiable core [2024-11-14 02:54:36,039 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:54:37,283 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:54:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:54:42,792 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:54:55,667 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:54:55,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367824368] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:54:55,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582853299] [2024-11-14 02:54:55,668 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:54:55,668 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:54:55,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:54:55,669 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:54:55,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:54:55,795 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:54:56,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22754#true' at error location [2024-11-14 02:54:56,774 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:54:56,774 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:54:56,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 41] total 144 [2024-11-14 02:54:56,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632387560] [2024-11-14 02:54:56,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:54:56,774 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2024-11-14 02:54:56,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:54:56,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2024-11-14 02:54:56,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=805, Invalid=20951, Unknown=0, NotChecked=0, Total=21756 [2024-11-14 02:54:56,776 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 144 states, 144 states have (on average 1.0486111111111112) internal successors, (151), 144 states have internal predecessors, (151), 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) [2024-11-14 02:55:05,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:55:05,604 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2024-11-14 02:55:05,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2024-11-14 02:55:05,604 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.0486111111111112) internal successors, (151), 144 states have internal predecessors, (151), 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 61 [2024-11-14 02:55:05,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:55:05,605 INFO L225 Difference]: With dead ends: 85 [2024-11-14 02:55:05,605 INFO L226 Difference]: Without dead ends: 82 [2024-11-14 02:55:05,606 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7752 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=1113, Invalid=26943, Unknown=0, NotChecked=0, Total=28056 [2024-11-14 02:55:05,607 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 4468 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 4470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2024-11-14 02:55:05,607 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 139 Invalid, 4470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4468 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2024-11-14 02:55:05,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2024-11-14 02:55:05,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 64. [2024-11-14 02:55:05,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 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) [2024-11-14 02:55:05,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2024-11-14 02:55:05,671 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 61 [2024-11-14 02:55:05,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:55:05,671 INFO L471 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2024-11-14 02:55:05,671 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.0486111111111112) internal successors, (151), 144 states have internal predecessors, (151), 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) [2024-11-14 02:55:05,671 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2024-11-14 02:55:05,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-14 02:55:05,672 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:55:05,672 INFO L215 NwaCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:55:05,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2024-11-14 02:55:05,872 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:55:05,873 INFO L396 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:55:05,873 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:55:05,873 INFO L85 PathProgramCache]: Analyzing trace with hash -190878520, now seen corresponding path program 52 times [2024-11-14 02:55:05,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:55:05,873 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124389061] [2024-11-14 02:55:05,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:55:05,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:55:05,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:55:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 189 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:55:06,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:55:06,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124389061] [2024-11-14 02:55:06,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124389061] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:55:06,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6817959] [2024-11-14 02:55:06,804 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:55:06,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:55:06,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:55:06,806 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:55:06,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2024-11-14 02:55:07,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:55:07,098 INFO L255 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 40 conjuncts are in the unsatisfiable core [2024-11-14 02:55:07,100 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:55:08,037 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:55:08,037 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:55:08,738 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2024-11-14 02:55:08,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6817959] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:55:08,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [146015930] [2024-11-14 02:55:08,739 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:55:08,739 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:55:08,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:55:08,740 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:55:08,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:55:08,867 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:55:09,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23587#true' at error location [2024-11-14 02:55:09,122 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:55:09,122 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:55:09,122 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 62 [2024-11-14 02:55:09,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218940202] [2024-11-14 02:55:09,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:55:09,122 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2024-11-14 02:55:09,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:55:09,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2024-11-14 02:55:09,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=893, Invalid=3397, Unknown=0, NotChecked=0, Total=4290 [2024-11-14 02:55:09,124 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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) [2024-11-14 02:55:09,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:55:09,675 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2024-11-14 02:55:09,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2024-11-14 02:55:09,675 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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 62 [2024-11-14 02:55:09,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:55:09,676 INFO L225 Difference]: With dead ends: 126 [2024-11-14 02:55:09,676 INFO L226 Difference]: Without dead ends: 65 [2024-11-14 02:55:09,677 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 124 SyntacticMatches, 37 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2648 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=893, Invalid=3397, Unknown=0, NotChecked=0, Total=4290 [2024-11-14 02:55:09,678 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:55:09,678 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 02:55:09,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2024-11-14 02:55:09,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2024-11-14 02:55:09,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.0625) internal successors, (68), 64 states have internal predecessors, (68), 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) [2024-11-14 02:55:09,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2024-11-14 02:55:09,756 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 62 [2024-11-14 02:55:09,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:55:09,756 INFO L471 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2024-11-14 02:55:09,756 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 62 states have internal predecessors, (69), 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) [2024-11-14 02:55:09,756 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2024-11-14 02:55:09,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2024-11-14 02:55:09,756 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:55:09,757 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:55:09,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2024-11-14 02:55:09,957 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2024-11-14 02:55:09,957 INFO L396 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:55:09,957 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:55:09,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1890126719, now seen corresponding path program 53 times [2024-11-14 02:55:09,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:55:09,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688782061] [2024-11-14 02:55:09,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:55:09,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:55:09,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:55:10,938 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 153 proven. 208 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:55:10,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:55:10,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688782061] [2024-11-14 02:55:10,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688782061] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:55:10,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102079531] [2024-11-14 02:55:10,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:55:10,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:55:10,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:55:10,940 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:55:10,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2024-11-14 02:55:12,110 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-14 02:55:12,110 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:55:12,116 INFO L255 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 40 conjuncts are in the unsatisfiable core [2024-11-14 02:55:12,117 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:55:13,592 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:55:13,592 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:55:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:55:15,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102079531] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:55:15,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1057843026] [2024-11-14 02:55:15,263 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:55:15,263 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:55:15,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:55:15,264 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:55:15,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:55:15,441 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:55:15,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24858#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:55:15,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:55:15,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:55:15,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 98 [2024-11-14 02:55:15,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146598765] [2024-11-14 02:55:15,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:55:15,876 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2024-11-14 02:55:15,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:55:15,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2024-11-14 02:55:15,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1253, Invalid=9253, Unknown=0, NotChecked=0, Total=10506 [2024-11-14 02:55:15,878 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand has 98 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 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) [2024-11-14 02:55:17,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:55:17,060 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2024-11-14 02:55:17,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-14 02:55:17,061 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 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 63 [2024-11-14 02:55:17,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:55:17,061 INFO L225 Difference]: With dead ends: 88 [2024-11-14 02:55:17,061 INFO L226 Difference]: Without dead ends: 65 [2024-11-14 02:55:17,062 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5798 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1841, Invalid=12921, Unknown=0, NotChecked=0, Total=14762 [2024-11-14 02:55:17,063 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:55:17,063 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 45 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:55:17,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2024-11-14 02:55:17,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2024-11-14 02:55:17,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 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) [2024-11-14 02:55:17,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2024-11-14 02:55:17,109 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 63 [2024-11-14 02:55:17,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:55:17,109 INFO L471 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2024-11-14 02:55:17,109 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 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) [2024-11-14 02:55:17,109 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2024-11-14 02:55:17,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-11-14 02:55:17,109 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:55:17,109 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:55:17,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2024-11-14 02:55:17,310 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2024-11-14 02:55:17,310 INFO L396 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:55:17,310 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:55:17,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1257597372, now seen corresponding path program 54 times [2024-11-14 02:55:17,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:55:17,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798209189] [2024-11-14 02:55:17,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:55:17,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:55:17,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:55:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 91 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:55:28,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:55:28,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798209189] [2024-11-14 02:55:28,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798209189] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:55:28,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291651731] [2024-11-14 02:55:28,661 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:55:28,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:55:28,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:55:28,662 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:55:28,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2024-11-14 02:55:28,959 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:55:28,959 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:55:28,964 INFO L255 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 198 conjuncts are in the unsatisfiable core [2024-11-14 02:55:28,967 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:55:30,561 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:55:36,096 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:55:36,096 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:55:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:55:49,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291651731] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:55:49,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133008724] [2024-11-14 02:55:49,003 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:55:49,003 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:55:49,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:55:49,003 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:55:49,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:55:49,108 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:55:50,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25194#true' at error location [2024-11-14 02:55:50,119 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:55:50,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:55:50,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 43] total 152 [2024-11-14 02:55:50,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857837836] [2024-11-14 02:55:50,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:55:50,120 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2024-11-14 02:55:50,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:55:50,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2024-11-14 02:55:50,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=23317, Unknown=0, NotChecked=0, Total=24180 [2024-11-14 02:55:50,122 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 152 states, 152 states have (on average 1.0460526315789473) internal successors, (159), 152 states have internal predecessors, (159), 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) [2024-11-14 02:55:59,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:55:59,163 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2024-11-14 02:55:59,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2024-11-14 02:55:59,164 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.0460526315789473) internal successors, (159), 152 states have internal predecessors, (159), 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 64 [2024-11-14 02:55:59,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:55:59,165 INFO L225 Difference]: With dead ends: 89 [2024-11-14 02:55:59,165 INFO L226 Difference]: Without dead ends: 86 [2024-11-14 02:55:59,166 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8511 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=1197, Invalid=29955, Unknown=0, NotChecked=0, Total=31152 [2024-11-14 02:55:59,166 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 4860 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 4864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 4860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2024-11-14 02:55:59,166 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 151 Invalid, 4864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 4860 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2024-11-14 02:55:59,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-11-14 02:55:59,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 67. [2024-11-14 02:55:59,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 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) [2024-11-14 02:55:59,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2024-11-14 02:55:59,227 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 64 [2024-11-14 02:55:59,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:55:59,227 INFO L471 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2024-11-14 02:55:59,227 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.0460526315789473) internal successors, (159), 152 states have internal predecessors, (159), 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) [2024-11-14 02:55:59,227 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2024-11-14 02:55:59,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2024-11-14 02:55:59,227 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:55:59,227 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:55:59,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2024-11-14 02:55:59,428 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:55:59,428 INFO L396 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:55:59,428 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:55:59,428 INFO L85 PathProgramCache]: Analyzing trace with hash -331569191, now seen corresponding path program 55 times [2024-11-14 02:55:59,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:55:59,428 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241188384] [2024-11-14 02:55:59,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:55:59,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:55:59,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:56:00,624 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 191 proven. 209 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:56:00,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:56:00,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241188384] [2024-11-14 02:56:00,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241188384] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:56:00,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384731957] [2024-11-14 02:56:00,624 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:56:00,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:56:00,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:56:00,626 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:56:00,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2024-11-14 02:56:00,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:56:00,977 INFO L255 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 42 conjuncts are in the unsatisfiable core [2024-11-14 02:56:00,980 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:56:01,996 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:56:01,996 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:56:02,774 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2024-11-14 02:56:02,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384731957] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:56:02,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069587990] [2024-11-14 02:56:02,776 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:56:02,776 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:56:02,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:56:02,776 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:56:02,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:56:02,894 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:56:03,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26518#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:56:03,178 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:56:03,178 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:56:03,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 65 [2024-11-14 02:56:03,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735704476] [2024-11-14 02:56:03,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:56:03,179 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2024-11-14 02:56:03,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:56:03,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2024-11-14 02:56:03,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3867, Unknown=0, NotChecked=0, Total=4830 [2024-11-14 02:56:03,179 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 states have internal predecessors, (72), 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) [2024-11-14 02:56:03,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:56:03,614 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2024-11-14 02:56:03,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-14 02:56:03,615 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 states have internal predecessors, (72), 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 65 [2024-11-14 02:56:03,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:56:03,616 INFO L225 Difference]: With dead ends: 132 [2024-11-14 02:56:03,616 INFO L226 Difference]: Without dead ends: 68 [2024-11-14 02:56:03,616 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 129 SyntacticMatches, 39 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2951 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=963, Invalid=3867, Unknown=0, NotChecked=0, Total=4830 [2024-11-14 02:56:03,617 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 02:56:03,617 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 02:56:03,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2024-11-14 02:56:03,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2024-11-14 02:56:03,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 67 states have internal predecessors, (71), 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) [2024-11-14 02:56:03,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2024-11-14 02:56:03,686 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 65 [2024-11-14 02:56:03,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:56:03,686 INFO L471 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2024-11-14 02:56:03,686 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 states have internal predecessors, (72), 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) [2024-11-14 02:56:03,686 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2024-11-14 02:56:03,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2024-11-14 02:56:03,687 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:56:03,687 INFO L215 NwaCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:56:03,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2024-11-14 02:56:03,887 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:56:03,887 INFO L396 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:56:03,887 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:56:03,888 INFO L85 PathProgramCache]: Analyzing trace with hash 2144852352, now seen corresponding path program 56 times [2024-11-14 02:56:03,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:56:03,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400632951] [2024-11-14 02:56:03,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:56:03,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:56:03,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:56:04,951 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 171 proven. 229 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:56:04,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:56:04,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400632951] [2024-11-14 02:56:04,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400632951] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:56:04,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526791010] [2024-11-14 02:56:04,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:56:04,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:56:04,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:56:04,954 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:56:04,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2024-11-14 02:56:05,675 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-14 02:56:05,675 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:56:05,682 INFO L255 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 42 conjuncts are in the unsatisfiable core [2024-11-14 02:56:05,683 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:56:07,458 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:56:07,459 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:56:09,186 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:56:09,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526791010] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:56:09,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549264135] [2024-11-14 02:56:09,187 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:56:09,187 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:56:09,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:56:09,187 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:56:09,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:56:09,309 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:56:09,699 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26910#true' at error location [2024-11-14 02:56:09,699 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:56:09,699 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:56:09,699 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2024-11-14 02:56:09,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887776448] [2024-11-14 02:56:09,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:56:09,700 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2024-11-14 02:56:09,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:56:09,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2024-11-14 02:56:09,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1394, Invalid=9948, Unknown=0, NotChecked=0, Total=11342 [2024-11-14 02:56:09,701 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 103 states, 103 states have (on average 1.0776699029126213) internal successors, (111), 103 states have internal predecessors, (111), 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) [2024-11-14 02:56:11,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:56:11,051 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2024-11-14 02:56:11,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 02:56:11,051 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.0776699029126213) internal successors, (111), 103 states have internal predecessors, (111), 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 66 [2024-11-14 02:56:11,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:56:11,052 INFO L225 Difference]: With dead ends: 92 [2024-11-14 02:56:11,052 INFO L226 Difference]: Without dead ends: 68 [2024-11-14 02:56:11,053 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 114 SyntacticMatches, 20 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6274 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=2043, Invalid=13959, Unknown=0, NotChecked=0, Total=16002 [2024-11-14 02:56:11,054 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 45 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:56:11,054 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 37 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:56:11,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2024-11-14 02:56:11,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2024-11-14 02:56:11,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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) [2024-11-14 02:56:11,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2024-11-14 02:56:11,116 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 66 [2024-11-14 02:56:11,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:56:11,116 INFO L471 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2024-11-14 02:56:11,116 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.0776699029126213) internal successors, (111), 103 states have internal predecessors, (111), 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) [2024-11-14 02:56:11,116 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2024-11-14 02:56:11,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2024-11-14 02:56:11,117 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:56:11,117 INFO L215 NwaCegarLoop]: trace histogram [20, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:56:11,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2024-11-14 02:56:11,317 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2024-11-14 02:56:11,317 INFO L396 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:56:11,318 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:56:11,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1398401045, now seen corresponding path program 57 times [2024-11-14 02:56:11,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:56:11,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479174116] [2024-11-14 02:56:11,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:56:11,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:56:11,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:56:23,753 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 120 proven. 510 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:56:23,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:56:23,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479174116] [2024-11-14 02:56:23,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479174116] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:56:23,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484099371] [2024-11-14 02:56:23,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:56:23,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:56:23,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:56:23,755 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:56:23,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2024-11-14 02:56:24,094 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:56:24,094 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:56:24,099 INFO L255 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 210 conjuncts are in the unsatisfiable core [2024-11-14 02:56:24,102 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:56:25,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:56:33,469 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:56:33,469 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:56:51,090 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:56:51,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484099371] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:56:51,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [889247534] [2024-11-14 02:56:51,091 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:56:51,091 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:56:51,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:56:51,091 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:56:51,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:56:51,203 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:56:52,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27754#true' at error location [2024-11-14 02:56:52,329 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:56:52,329 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:56:52,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 45] total 160 [2024-11-14 02:56:52,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928289187] [2024-11-14 02:56:52,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:56:52,330 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2024-11-14 02:56:52,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:56:52,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2024-11-14 02:56:52,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=25780, Unknown=0, NotChecked=0, Total=26732 [2024-11-14 02:56:52,333 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 160 states, 160 states have (on average 1.04375) internal successors, (167), 160 states have internal predecessors, (167), 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) [2024-11-14 02:57:03,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:57:03,573 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2024-11-14 02:57:03,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2024-11-14 02:57:03,574 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 1.04375) internal successors, (167), 160 states have internal predecessors, (167), 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 67 [2024-11-14 02:57:03,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:57:03,575 INFO L225 Difference]: With dead ends: 93 [2024-11-14 02:57:03,575 INFO L226 Difference]: Without dead ends: 90 [2024-11-14 02:57:03,576 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9601 ImplicationChecksByTransitivity, 35.2s TimeCoverageRelationStatistics Valid=1313, Invalid=33097, Unknown=0, NotChecked=0, Total=34410 [2024-11-14 02:57:03,576 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 5392 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 5394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2024-11-14 02:57:03,576 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 159 Invalid, 5394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5392 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2024-11-14 02:57:03,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2024-11-14 02:57:03,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 70. [2024-11-14 02:57:03,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 69 states have internal predecessors, (73), 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) [2024-11-14 02:57:03,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2024-11-14 02:57:03,666 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 67 [2024-11-14 02:57:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:57:03,666 INFO L471 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2024-11-14 02:57:03,666 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 1.04375) internal successors, (167), 160 states have internal predecessors, (167), 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) [2024-11-14 02:57:03,666 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2024-11-14 02:57:03,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2024-11-14 02:57:03,667 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:57:03,667 INFO L215 NwaCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:57:03,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2024-11-14 02:57:03,867 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2024-11-14 02:57:03,867 INFO L396 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:57:03,868 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:57:03,868 INFO L85 PathProgramCache]: Analyzing trace with hash 400003112, now seen corresponding path program 58 times [2024-11-14 02:57:03,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:57:03,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792416714] [2024-11-14 02:57:03,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:57:03,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:57:03,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:57:05,000 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 211 proven. 230 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:57:05,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:57:05,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792416714] [2024-11-14 02:57:05,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792416714] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:57:05,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953442518] [2024-11-14 02:57:05,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:57:05,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:57:05,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:57:05,002 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:57:05,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2024-11-14 02:57:05,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:57:05,366 INFO L255 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-11-14 02:57:05,367 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:57:06,472 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:57:06,472 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:57:07,284 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-14 02:57:07,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953442518] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:57:07,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154405205] [2024-11-14 02:57:07,285 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:57:07,285 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:57:07,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:57:07,285 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:57:07,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:57:07,395 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:57:07,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28671#true' at error location [2024-11-14 02:57:07,680 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:57:07,680 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:57:07,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 68 [2024-11-14 02:57:07,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080796578] [2024-11-14 02:57:07,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:57:07,681 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2024-11-14 02:57:07,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:57:07,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2024-11-14 02:57:07,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1069, Invalid=4043, Unknown=0, NotChecked=0, Total=5112 [2024-11-14 02:57:07,682 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 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) [2024-11-14 02:57:08,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:57:08,224 INFO L93 Difference]: Finished difference Result 138 states and 144 transitions. [2024-11-14 02:57:08,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 02:57:08,225 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 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 68 [2024-11-14 02:57:08,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:57:08,226 INFO L225 Difference]: With dead ends: 138 [2024-11-14 02:57:08,226 INFO L226 Difference]: Without dead ends: 71 [2024-11-14 02:57:08,226 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 136 SyntacticMatches, 41 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3180 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1069, Invalid=4043, Unknown=0, NotChecked=0, Total=5112 [2024-11-14 02:57:08,226 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:57:08,226 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 02:57:08,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2024-11-14 02:57:08,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2024-11-14 02:57:08,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 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) [2024-11-14 02:57:08,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2024-11-14 02:57:08,305 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 68 [2024-11-14 02:57:08,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:57:08,305 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2024-11-14 02:57:08,305 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 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) [2024-11-14 02:57:08,306 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2024-11-14 02:57:08,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-14 02:57:08,306 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:57:08,306 INFO L215 NwaCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:57:08,324 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2024-11-14 02:57:08,506 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2024-11-14 02:57:08,506 INFO L396 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:57:08,507 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:57:08,507 INFO L85 PathProgramCache]: Analyzing trace with hash 820947233, now seen corresponding path program 59 times [2024-11-14 02:57:08,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:57:08,507 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32520435] [2024-11-14 02:57:08,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:57:08,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:57:08,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:57:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 190 proven. 251 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:57:09,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:57:09,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32520435] [2024-11-14 02:57:09,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32520435] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:57:09,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162851701] [2024-11-14 02:57:09,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:57:09,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:57:09,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:57:09,817 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:57:09,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2024-11-14 02:57:10,930 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-14 02:57:10,930 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:57:10,936 INFO L255 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-11-14 02:57:10,938 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:57:12,738 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:57:12,738 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:57:14,636 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:57:14,636 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162851701] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:57:14,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516886971] [2024-11-14 02:57:14,637 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:57:14,637 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:57:14,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:57:14,637 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:57:14,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:57:14,741 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:57:15,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29550#true' at error location [2024-11-14 02:57:15,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:57:15,066 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:57:15,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 108 [2024-11-14 02:57:15,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370954912] [2024-11-14 02:57:15,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:57:15,067 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2024-11-14 02:57:15,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:57:15,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2024-11-14 02:57:15,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1526, Invalid=10906, Unknown=0, NotChecked=0, Total=12432 [2024-11-14 02:57:15,069 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand has 108 states, 108 states have (on average 1.0740740740740742) internal successors, (116), 108 states have internal predecessors, (116), 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) [2024-11-14 02:57:16,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:57:16,462 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2024-11-14 02:57:16,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2024-11-14 02:57:16,463 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.0740740740740742) internal successors, (116), 108 states have internal predecessors, (116), 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 69 [2024-11-14 02:57:16,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:57:16,464 INFO L225 Difference]: With dead ends: 96 [2024-11-14 02:57:16,464 INFO L226 Difference]: Without dead ends: 71 [2024-11-14 02:57:16,465 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 119 SyntacticMatches, 21 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6914 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2239, Invalid=15317, Unknown=0, NotChecked=0, Total=17556 [2024-11-14 02:57:16,465 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 47 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:57:16,465 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 35 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:57:16,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2024-11-14 02:57:16,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2024-11-14 02:57:16,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 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) [2024-11-14 02:57:16,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2024-11-14 02:57:16,534 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 69 [2024-11-14 02:57:16,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:57:16,535 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2024-11-14 02:57:16,535 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.0740740740740742) internal successors, (116), 108 states have internal predecessors, (116), 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) [2024-11-14 02:57:16,535 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2024-11-14 02:57:16,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2024-11-14 02:57:16,535 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:57:16,535 INFO L215 NwaCegarLoop]: trace histogram [21, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:57:16,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2024-11-14 02:57:16,736 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:57:16,736 INFO L396 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:57:16,736 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:57:16,736 INFO L85 PathProgramCache]: Analyzing trace with hash 484201380, now seen corresponding path program 60 times [2024-11-14 02:57:16,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:57:16,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296699609] [2024-11-14 02:57:16,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:57:16,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:57:16,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:57:30,377 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 136 proven. 557 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:57:30,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:57:30,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296699609] [2024-11-14 02:57:30,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296699609] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:57:30,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006128205] [2024-11-14 02:57:30,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:57:30,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:57:30,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:57:30,379 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:57:30,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2024-11-14 02:57:30,779 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:57:30,779 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:57:30,784 INFO L255 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 218 conjuncts are in the unsatisfiable core [2024-11-14 02:57:30,788 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:57:32,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:57:41,116 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:57:41,116 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:57:59,173 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:57:59,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006128205] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:57:59,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419698955] [2024-11-14 02:57:59,175 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:57:59,175 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:57:59,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:57:59,175 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:57:59,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:57:59,367 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:58:00,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30433#true' at error location [2024-11-14 02:58:00,695 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:58:00,695 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:58:00,696 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 47] total 168 [2024-11-14 02:58:00,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409913443] [2024-11-14 02:58:00,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:58:00,696 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2024-11-14 02:58:00,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:58:00,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2024-11-14 02:58:00,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1030, Invalid=28382, Unknown=0, NotChecked=0, Total=29412 [2024-11-14 02:58:00,699 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 168 states, 168 states have (on average 1.0416666666666667) internal successors, (175), 168 states have internal predecessors, (175), 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) [2024-11-14 02:58:14,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:58:14,258 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2024-11-14 02:58:14,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2024-11-14 02:58:14,259 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 1.0416666666666667) internal successors, (175), 168 states have internal predecessors, (175), 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 70 [2024-11-14 02:58:14,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:58:14,260 INFO L225 Difference]: With dead ends: 97 [2024-11-14 02:58:14,261 INFO L226 Difference]: Without dead ends: 94 [2024-11-14 02:58:14,262 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10599 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=1419, Invalid=36411, Unknown=0, NotChecked=0, Total=37830 [2024-11-14 02:58:14,263 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 5760 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 5762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2024-11-14 02:58:14,263 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 159 Invalid, 5762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5760 Invalid, 0 Unknown, 0 Unchecked, 8.7s Time] [2024-11-14 02:58:14,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2024-11-14 02:58:14,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 73. [2024-11-14 02:58:14,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 72 states have internal predecessors, (76), 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) [2024-11-14 02:58:14,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2024-11-14 02:58:14,391 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 70 [2024-11-14 02:58:14,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:58:14,391 INFO L471 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2024-11-14 02:58:14,391 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 1.0416666666666667) internal successors, (175), 168 states have internal predecessors, (175), 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) [2024-11-14 02:58:14,391 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2024-11-14 02:58:14,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2024-11-14 02:58:14,392 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:58:14,392 INFO L215 NwaCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:58:14,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2024-11-14 02:58:14,593 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:58:14,593 INFO L396 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:58:14,593 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:58:14,593 INFO L85 PathProgramCache]: Analyzing trace with hash 2124584569, now seen corresponding path program 61 times [2024-11-14 02:58:14,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:58:14,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150768167] [2024-11-14 02:58:14,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:58:14,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:58:14,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:58:16,066 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 232 proven. 252 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:58:16,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:58:16,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150768167] [2024-11-14 02:58:16,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150768167] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:58:16,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849785033] [2024-11-14 02:58:16,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:58:16,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:58:16,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:58:16,068 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:58:16,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2024-11-14 02:58:16,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:58:16,481 INFO L255 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-11-14 02:58:16,483 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:58:17,823 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:58:17,823 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:58:18,833 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2024-11-14 02:58:18,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849785033] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:58:18,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543215136] [2024-11-14 02:58:18,834 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:58:18,834 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:58:18,834 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:58:18,834 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:58:18,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:58:18,957 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:58:19,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31883#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:58:19,308 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:58:19,308 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:58:19,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 71 [2024-11-14 02:58:19,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948954492] [2024-11-14 02:58:19,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:58:19,309 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2024-11-14 02:58:19,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:58:19,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2024-11-14 02:58:19,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1145, Invalid=4555, Unknown=0, NotChecked=0, Total=5700 [2024-11-14 02:58:19,311 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 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) [2024-11-14 02:58:20,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:58:20,002 INFO L93 Difference]: Finished difference Result 144 states and 150 transitions. [2024-11-14 02:58:20,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2024-11-14 02:58:20,004 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 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 71 [2024-11-14 02:58:20,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:58:20,005 INFO L225 Difference]: With dead ends: 144 [2024-11-14 02:58:20,006 INFO L226 Difference]: Without dead ends: 74 [2024-11-14 02:58:20,006 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 141 SyntacticMatches, 43 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3511 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1145, Invalid=4555, Unknown=0, NotChecked=0, Total=5700 [2024-11-14 02:58:20,007 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:58:20,007 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:58:20,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-14 02:58:20,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2024-11-14 02:58:20,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 73 states have internal predecessors, (77), 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) [2024-11-14 02:58:20,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2024-11-14 02:58:20,105 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 71 [2024-11-14 02:58:20,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:58:20,105 INFO L471 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2024-11-14 02:58:20,105 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 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) [2024-11-14 02:58:20,105 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2024-11-14 02:58:20,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2024-11-14 02:58:20,106 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:58:20,106 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:58:20,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2024-11-14 02:58:20,306 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2024-11-14 02:58:20,306 INFO L396 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:58:20,307 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:58:20,307 INFO L85 PathProgramCache]: Analyzing trace with hash 1166388960, now seen corresponding path program 62 times [2024-11-14 02:58:20,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:58:20,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390497795] [2024-11-14 02:58:20,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:58:20,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:58:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:58:21,685 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 210 proven. 274 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:58:21,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:58:21,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390497795] [2024-11-14 02:58:21,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390497795] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:58:21,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754318970] [2024-11-14 02:58:21,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:58:21,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:58:21,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:58:21,688 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:58:21,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2024-11-14 02:58:22,620 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-14 02:58:22,620 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:58:22,626 INFO L255 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-11-14 02:58:22,627 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:58:24,830 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:58:24,830 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:58:27,228 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:58:27,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754318970] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:58:27,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1643183528] [2024-11-14 02:58:27,230 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:58:27,230 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:58:27,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:58:27,230 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:58:27,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:58:27,347 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:58:27,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32850#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 02:58:27,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:58:27,828 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:58:27,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2024-11-14 02:58:27,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666832434] [2024-11-14 02:58:27,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:58:27,828 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2024-11-14 02:58:27,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:58:27,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2024-11-14 02:58:27,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1646, Invalid=12160, Unknown=0, NotChecked=0, Total=13806 [2024-11-14 02:58:27,831 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 113 states, 113 states have (on average 1.0707964601769913) internal successors, (121), 113 states have internal predecessors, (121), 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) [2024-11-14 02:58:29,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:58:29,318 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2024-11-14 02:58:29,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2024-11-14 02:58:29,319 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.0707964601769913) internal successors, (121), 113 states have internal predecessors, (121), 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 72 [2024-11-14 02:58:29,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:58:29,320 INFO L225 Difference]: With dead ends: 100 [2024-11-14 02:58:29,320 INFO L226 Difference]: Without dead ends: 74 [2024-11-14 02:58:29,322 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7739 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=2426, Invalid=17034, Unknown=0, NotChecked=0, Total=19460 [2024-11-14 02:58:29,322 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 49 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:58:29,322 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 35 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 519 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:58:29,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-14 02:58:29,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2024-11-14 02:58:29,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 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) [2024-11-14 02:58:29,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2024-11-14 02:58:29,410 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 72 [2024-11-14 02:58:29,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:58:29,410 INFO L471 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2024-11-14 02:58:29,410 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.0707964601769913) internal successors, (121), 113 states have internal predecessors, (121), 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) [2024-11-14 02:58:29,411 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2024-11-14 02:58:29,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2024-11-14 02:58:29,411 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:58:29,411 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:58:29,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2024-11-14 02:58:29,612 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2024-11-14 02:58:29,612 INFO L396 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:58:29,612 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:58:29,612 INFO L85 PathProgramCache]: Analyzing trace with hash 995074229, now seen corresponding path program 63 times [2024-11-14 02:58:29,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:58:29,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731229741] [2024-11-14 02:58:29,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:58:29,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:58:29,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:58:45,620 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 153 proven. 606 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:58:45,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:58:45,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731229741] [2024-11-14 02:58:45,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731229741] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:58:45,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019314094] [2024-11-14 02:58:45,621 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 02:58:45,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:58:45,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:58:45,624 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:58:45,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2024-11-14 02:58:46,086 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 02:58:46,087 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:58:46,092 INFO L255 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 230 conjuncts are in the unsatisfiable core [2024-11-14 02:58:46,095 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:58:48,439 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 02:58:58,612 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 02:58:58,612 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:59:24,666 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:59:24,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019314094] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:59:24,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1432829298] [2024-11-14 02:59:24,668 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:59:24,668 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:59:24,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:59:24,668 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:59:24,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:59:24,793 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:59:26,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33234#true' at error location [2024-11-14 02:59:26,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:59:26,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:59:26,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 49] total 176 [2024-11-14 02:59:26,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142013595] [2024-11-14 02:59:26,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:59:26,314 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2024-11-14 02:59:26,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:59:26,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2024-11-14 02:59:26,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1111, Invalid=31109, Unknown=0, NotChecked=0, Total=32220 [2024-11-14 02:59:26,318 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 176 states have internal predecessors, (183), 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) [2024-11-14 02:59:44,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:59:44,100 INFO L93 Difference]: Finished difference Result 101 states and 104 transitions. [2024-11-14 02:59:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2024-11-14 02:59:44,101 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 176 states have internal predecessors, (183), 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 73 [2024-11-14 02:59:44,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:59:44,102 INFO L225 Difference]: With dead ends: 101 [2024-11-14 02:59:44,102 INFO L226 Difference]: Without dead ends: 98 [2024-11-14 02:59:44,104 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11646 ImplicationChecksByTransitivity, 50.3s TimeCoverageRelationStatistics Valid=1529, Invalid=39883, Unknown=0, NotChecked=0, Total=41412 [2024-11-14 02:59:44,105 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 6473 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 6475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 6473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2024-11-14 02:59:44,106 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 173 Invalid, 6475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6473 Invalid, 0 Unknown, 0 Unchecked, 11.3s Time] [2024-11-14 02:59:44,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2024-11-14 02:59:44,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 76. [2024-11-14 02:59:44,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 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) [2024-11-14 02:59:44,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2024-11-14 02:59:44,246 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 73 [2024-11-14 02:59:44,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:59:44,246 INFO L471 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2024-11-14 02:59:44,246 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 176 states have internal predecessors, (183), 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) [2024-11-14 02:59:44,246 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2024-11-14 02:59:44,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-14 02:59:44,247 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:59:44,247 INFO L215 NwaCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:59:44,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2024-11-14 02:59:44,447 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:59:44,448 INFO L396 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:59:44,448 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:59:44,448 INFO L85 PathProgramCache]: Analyzing trace with hash 781773704, now seen corresponding path program 64 times [2024-11-14 02:59:44,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:59:44,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115415556] [2024-11-14 02:59:44,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:59:44,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:59:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:59:46,319 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 254 proven. 275 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:59:46,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:59:46,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115415556] [2024-11-14 02:59:46,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115415556] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:59:46,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943186567] [2024-11-14 02:59:46,320 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 02:59:46,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:59:46,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:59:46,324 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:59:46,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2024-11-14 02:59:46,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:59:46,940 INFO L255 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 48 conjuncts are in the unsatisfiable core [2024-11-14 02:59:46,942 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:59:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:59:48,629 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 02:59:49,928 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:59:49,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943186567] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 02:59:49,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452503468] [2024-11-14 02:59:49,929 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 02:59:49,929 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 02:59:49,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 02:59:49,930 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 02:59:49,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 02:59:50,083 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 02:59:50,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34235#true' at error location [2024-11-14 02:59:50,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 02:59:50,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 02:59:50,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 74 [2024-11-14 02:59:50,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593891608] [2024-11-14 02:59:50,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 02:59:50,439 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2024-11-14 02:59:50,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 02:59:50,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2024-11-14 02:59:50,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=4745, Unknown=0, NotChecked=0, Total=6006 [2024-11-14 02:59:50,441 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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) [2024-11-14 02:59:51,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 02:59:51,170 INFO L93 Difference]: Finished difference Result 150 states and 156 transitions. [2024-11-14 02:59:51,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2024-11-14 02:59:51,170 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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 74 [2024-11-14 02:59:51,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 02:59:51,171 INFO L225 Difference]: With dead ends: 150 [2024-11-14 02:59:51,171 INFO L226 Difference]: Without dead ends: 77 [2024-11-14 02:59:51,172 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 45 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3760 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1261, Invalid=4745, Unknown=0, NotChecked=0, Total=6006 [2024-11-14 02:59:51,173 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 02:59:51,173 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 02:59:51,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2024-11-14 02:59:51,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2024-11-14 02:59:51,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 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) [2024-11-14 02:59:51,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2024-11-14 02:59:51,330 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 74 [2024-11-14 02:59:51,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 02:59:51,331 INFO L471 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2024-11-14 02:59:51,331 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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) [2024-11-14 02:59:51,331 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2024-11-14 02:59:51,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2024-11-14 02:59:51,331 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 02:59:51,331 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 02:59:51,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2024-11-14 02:59:51,532 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:59:51,532 INFO L396 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 02:59:51,532 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 02:59:51,533 INFO L85 PathProgramCache]: Analyzing trace with hash -470964799, now seen corresponding path program 65 times [2024-11-14 02:59:51,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 02:59:51,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551877175] [2024-11-14 02:59:51,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 02:59:51,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 02:59:51,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 02:59:53,425 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 231 proven. 298 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 02:59:53,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 02:59:53,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551877175] [2024-11-14 02:59:53,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551877175] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 02:59:53,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592064743] [2024-11-14 02:59:53,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 02:59:53,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 02:59:53,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 02:59:53,427 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 02:59:53,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2024-11-14 02:59:55,638 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-14 02:59:55,638 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 02:59:55,646 INFO L255 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 55 conjuncts are in the unsatisfiable core [2024-11-14 02:59:55,648 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 02:59:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 299 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2024-11-14 02:59:58,489 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:00:02,661 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 231 proven. 298 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:00:02,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592064743] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:00:02,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182700651] [2024-11-14 03:00:02,662 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:00:02,662 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:00:02,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:00:02,663 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:00:02,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:00:02,801 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:00:03,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35192#true' at error location [2024-11-14 03:00:03,308 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:00:03,309 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:00:03,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 142 [2024-11-14 03:00:03,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820089948] [2024-11-14 03:00:03,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:00:03,309 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2024-11-14 03:00:03,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:00:03,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2024-11-14 03:00:03,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3190, Invalid=17980, Unknown=0, NotChecked=0, Total=21170 [2024-11-14 03:00:03,313 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand has 142 states, 142 states have (on average 1.0633802816901408) internal successors, (151), 142 states have internal predecessors, (151), 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) [2024-11-14 03:00:06,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:00:06,706 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2024-11-14 03:00:06,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2024-11-14 03:00:06,707 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 1.0633802816901408) internal successors, (151), 142 states have internal predecessors, (151), 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 75 [2024-11-14 03:00:06,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:00:06,708 INFO L225 Difference]: With dead ends: 104 [2024-11-14 03:00:06,708 INFO L226 Difference]: Without dead ends: 77 [2024-11-14 03:00:06,712 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12075 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=4891, Invalid=31781, Unknown=0, NotChecked=0, Total=36672 [2024-11-14 03:00:06,712 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 51 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 03:00:06,713 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 43 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 03:00:06,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2024-11-14 03:00:06,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2024-11-14 03:00:06,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 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) [2024-11-14 03:00:06,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2024-11-14 03:00:06,883 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 75 [2024-11-14 03:00:06,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:00:06,884 INFO L471 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2024-11-14 03:00:06,884 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 142 states, 142 states have (on average 1.0633802816901408) internal successors, (151), 142 states have internal predecessors, (151), 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) [2024-11-14 03:00:06,884 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2024-11-14 03:00:06,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2024-11-14 03:00:06,885 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:00:06,885 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 23, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:00:06,909 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2024-11-14 03:00:07,085 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2024-11-14 03:00:07,086 INFO L396 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:00:07,086 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:00:07,086 INFO L85 PathProgramCache]: Analyzing trace with hash -823113468, now seen corresponding path program 66 times [2024-11-14 03:00:07,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:00:07,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882461443] [2024-11-14 03:00:07,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:00:07,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:00:07,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:00:23,585 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 171 proven. 657 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:00:23,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:00:23,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882461443] [2024-11-14 03:00:23,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882461443] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:00:23,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657892678] [2024-11-14 03:00:23,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:00:23,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:00:23,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:00:23,588 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:00:23,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2024-11-14 03:00:24,071 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:00:24,071 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:00:24,076 INFO L255 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 238 conjuncts are in the unsatisfiable core [2024-11-14 03:00:24,080 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:00:26,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:00:39,355 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:00:39,356 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:01:06,581 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:01:06,581 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657892678] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:01:06,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378602441] [2024-11-14 03:01:06,583 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:01:06,583 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:01:06,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:01:06,583 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:01:06,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:01:06,719 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:01:08,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36223#true' at error location [2024-11-14 03:01:08,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:01:08,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:01:08,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 51] total 184 [2024-11-14 03:01:08,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101998886] [2024-11-14 03:01:08,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:01:08,413 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2024-11-14 03:01:08,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:01:08,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2024-11-14 03:01:08,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1195, Invalid=33961, Unknown=0, NotChecked=0, Total=35156 [2024-11-14 03:01:08,415 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 184 states, 184 states have (on average 1.0380434782608696) internal successors, (191), 184 states have internal predecessors, (191), 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) [2024-11-14 03:01:24,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:01:24,638 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2024-11-14 03:01:24,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2024-11-14 03:01:24,639 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 1.0380434782608696) internal successors, (191), 184 states have internal predecessors, (191), 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 76 [2024-11-14 03:01:24,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:01:24,640 INFO L225 Difference]: With dead ends: 105 [2024-11-14 03:01:24,640 INFO L226 Difference]: Without dead ends: 102 [2024-11-14 03:01:24,642 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12742 ImplicationChecksByTransitivity, 53.7s TimeCoverageRelationStatistics Valid=1643, Invalid=43513, Unknown=0, NotChecked=0, Total=45156 [2024-11-14 03:01:24,642 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 7413 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 7415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2024-11-14 03:01:24,643 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 191 Invalid, 7415 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2 Valid, 7413 Invalid, 0 Unknown, 0 Unchecked, 10.9s Time] [2024-11-14 03:01:24,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2024-11-14 03:01:24,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 79. [2024-11-14 03:01:24,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 78 states have internal predecessors, (82), 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) [2024-11-14 03:01:24,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2024-11-14 03:01:24,764 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 76 [2024-11-14 03:01:24,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:01:24,764 INFO L471 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2024-11-14 03:01:24,764 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 1.0380434782608696) internal successors, (191), 184 states have internal predecessors, (191), 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) [2024-11-14 03:01:24,764 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2024-11-14 03:01:24,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2024-11-14 03:01:24,765 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:01:24,765 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:01:24,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2024-11-14 03:01:24,965 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2024-11-14 03:01:24,966 INFO L396 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:01:24,966 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:01:24,966 INFO L85 PathProgramCache]: Analyzing trace with hash 252529945, now seen corresponding path program 67 times [2024-11-14 03:01:24,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:01:24,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024573204] [2024-11-14 03:01:24,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:01:24,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:01:25,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:01:26,463 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 277 proven. 299 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:01:26,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:01:26,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024573204] [2024-11-14 03:01:26,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024573204] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:01:26,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236385235] [2024-11-14 03:01:26,464 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:01:26,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:01:26,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:01:26,466 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:01:26,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2024-11-14 03:01:26,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:01:26,957 INFO L255 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-14 03:01:26,959 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:01:28,288 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:01:28,288 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:01:29,438 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:01:29,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236385235] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:01:29,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1378165705] [2024-11-14 03:01:29,439 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:01:29,440 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:01:29,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:01:29,440 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:01:29,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:01:29,634 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:01:30,086 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37799#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:01:30,086 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:01:30,086 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:01:30,086 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 77 [2024-11-14 03:01:30,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824296935] [2024-11-14 03:01:30,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:01:30,087 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2024-11-14 03:01:30,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:01:30,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2024-11-14 03:01:30,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1343, Invalid=5299, Unknown=0, NotChecked=0, Total=6642 [2024-11-14 03:01:30,088 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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) [2024-11-14 03:01:30,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:01:30,777 INFO L93 Difference]: Finished difference Result 156 states and 162 transitions. [2024-11-14 03:01:30,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2024-11-14 03:01:30,778 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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 77 [2024-11-14 03:01:30,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:01:30,779 INFO L225 Difference]: With dead ends: 156 [2024-11-14 03:01:30,779 INFO L226 Difference]: Without dead ends: 80 [2024-11-14 03:01:30,780 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 153 SyntacticMatches, 47 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4119 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1343, Invalid=5299, Unknown=0, NotChecked=0, Total=6642 [2024-11-14 03:01:30,780 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:01:30,780 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:01:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2024-11-14 03:01:30,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2024-11-14 03:01:30,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 79 states have internal predecessors, (83), 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) [2024-11-14 03:01:30,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2024-11-14 03:01:30,987 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 77 [2024-11-14 03:01:30,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:01:30,987 INFO L471 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2024-11-14 03:01:30,987 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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) [2024-11-14 03:01:30,988 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2024-11-14 03:01:30,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2024-11-14 03:01:30,988 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:01:30,988 INFO L215 NwaCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:01:31,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2024-11-14 03:01:31,189 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2024-11-14 03:01:31,189 INFO L396 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:01:31,189 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:01:31,190 INFO L85 PathProgramCache]: Analyzing trace with hash -1109377984, now seen corresponding path program 68 times [2024-11-14 03:01:31,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:01:31,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682605258] [2024-11-14 03:01:31,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:01:31,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:01:31,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:01:32,747 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 253 proven. 323 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:01:32,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:01:32,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682605258] [2024-11-14 03:01:32,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682605258] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:01:32,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321857968] [2024-11-14 03:01:32,747 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:01:32,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:01:32,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:01:32,750 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:01:32,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2024-11-14 03:01:34,275 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-14 03:01:34,275 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:01:34,285 INFO L255 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-14 03:01:34,287 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:01:35,314 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:01:35,315 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:01:36,508 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:01:36,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321857968] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:01:36,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1668525813] [2024-11-14 03:01:36,509 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:01:36,510 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:01:36,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:01:36,510 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:01:36,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:01:36,623 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:01:36,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38802#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:01:36,890 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:01:36,890 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:01:36,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 77 [2024-11-14 03:01:36,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214748433] [2024-11-14 03:01:36,890 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:01:36,890 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2024-11-14 03:01:36,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:01:36,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2024-11-14 03:01:36,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=5275, Unknown=0, NotChecked=0, Total=6642 [2024-11-14 03:01:36,891 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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) [2024-11-14 03:01:37,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:01:37,420 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2024-11-14 03:01:37,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2024-11-14 03:01:37,421 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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 78 [2024-11-14 03:01:37,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:01:37,422 INFO L225 Difference]: With dead ends: 108 [2024-11-14 03:01:37,422 INFO L226 Difference]: Without dead ends: 80 [2024-11-14 03:01:37,422 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 155 SyntacticMatches, 48 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5021 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1394, Invalid=5412, Unknown=0, NotChecked=0, Total=6806 [2024-11-14 03:01:37,423 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:01:37,423 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 27 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 03:01:37,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2024-11-14 03:01:37,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2024-11-14 03:01:37,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 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) [2024-11-14 03:01:37,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2024-11-14 03:01:37,535 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 78 [2024-11-14 03:01:37,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:01:37,535 INFO L471 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2024-11-14 03:01:37,535 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 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) [2024-11-14 03:01:37,535 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2024-11-14 03:01:37,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2024-11-14 03:01:37,536 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:01:37,536 INFO L215 NwaCegarLoop]: trace histogram [24, 24, 24, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:01:37,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2024-11-14 03:01:37,736 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2024-11-14 03:01:37,737 INFO L396 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:01:37,737 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:01:37,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1870602581, now seen corresponding path program 69 times [2024-11-14 03:01:37,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:01:37,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46190851] [2024-11-14 03:01:37,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:01:37,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:01:38,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:01:57,313 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 190 proven. 710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:01:57,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:01:57,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46190851] [2024-11-14 03:01:57,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46190851] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:01:57,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053073604] [2024-11-14 03:01:57,314 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:01:57,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:01:57,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:01:57,315 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:01:57,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2024-11-14 03:01:57,803 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:01:57,803 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:01:57,809 INFO L255 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 250 conjuncts are in the unsatisfiable core [2024-11-14 03:01:57,812 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:02:00,466 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:02:12,372 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:02:12,372 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:02:41,732 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:02:41,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053073604] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:02:41,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978225838] [2024-11-14 03:02:41,733 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:02:41,733 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:02:41,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:02:41,733 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:02:41,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:02:41,861 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:02:43,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39172#true' at error location [2024-11-14 03:02:43,507 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:02:43,507 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:02:43,507 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 53] total 192 [2024-11-14 03:02:43,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279588509] [2024-11-14 03:02:43,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:02:43,507 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2024-11-14 03:02:43,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:02:43,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2024-11-14 03:02:43,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1282, Invalid=36938, Unknown=0, NotChecked=0, Total=38220 [2024-11-14 03:02:43,510 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 192 states, 192 states have (on average 1.0364583333333333) internal successors, (199), 192 states have internal predecessors, (199), 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) [2024-11-14 03:03:02,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:03:02,108 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2024-11-14 03:03:02,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2024-11-14 03:03:02,109 INFO L78 Accepts]: Start accepts. Automaton has has 192 states, 192 states have (on average 1.0364583333333333) internal successors, (199), 192 states have internal predecessors, (199), 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 79 [2024-11-14 03:03:02,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:03:02,110 INFO L225 Difference]: With dead ends: 109 [2024-11-14 03:03:02,110 INFO L226 Difference]: Without dead ends: 106 [2024-11-14 03:03:02,111 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13887 ImplicationChecksByTransitivity, 56.3s TimeCoverageRelationStatistics Valid=1761, Invalid=47301, Unknown=0, NotChecked=0, Total=49062 [2024-11-14 03:03:02,112 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 7830 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 7832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:03:02,112 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 193 Invalid, 7832 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2 Valid, 7830 Invalid, 0 Unknown, 0 Unchecked, 12.2s Time] [2024-11-14 03:03:02,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2024-11-14 03:03:02,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 82. [2024-11-14 03:03:02,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 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) [2024-11-14 03:03:02,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2024-11-14 03:03:02,310 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 79 [2024-11-14 03:03:02,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:03:02,311 INFO L471 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2024-11-14 03:03:02,311 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 192 states, 192 states have (on average 1.0364583333333333) internal successors, (199), 192 states have internal predecessors, (199), 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) [2024-11-14 03:03:02,311 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2024-11-14 03:03:02,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2024-11-14 03:03:02,311 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:03:02,311 INFO L215 NwaCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:03:02,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2024-11-14 03:03:02,512 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:03:02,512 INFO L396 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:03:02,513 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:03:02,513 INFO L85 PathProgramCache]: Analyzing trace with hash -2141618456, now seen corresponding path program 70 times [2024-11-14 03:03:02,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:03:02,513 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530487540] [2024-11-14 03:03:02,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:03:02,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:03:02,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:03:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 301 proven. 324 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:03:04,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:03:04,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530487540] [2024-11-14 03:03:04,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530487540] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:03:04,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631473832] [2024-11-14 03:03:04,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:03:04,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:03:04,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:03:04,211 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:03:04,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2024-11-14 03:03:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:03:04,708 INFO L255 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-14 03:03:04,710 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:03:06,243 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:03:06,243 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:03:07,466 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:03:07,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631473832] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:03:07,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738014727] [2024-11-14 03:03:07,468 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-14 03:03:07,468 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:03:07,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:03:07,468 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:03:07,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:03:07,600 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:03:07,914 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40257#true' at error location [2024-11-14 03:03:07,914 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:03:07,914 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:03:07,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 80 [2024-11-14 03:03:07,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472710618] [2024-11-14 03:03:07,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:03:07,915 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2024-11-14 03:03:07,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:03:07,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2024-11-14 03:03:07,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1469, Invalid=5503, Unknown=0, NotChecked=0, Total=6972 [2024-11-14 03:03:07,917 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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) [2024-11-14 03:03:08,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:03:08,617 INFO L93 Difference]: Finished difference Result 162 states and 168 transitions. [2024-11-14 03:03:08,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2024-11-14 03:03:08,618 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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 80 [2024-11-14 03:03:08,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:03:08,619 INFO L225 Difference]: With dead ends: 162 [2024-11-14 03:03:08,619 INFO L226 Difference]: Without dead ends: 83 [2024-11-14 03:03:08,620 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 160 SyntacticMatches, 49 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4388 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1469, Invalid=5503, Unknown=0, NotChecked=0, Total=6972 [2024-11-14 03:03:08,620 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:03:08,620 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 03:03:08,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2024-11-14 03:03:08,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2024-11-14 03:03:08,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.048780487804878) internal successors, (86), 82 states have internal predecessors, (86), 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) [2024-11-14 03:03:08,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2024-11-14 03:03:08,853 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 80 [2024-11-14 03:03:08,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:03:08,853 INFO L471 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2024-11-14 03:03:08,853 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.0875) internal successors, (87), 80 states have internal predecessors, (87), 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) [2024-11-14 03:03:08,853 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2024-11-14 03:03:08,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2024-11-14 03:03:08,854 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:03:08,854 INFO L215 NwaCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:03:08,881 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2024-11-14 03:03:09,054 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:03:09,055 INFO L396 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:03:09,055 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:03:09,055 INFO L85 PathProgramCache]: Analyzing trace with hash -184685983, now seen corresponding path program 71 times [2024-11-14 03:03:09,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:03:09,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427277574] [2024-11-14 03:03:09,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:03:09,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:03:09,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:03:10,875 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 276 proven. 349 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2024-11-14 03:03:10,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:03:10,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427277574] [2024-11-14 03:03:10,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427277574] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:03:10,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670374353] [2024-11-14 03:03:10,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:03:10,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:03:10,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:03:10,877 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:03:10,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_795de581-a948-4fe2-8899-0ee91567c5a7/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2024-11-14 03:03:13,080 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2024-11-14 03:03:13,080 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:03:13,089 INFO L255 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 57 conjuncts are in the unsatisfiable core [2024-11-14 03:03:13,090 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:03:15,913 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 350 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2024-11-14 03:03:15,913 INFO L311 TraceCheckSpWp]: Computing backward predicates...