./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ --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 8828f6ff39cd2bcfba4fe3d04f0119d60137bcad91eabef2e2b840cbd0802b98 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:55:30,829 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:55:30,944 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:55:30,952 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:55:30,952 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:55:30,990 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:55:30,991 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:55:30,992 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:55:30,993 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:55:30,997 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:55:30,998 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:55:30,999 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:55:30,999 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:55:31,001 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:55:31,001 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:55:31,002 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:55:31,002 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:55:31,003 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:55:31,004 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:55:31,005 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:55:31,005 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:55:31,006 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:55:31,007 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:55:31,007 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:55:31,008 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:55:31,008 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:55:31,022 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:55:31,022 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:55:31,023 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:55:31,023 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:55:31,024 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:55:31,025 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:55:31,025 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:55:31,025 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:55:31,025 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:55:31,026 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:55:31,026 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:55:31,026 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:55:31,027 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:55:31,027 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:55:31,027 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:55:31,028 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:55:31,028 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:55:31,028 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:55:31,029 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:55:31,029 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8828f6ff39cd2bcfba4fe3d04f0119d60137bcad91eabef2e2b840cbd0802b98 [2023-11-19 04:55:31,375 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:55:31,406 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:55:31,408 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:55:31,410 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:55:31,410 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:55:31,411 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loop-acceleration/nested_1-2.c [2023-11-19 04:55:34,506 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:55:34,725 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:55:34,726 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/sv-benchmarks/c/loop-acceleration/nested_1-2.c [2023-11-19 04:55:34,733 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/data/f47e59f05/40b19d50ea0c4227be95bbc23b3bd28e/FLAGf7b1dafce [2023-11-19 04:55:34,747 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/data/f47e59f05/40b19d50ea0c4227be95bbc23b3bd28e [2023-11-19 04:55:34,750 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:55:34,751 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:55:34,753 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:55:34,753 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:55:34,758 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:55:34,759 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,760 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38f0df76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34, skipping insertion in model container [2023-11-19 04:55:34,760 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,780 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:55:34,910 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/sv-benchmarks/c/loop-acceleration/nested_1-2.c[322,335] [2023-11-19 04:55:34,923 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:55:34,931 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:55:34,941 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/sv-benchmarks/c/loop-acceleration/nested_1-2.c[322,335] [2023-11-19 04:55:34,944 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:55:34,956 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:55:34,957 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34 WrapperNode [2023-11-19 04:55:34,957 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:55:34,958 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:55:34,958 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:55:34,958 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:55:34,965 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,970 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,984 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 33 [2023-11-19 04:55:34,984 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:55:34,985 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:55:34,985 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:55:34,985 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:55:34,994 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,994 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,995 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,996 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:34,998 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:35,001 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:35,002 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:35,003 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:35,004 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:55:35,005 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:55:35,005 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:55:35,006 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:55:35,006 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (1/1) ... [2023-11-19 04:55:35,012 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:55:35,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:35,035 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:55:35,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:55:35,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:55:35,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:55:35,068 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:55:35,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:55:35,126 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:55:35,128 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:55:35,264 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:55:35,298 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:55:35,299 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:55:35,303 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:55:35 BoogieIcfgContainer [2023-11-19 04:55:35,303 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:55:35,306 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:55:35,307 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:55:35,310 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:55:35,311 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:55:34" (1/3) ... [2023-11-19 04:55:35,312 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16beaec0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:55:35, skipping insertion in model container [2023-11-19 04:55:35,312 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:34" (2/3) ... [2023-11-19 04:55:35,312 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16beaec0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:55:35, skipping insertion in model container [2023-11-19 04:55:35,312 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:55:35" (3/3) ... [2023-11-19 04:55:35,314 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_1-2.c [2023-11-19 04:55:35,336 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:55:35,336 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:55:35,382 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:55:35,390 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@22d06a7d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:55:35,390 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:55:35,394 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 04:55:35,401 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:35,402 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 04:55:35,403 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:35,408 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:35,409 INFO L85 PathProgramCache]: Analyzing trace with hash 2252617, now seen corresponding path program 1 times [2023-11-19 04:55:35,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:35,420 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305518380] [2023-11-19 04:55:35,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:35,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:35,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:35,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:35,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:35,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305518380] [2023-11-19 04:55:35,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305518380] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:35,665 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:55:35,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:55:35,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946146185] [2023-11-19 04:55:35,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:35,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:55:35,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:35,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:55:35,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:55:35,711 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:35,750 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-19 04:55:35,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:55:35,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-19 04:55:35,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:35,760 INFO L225 Difference]: With dead ends: 15 [2023-11-19 04:55:35,760 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:55:35,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:55:35,766 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:35,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:35,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:55:35,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2023-11-19 04:55:35,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2023-11-19 04:55:35,813 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2023-11-19 04:55:35,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:35,814 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2023-11-19 04:55:35,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,814 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2023-11-19 04:55:35,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:55:35,815 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:35,815 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:55:35,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:55:35,815 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:35,816 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:35,816 INFO L85 PathProgramCache]: Analyzing trace with hash 2130164165, now seen corresponding path program 1 times [2023-11-19 04:55:35,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:35,830 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921145159] [2023-11-19 04:55:35,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:35,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:35,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:35,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:35,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:35,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921145159] [2023-11-19 04:55:35,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921145159] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:35,914 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:55:35,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 04:55:35,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112640155] [2023-11-19 04:55:35,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:35,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:55:35,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:35,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:55:35,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:55:35,917 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:35,935 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2023-11-19 04:55:35,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:55:35,936 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 04:55:35,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:35,937 INFO L225 Difference]: With dead ends: 13 [2023-11-19 04:55:35,937 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:55:35,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:55:35,939 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:35,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:35,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:55:35,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-19 04:55:35,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2023-11-19 04:55:35,945 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2023-11-19 04:55:35,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:35,945 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2023-11-19 04:55:35,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:35,946 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2023-11-19 04:55:35,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:55:35,946 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:35,947 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:35,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:55:35,947 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:35,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:35,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1585602295, now seen corresponding path program 1 times [2023-11-19 04:55:35,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:35,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601908595] [2023-11-19 04:55:35,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:35,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:35,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:36,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:36,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:36,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601908595] [2023-11-19 04:55:36,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601908595] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:36,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677263830] [2023-11-19 04:55:36,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:36,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:36,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:36,095 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:36,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:55:36,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:36,149 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:55:36,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:36,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:36,219 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:36,266 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:55:36,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677263830] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:36,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [258735887] [2023-11-19 04:55:36,290 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:36,291 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:36,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:36,301 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:36,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:37,022 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:37,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:37,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:37,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:37,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2023-11-19 04:55:37,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302791120] [2023-11-19 04:55:37,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:37,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:55:37,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:37,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:55:37,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:55:37,146 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:37,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:37,327 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2023-11-19 04:55:37,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 04:55:37,328 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 04:55:37,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:37,330 INFO L225 Difference]: With dead ends: 27 [2023-11-19 04:55:37,330 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 04:55:37,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2023-11-19 04:55:37,337 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:37,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 10 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:37,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 04:55:37,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-19 04:55:37,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2023-11-19 04:55:37,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-19 04:55:37,352 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2023-11-19 04:55:37,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:37,353 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-19 04:55:37,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:37,354 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-19 04:55:37,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 04:55:37,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:37,355 INFO L195 NwaCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1] [2023-11-19 04:55:37,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:37,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:37,576 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:37,576 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:37,577 INFO L85 PathProgramCache]: Analyzing trace with hash -140644807, now seen corresponding path program 2 times [2023-11-19 04:55:37,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:37,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908888457] [2023-11-19 04:55:37,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:37,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:37,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:37,863 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-19 04:55:37,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:37,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908888457] [2023-11-19 04:55:37,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908888457] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:37,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321530031] [2023-11-19 04:55:37,869 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:37,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:37,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:37,872 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:37,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:55:37,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-19 04:55:37,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:37,966 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 04:55:37,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:37,989 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-19 04:55:37,989 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:38,033 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-19 04:55:38,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321530031] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:38,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1627498915] [2023-11-19 04:55:38,039 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:38,039 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:38,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:38,040 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:38,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:38,394 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:38,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '349#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:38,490 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:38,491 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:38,491 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-19 04:55:38,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314303134] [2023-11-19 04:55:38,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:38,492 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:55:38,492 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:38,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:55:38,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:55:38,494 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:38,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:38,582 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2023-11-19 04:55:38,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 04:55:38,582 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-19 04:55:38,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:38,584 INFO L225 Difference]: With dead ends: 53 [2023-11-19 04:55:38,585 INFO L226 Difference]: Without dead ends: 37 [2023-11-19 04:55:38,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:55:38,589 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:38,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:38,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-19 04:55:38,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-11-19 04:55:38,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:38,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2023-11-19 04:55:38,611 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 20 [2023-11-19 04:55:38,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:38,612 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2023-11-19 04:55:38,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:38,613 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2023-11-19 04:55:38,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-19 04:55:38,614 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:38,614 INFO L195 NwaCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2023-11-19 04:55:38,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:38,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:38,829 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:38,829 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:38,829 INFO L85 PathProgramCache]: Analyzing trace with hash 500624441, now seen corresponding path program 3 times [2023-11-19 04:55:38,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:38,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105857465] [2023-11-19 04:55:38,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:38,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:38,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:39,058 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-19 04:55:39,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:39,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105857465] [2023-11-19 04:55:39,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105857465] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:39,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893964701] [2023-11-19 04:55:39,060 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:55:39,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:39,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:39,061 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:39,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:55:39,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:55:39,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:39,129 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 04:55:39,131 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:39,323 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-19 04:55:39,326 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:39,736 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 10 proven. 314 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-19 04:55:39,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893964701] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:39,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518326642] [2023-11-19 04:55:39,738 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:39,738 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:39,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:39,739 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:39,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:40,019 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:40,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '764#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:40,203 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:40,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:40,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 29 [2023-11-19 04:55:40,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394658780] [2023-11-19 04:55:40,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:40,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-19 04:55:40,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:40,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-19 04:55:40,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2023-11-19 04:55:40,207 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 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) [2023-11-19 04:55:44,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:44,959 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2023-11-19 04:55:44,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2023-11-19 04:55:44,969 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 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) Word has length 36 [2023-11-19 04:55:44,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:44,975 INFO L225 Difference]: With dead ends: 135 [2023-11-19 04:55:44,975 INFO L226 Difference]: Without dead ends: 107 [2023-11-19 04:55:44,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5253 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2638, Invalid=11168, Unknown=0, NotChecked=0, Total=13806 [2023-11-19 04:55:44,983 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 73 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:44,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 24 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:55:44,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-19 04:55:45,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-11-19 04:55:45,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 106 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:45,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 129 transitions. [2023-11-19 04:55:45,044 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 129 transitions. Word has length 36 [2023-11-19 04:55:45,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:45,045 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 129 transitions. [2023-11-19 04:55:45,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 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) [2023-11-19 04:55:45,046 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 129 transitions. [2023-11-19 04:55:45,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-19 04:55:45,051 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:45,051 INFO L195 NwaCegarLoop]: trace histogram [70, 10, 10, 1, 1, 1, 1] [2023-11-19 04:55:45,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:45,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:45,275 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:45,275 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:45,276 INFO L85 PathProgramCache]: Analyzing trace with hash 198990345, now seen corresponding path program 4 times [2023-11-19 04:55:45,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:45,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301394105] [2023-11-19 04:55:45,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:45,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:45,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:45,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 586 proven. 28 refuted. 0 times theorem prover too weak. 2601 trivial. 0 not checked. [2023-11-19 04:55:45,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:45,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301394105] [2023-11-19 04:55:45,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301394105] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:45,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88030513] [2023-11-19 04:55:45,828 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:55:45,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:45,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:45,830 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:45,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:55:45,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:45,953 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-19 04:55:45,958 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:46,260 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 0 proven. 2935 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2023-11-19 04:55:46,260 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 0 proven. 1630 refuted. 0 times theorem prover too weak. 1585 trivial. 0 not checked. [2023-11-19 04:55:46,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88030513] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:46,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587284524] [2023-11-19 04:55:46,527 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:46,527 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:46,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:46,528 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:46,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:46,745 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:46,893 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1995#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:46,893 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:46,896 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:46,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 4] total 25 [2023-11-19 04:55:46,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274205592] [2023-11-19 04:55:46,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:46,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 04:55:46,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:46,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 04:55:46,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=680, Unknown=0, NotChecked=0, Total=756 [2023-11-19 04:55:46,900 INFO L87 Difference]: Start difference. First operand 107 states and 129 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 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) [2023-11-19 04:55:49,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:49,635 INFO L93 Difference]: Finished difference Result 436 states and 566 transitions. [2023-11-19 04:55:49,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2023-11-19 04:55:49,636 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 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 94 [2023-11-19 04:55:49,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:49,638 INFO L225 Difference]: With dead ends: 436 [2023-11-19 04:55:49,639 INFO L226 Difference]: Without dead ends: 338 [2023-11-19 04:55:49,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5654 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=932, Invalid=16624, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 04:55:49,650 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 14 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1822 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:49,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 33 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1822 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 04:55:49,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2023-11-19 04:55:49,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 123. [2023-11-19 04:55:49,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1639344262295082) internal successors, (142), 122 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:49,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2023-11-19 04:55:49,716 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 94 [2023-11-19 04:55:49,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:49,716 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2023-11-19 04:55:49,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 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) [2023-11-19 04:55:49,716 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2023-11-19 04:55:49,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-19 04:55:49,718 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:49,718 INFO L195 NwaCegarLoop]: trace histogram [88, 11, 11, 1, 1, 1, 1] [2023-11-19 04:55:49,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:49,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:49,931 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:49,931 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:49,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1024538781, now seen corresponding path program 5 times [2023-11-19 04:55:49,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:49,931 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639547849] [2023-11-19 04:55:49,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:49,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:50,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:50,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-19 04:55:50,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:50,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639547849] [2023-11-19 04:55:50,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639547849] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:50,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353878636] [2023-11-19 04:55:50,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:50,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:50,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:50,383 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:50,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:55:50,468 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-19 04:55:50,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:50,469 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-19 04:55:50,474 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:50,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-19 04:55:50,508 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:50,675 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-19 04:55:50,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353878636] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:50,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1177665197] [2023-11-19 04:55:50,678 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:50,678 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:50,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:50,679 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:50,679 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:50,891 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:51,013 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4014#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:51,013 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:51,014 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:51,014 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-11-19 04:55:51,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743166] [2023-11-19 04:55:51,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:51,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-19 04:55:51,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:51,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-19 04:55:51,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-19 04:55:51,016 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2023-11-19 04:55:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:51,143 INFO L93 Difference]: Finished difference Result 249 states and 300 transitions. [2023-11-19 04:55:51,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:55:51,144 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 114 [2023-11-19 04:55:51,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:51,145 INFO L225 Difference]: With dead ends: 249 [2023-11-19 04:55:51,145 INFO L226 Difference]: Without dead ends: 137 [2023-11-19 04:55:51,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-19 04:55:51,147 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:51,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:55:51,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-11-19 04:55:51,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2023-11-19 04:55:51,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.088235294117647) internal successors, (148), 136 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:51,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 148 transitions. [2023-11-19 04:55:51,191 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 148 transitions. Word has length 114 [2023-11-19 04:55:51,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:51,192 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 148 transitions. [2023-11-19 04:55:51,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2023-11-19 04:55:51,192 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 148 transitions. [2023-11-19 04:55:51,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-11-19 04:55:51,194 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:51,194 INFO L195 NwaCegarLoop]: trace histogram [110, 11, 11, 1, 1, 1, 1] [2023-11-19 04:55:51,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:51,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:51,408 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:51,409 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:51,409 INFO L85 PathProgramCache]: Analyzing trace with hash 17179741, now seen corresponding path program 6 times [2023-11-19 04:55:51,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:51,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358867206] [2023-11-19 04:55:51,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:51,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:51,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:52,108 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-19 04:55:52,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:52,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358867206] [2023-11-19 04:55:52,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358867206] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:52,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942419087] [2023-11-19 04:55:52,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:55:52,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:52,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:52,112 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:52,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:55:52,265 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:55:52,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:52,268 INFO L262 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-19 04:55:52,273 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:52,473 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-19 04:55:52,473 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:53,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-19 04:55:53,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942419087] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:53,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275618345] [2023-11-19 04:55:53,024 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:55:53,024 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:53,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:53,024 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:53,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:53,233 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:53,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5615#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:55:53,379 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:55:53,379 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:53,379 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-11-19 04:55:53,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529636638] [2023-11-19 04:55:53,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:53,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-19 04:55:53,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:53,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-19 04:55:53,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=642, Unknown=0, NotChecked=0, Total=870 [2023-11-19 04:55:53,382 INFO L87 Difference]: Start difference. First operand 137 states and 148 transitions. Second operand has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 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) [2023-11-19 04:55:55,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:55,430 INFO L93 Difference]: Finished difference Result 626 states and 691 transitions. [2023-11-19 04:55:55,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-19 04:55:55,430 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 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 136 [2023-11-19 04:55:55,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:55,435 INFO L225 Difference]: With dead ends: 626 [2023-11-19 04:55:55,435 INFO L226 Difference]: Without dead ends: 623 [2023-11-19 04:55:55,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=525, Invalid=1115, Unknown=0, NotChecked=0, Total=1640 [2023-11-19 04:55:55,437 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:55,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 184 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:55:55,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2023-11-19 04:55:55,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 305. [2023-11-19 04:55:55,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0855263157894737) internal successors, (330), 304 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:55:55,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 330 transitions. [2023-11-19 04:55:55,594 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 330 transitions. Word has length 136 [2023-11-19 04:55:55,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:55,595 INFO L495 AbstractCegarLoop]: Abstraction has 305 states and 330 transitions. [2023-11-19 04:55:55,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 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) [2023-11-19 04:55:55,595 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 330 transitions. [2023-11-19 04:55:55,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2023-11-19 04:55:55,600 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:55,601 INFO L195 NwaCegarLoop]: trace histogram [250, 25, 25, 1, 1, 1, 1] [2023-11-19 04:55:55,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:55,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 04:55:55,823 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:55,823 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:55,823 INFO L85 PathProgramCache]: Analyzing trace with hash 669174437, now seen corresponding path program 7 times [2023-11-19 04:55:55,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:55,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198277499] [2023-11-19 04:55:55,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:55,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:56,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:58,418 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-19 04:55:58,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:58,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198277499] [2023-11-19 04:55:58,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198277499] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:58,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816900261] [2023-11-19 04:55:58,419 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:55:58,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:58,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:58,424 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:58,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_067a50b0-2239-4ca4-a496-263ada7008b9/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:55:58,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:58,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 933 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-19 04:55:58,731 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:59,122 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-19 04:55:59,123 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:01,064 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-19 04:56:01,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816900261] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:01,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069126758] [2023-11-19 04:56:01,067 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:01,067 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:01,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:01,067 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:01,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:01,273 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:01,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9364#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:56:01,574 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:01,574 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:01,574 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2023-11-19 04:56:01,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757529602] [2023-11-19 04:56:01,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:01,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-11-19 04:56:01,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:01,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-11-19 04:56:01,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=2462, Unknown=0, NotChecked=0, Total=3306 [2023-11-19 04:56:01,582 INFO L87 Difference]: Start difference. First operand 305 states and 330 transitions. Second operand has 55 states, 55 states have (on average 2.8727272727272726) internal successors, (158), 54 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)