./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-new/half.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-new/half.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd8ea842760c1d795b2a0ad721eea8bf94078967bffa91c75f5537bf4a53b968 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:00:58,432 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:00:58,516 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-25 00:00:58,522 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:00:58,523 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:00:58,550 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:00:58,551 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:00:58,552 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:00:58,553 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:00:58,553 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:00:58,554 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:00:58,555 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:00:58,555 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:00:58,556 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:00:58,556 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:00:58,557 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:00:58,557 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:00:58,558 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:00:58,558 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:00:58,559 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:00:58,559 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:00:58,562 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:00:58,563 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:00:58,581 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-25 00:00:58,581 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:00:58,581 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:00:58,582 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:00:58,582 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:00:58,583 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-25 00:00:58,583 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:00:58,583 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-25 00:00:58,584 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:00:58,584 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-25 00:00:58,585 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:00:58,585 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:00:58,586 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:00:58,586 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:00:58,586 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:00:58,587 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:00:58,587 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:00:58,588 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-25 00:00:58,590 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:00:58,591 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:00:58,591 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:00:58,591 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-25 00:00:58,592 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:00:58,592 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:00:58,592 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_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd8ea842760c1d795b2a0ad721eea8bf94078967bffa91c75f5537bf4a53b968 [2023-11-25 00:00:58,943 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:00:58,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:00:58,971 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:00:58,972 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:00:58,974 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:00:58,976 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/loop-new/half.i [2023-11-25 00:01:02,125 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:01:02,389 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:01:02,391 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/sv-benchmarks/c/loop-new/half.i [2023-11-25 00:01:02,402 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/data/04ff5af28/9b3a75cc4e3049ab977495b2f9735518/FLAG20a20c56b [2023-11-25 00:01:02,420 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/data/04ff5af28/9b3a75cc4e3049ab977495b2f9735518 [2023-11-25 00:01:02,427 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:01:02,429 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:01:02,433 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:01:02,433 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:01:02,439 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:01:02,440 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,441 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@706319fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02, skipping insertion in model container [2023-11-25 00:01:02,441 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,468 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:01:02,664 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_92f52459-9bef-48b7-9428-f9be9e42382e/sv-benchmarks/c/loop-new/half.i[891,904] [2023-11-25 00:01:02,681 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:01:02,693 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:01:02,707 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_92f52459-9bef-48b7-9428-f9be9e42382e/sv-benchmarks/c/loop-new/half.i[891,904] [2023-11-25 00:01:02,711 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:01:02,726 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:01:02,726 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02 WrapperNode [2023-11-25 00:01:02,727 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:01:02,728 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:01:02,728 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:01:02,728 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:01:02,736 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,743 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,761 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 38 [2023-11-25 00:01:02,761 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:01:02,762 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:01:02,762 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:01:02,762 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:01:02,770 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,771 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,772 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,772 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,775 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,778 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,779 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,779 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,781 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:01:02,782 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:01:02,782 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:01:02,782 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:01:02,783 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (1/1) ... [2023-11-25 00:01:02,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:01:02,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:02,819 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:01:02,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:01:02,854 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:01:02,854 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:01:02,854 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:01:02,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:01:02,917 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:01:02,919 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:01:03,032 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:01:03,078 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:01:03,079 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-25 00:01:03,080 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:01:03 BoogieIcfgContainer [2023-11-25 00:01:03,081 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:01:03,083 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:01:03,083 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:01:03,087 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:01:03,087 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:01:02" (1/3) ... [2023-11-25 00:01:03,088 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f40123d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:01:03, skipping insertion in model container [2023-11-25 00:01:03,088 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:01:02" (2/3) ... [2023-11-25 00:01:03,089 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f40123d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:01:03, skipping insertion in model container [2023-11-25 00:01:03,089 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:01:03" (3/3) ... [2023-11-25 00:01:03,090 INFO L112 eAbstractionObserver]: Analyzing ICFG half.i [2023-11-25 00:01:03,109 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:01:03,110 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-25 00:01:03,153 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:01:03,159 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;@370ccce6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:01:03,160 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-25 00:01:03,164 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:03,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:01:03,171 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:03,171 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:01:03,172 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:03,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:03,178 INFO L85 PathProgramCache]: Analyzing trace with hash 66745263, now seen corresponding path program 1 times [2023-11-25 00:01:03,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:03,186 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297990556] [2023-11-25 00:01:03,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:03,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:03,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:03,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:03,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297990556] [2023-11-25 00:01:03,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297990556] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:01:03,731 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:01:03,731 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:01:03,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908479088] [2023-11-25 00:01:03,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:01:03,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-25 00:01:03,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:03,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-25 00:01:03,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-25 00:01:03,781 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:03,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:03,933 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2023-11-25 00:01:03,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-25 00:01:03,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2023-11-25 00:01:03,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:03,944 INFO L225 Difference]: With dead ends: 24 [2023-11-25 00:01:03,944 INFO L226 Difference]: Without dead ends: 11 [2023-11-25 00:01:03,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:01:03,953 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:03,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 12 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:01:03,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-25 00:01:03,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 7. [2023-11-25 00:01:03,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:03,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2023-11-25 00:01:03,994 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2023-11-25 00:01:03,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:03,995 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2023-11-25 00:01:03,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:03,996 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2023-11-25 00:01:03,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-25 00:01:03,997 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:03,997 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-25 00:01:03,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:01:03,998 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:03,999 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:03,999 INFO L85 PathProgramCache]: Analyzing trace with hash 2069206910, now seen corresponding path program 1 times [2023-11-25 00:01:03,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:03,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378639962] [2023-11-25 00:01:03,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:04,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:04,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:04,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:04,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:04,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378639962] [2023-11-25 00:01:04,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378639962] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:04,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973110071] [2023-11-25 00:01:04,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:04,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:04,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:04,161 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:04,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:01:04,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:04,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-25 00:01:04,237 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:04,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:04,344 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:04,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:04,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973110071] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:04,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [23554012] [2023-11-25 00:01:04,448 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:04,449 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:04,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:04,459 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:04,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:04,858 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:05,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:05,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:05,044 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:05,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-25 00:01:05,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539114187] [2023-11-25 00:01:05,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:05,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-25 00:01:05,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:05,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-25 00:01:05,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-25 00:01:05,048 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:05,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:05,073 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2023-11-25 00:01:05,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:01:05,074 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-25 00:01:05,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:05,074 INFO L225 Difference]: With dead ends: 11 [2023-11-25 00:01:05,074 INFO L226 Difference]: Without dead ends: 8 [2023-11-25 00:01:05,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-25 00:01:05,077 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:05,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:01:05,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-25 00:01:05,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-25 00:01:05,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 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) [2023-11-25 00:01:05,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2023-11-25 00:01:05,081 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2023-11-25 00:01:05,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:05,082 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2023-11-25 00:01:05,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:05,082 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2023-11-25 00:01:05,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-25 00:01:05,083 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:05,083 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2023-11-25 00:01:05,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:05,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:05,290 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:05,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:05,291 INFO L85 PathProgramCache]: Analyzing trace with hash -278991473, now seen corresponding path program 2 times [2023-11-25 00:01:05,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:05,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049037210] [2023-11-25 00:01:05,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:05,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:05,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:05,882 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:05,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:05,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049037210] [2023-11-25 00:01:05,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049037210] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:05,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312131306] [2023-11-25 00:01:05,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:01:05,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:05,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:05,896 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:05,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:01:05,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-25 00:01:05,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:01:05,950 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-25 00:01:05,952 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:06,083 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:06,084 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:06,475 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:06,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312131306] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:06,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1600713272] [2023-11-25 00:01:06,483 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:06,484 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:06,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:06,484 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:06,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:06,642 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:06,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '175#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:06,833 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:06,833 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:06,833 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2023-11-25 00:01:06,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386993247] [2023-11-25 00:01:06,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:06,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-25 00:01:06,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:06,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-25 00:01:06,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2023-11-25 00:01:06,837 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 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) [2023-11-25 00:01:07,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:07,037 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2023-11-25 00:01:07,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-25 00:01:07,038 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 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 [2023-11-25 00:01:07,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:07,039 INFO L225 Difference]: With dead ends: 16 [2023-11-25 00:01:07,039 INFO L226 Difference]: Without dead ends: 11 [2023-11-25 00:01:07,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2023-11-25 00:01:07,041 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:07,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:01:07,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-25 00:01:07,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-25 00:01:07,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:07,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2023-11-25 00:01:07,047 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 7 [2023-11-25 00:01:07,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:07,047 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2023-11-25 00:01:07,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 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) [2023-11-25 00:01:07,048 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2023-11-25 00:01:07,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-25 00:01:07,048 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:07,048 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1] [2023-11-25 00:01:07,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:07,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:07,254 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:07,255 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:07,255 INFO L85 PathProgramCache]: Analyzing trace with hash -570223682, now seen corresponding path program 3 times [2023-11-25 00:01:07,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:07,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904802854] [2023-11-25 00:01:07,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:07,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:07,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:07,434 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:07,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:07,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904802854] [2023-11-25 00:01:07,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904802854] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:07,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360194984] [2023-11-25 00:01:07,435 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-25 00:01:07,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:07,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:07,437 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:07,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:01:07,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-25 00:01:07,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:01:07,509 WARN L260 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-25 00:01:07,511 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:07,675 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:07,675 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:08,080 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:08,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360194984] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:08,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062553411] [2023-11-25 00:01:08,084 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:08,085 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:08,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:08,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:08,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:08,194 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:08,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '304#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:08,440 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:08,440 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:08,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 22 [2023-11-25 00:01:08,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374503305] [2023-11-25 00:01:08,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:08,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-25 00:01:08,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:08,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-25 00:01:08,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2023-11-25 00:01:08,443 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 22 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:09,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:09,074 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2023-11-25 00:01:09,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-25 00:01:09,075 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-25 00:01:09,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:09,075 INFO L225 Difference]: With dead ends: 25 [2023-11-25 00:01:09,075 INFO L226 Difference]: Without dead ends: 18 [2023-11-25 00:01:09,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=284, Invalid=1122, Unknown=0, NotChecked=0, Total=1406 [2023-11-25 00:01:09,077 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:09,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 27 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:01:09,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-25 00:01:09,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-25 00:01:09,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:09,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2023-11-25 00:01:09,084 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 10 [2023-11-25 00:01:09,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:09,085 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2023-11-25 00:01:09,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:09,085 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2023-11-25 00:01:09,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-25 00:01:09,085 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:09,086 INFO L195 NwaCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1] [2023-11-25 00:01:09,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:09,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:09,287 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:09,287 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:09,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1997224209, now seen corresponding path program 4 times [2023-11-25 00:01:09,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:09,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440383002] [2023-11-25 00:01:09,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:09,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:09,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:11,325 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:11,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:11,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440383002] [2023-11-25 00:01:11,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440383002] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:11,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145406433] [2023-11-25 00:01:11,326 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-25 00:01:11,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:11,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:11,328 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:11,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:01:11,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:11,408 WARN L260 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-25 00:01:11,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:11,637 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:11,637 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:12,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145406433] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:12,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758277827] [2023-11-25 00:01:12,566 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:12,566 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:12,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:12,567 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:12,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:12,715 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:12,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '532#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:12,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:12,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:12,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 34 [2023-11-25 00:01:12,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225738184] [2023-11-25 00:01:12,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:12,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-25 00:01:12,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:12,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-25 00:01:12,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2023-11-25 00:01:12,981 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:15,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:15,493 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2023-11-25 00:01:15,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-25 00:01:15,494 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-25 00:01:15,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:15,495 INFO L225 Difference]: With dead ends: 46 [2023-11-25 00:01:15,495 INFO L226 Difference]: Without dead ends: 31 [2023-11-25 00:01:15,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1121, Invalid=4429, Unknown=0, NotChecked=0, Total=5550 [2023-11-25 00:01:15,499 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 67 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:15,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 29 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:01:15,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-25 00:01:15,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-25 00:01:15,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:15,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2023-11-25 00:01:15,512 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 17 [2023-11-25 00:01:15,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:15,512 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2023-11-25 00:01:15,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:15,513 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2023-11-25 00:01:15,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-25 00:01:15,514 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:15,514 INFO L195 NwaCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1] [2023-11-25 00:01:15,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:15,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:15,720 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:15,720 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:15,721 INFO L85 PathProgramCache]: Analyzing trace with hash -692281090, now seen corresponding path program 5 times [2023-11-25 00:01:15,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:15,721 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437860026] [2023-11-25 00:01:15,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:15,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:15,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:17,164 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:17,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:17,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437860026] [2023-11-25 00:01:17,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437860026] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:17,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122774671] [2023-11-25 00:01:17,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:01:17,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:17,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:17,166 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:17,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-25 00:01:17,320 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-11-25 00:01:17,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:01:17,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 54 conjunts are in the unsatisfiable core [2023-11-25 00:01:17,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:18,354 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:18,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:18,598 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-11-25 00:01:18,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122774671] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:18,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765181648] [2023-11-25 00:01:18,602 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:18,602 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:18,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:18,602 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:18,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:18,702 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:19,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '967#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:19,119 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:19,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:19,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 5] total 56 [2023-11-25 00:01:19,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764834669] [2023-11-25 00:01:19,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:19,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-11-25 00:01:19,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:19,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-11-25 00:01:19,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3365, Unknown=0, NotChecked=0, Total=3540 [2023-11-25 00:01:19,128 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:20,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:20,249 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2023-11-25 00:01:20,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-25 00:01:20,250 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2023-11-25 00:01:20,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:20,251 INFO L225 Difference]: With dead ends: 36 [2023-11-25 00:01:20,251 INFO L226 Difference]: Without dead ends: 33 [2023-11-25 00:01:20,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=264, Invalid=4992, Unknown=0, NotChecked=0, Total=5256 [2023-11-25 00:01:20,254 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 1110 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 1111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:20,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 83 Invalid, 1111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1110 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-25 00:01:20,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-25 00:01:20,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-11-25 00:01:20,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 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) [2023-11-25 00:01:20,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2023-11-25 00:01:20,268 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2023-11-25 00:01:20,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:20,268 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2023-11-25 00:01:20,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:20,269 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2023-11-25 00:01:20,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-25 00:01:20,270 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:20,270 INFO L195 NwaCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1] [2023-11-25 00:01:20,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:20,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:20,476 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:20,476 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:20,476 INFO L85 PathProgramCache]: Analyzing trace with hash 14226447, now seen corresponding path program 6 times [2023-11-25 00:01:20,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:20,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338399227] [2023-11-25 00:01:20,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:20,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:20,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:01:25,655 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:25,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:01:25,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338399227] [2023-11-25 00:01:25,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338399227] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:01:25,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867346071] [2023-11-25 00:01:25,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-25 00:01:25,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:01:25,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:01:25,658 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:01:25,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-25 00:01:25,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-25 00:01:25,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:01:25,819 WARN L260 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 90 conjunts are in the unsatisfiable core [2023-11-25 00:01:25,825 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:01:26,159 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:26,160 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:01:28,549 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:01:28,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867346071] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:01:28,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1963634176] [2023-11-25 00:01:28,552 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-25 00:01:28,552 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:01:28,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:01:28,553 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:01:28,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:01:28,656 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:01:28,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1363#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= |ULTIMATE.start_main_~k~0#1| 1000000) (<= (* 2 |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)))' at error location [2023-11-25 00:01:28,972 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:01:28,973 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:01:28,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 62 [2023-11-25 00:01:28,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388441632] [2023-11-25 00:01:28,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:01:28,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2023-11-25 00:01:28,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:01:28,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2023-11-25 00:01:28,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1027, Invalid=3395, Unknown=0, NotChecked=0, Total=4422 [2023-11-25 00:01:28,979 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:34,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:01:34,170 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2023-11-25 00:01:34,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-11-25 00:01:34,171 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2023-11-25 00:01:34,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:01:34,172 INFO L225 Difference]: With dead ends: 76 [2023-11-25 00:01:34,172 INFO L226 Difference]: Without dead ends: 60 [2023-11-25 00:01:34,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=3762, Invalid=13268, Unknown=0, NotChecked=0, Total=17030 [2023-11-25 00:01:34,180 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 86 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-25 00:01:34,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 29 Invalid, 856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-25 00:01:34,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-25 00:01:34,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-11-25 00:01:34,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 59 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:34,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2023-11-25 00:01:34,204 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 31 [2023-11-25 00:01:34,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:01:34,205 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2023-11-25 00:01:34,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:01:34,205 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2023-11-25 00:01:34,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-25 00:01:34,207 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:01:34,207 INFO L195 NwaCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1] [2023-11-25 00:01:34,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-25 00:01:34,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f52459-9bef-48b7-9428-f9be9e42382e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-25 00:01:34,414 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:01:34,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:01:34,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1078245809, now seen corresponding path program 7 times [2023-11-25 00:01:34,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:01:34,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451816328] [2023-11-25 00:01:34,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:01:34,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:01:34,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat