./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/loop-acceleration/array3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/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_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/loop-acceleration/array3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:06:11,608 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:06:11,690 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-25 00:06:11,694 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:06:11,695 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:06:11,738 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:06:11,739 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:06:11,740 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:06:11,741 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:06:11,750 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:06:11,751 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:06:11,752 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:06:11,753 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:06:11,755 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:06:11,755 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:06:11,756 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:06:11,756 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:06:11,757 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:06:11,757 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:06:11,759 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:06:11,760 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:06:11,760 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:06:11,761 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-25 00:06:11,762 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-25 00:06:11,763 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:06:11,763 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:06:11,764 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:06:11,764 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:06:11,764 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:06:11,765 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-25 00:06:11,766 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-25 00:06:11,767 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-25 00:06:11,767 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:06:11,768 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-25 00:06:11,768 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-25 00:06:11,768 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:06:11,768 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:06:11,769 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:06:11,769 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:06:11,769 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:06:11,770 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:06:11,770 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:06:11,770 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:06:11,771 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:06:11,771 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:06:11,772 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:06:11,772 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:06:11,772 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:06:11,772 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_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea [2023-11-25 00:06:12,086 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:06:12,115 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:06:12,118 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:06:12,120 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:06:12,125 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:06:12,126 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/loop-acceleration/array3.i [2023-11-25 00:06:15,366 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:06:15,603 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:06:15,603 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/sv-benchmarks/c/loop-acceleration/array3.i [2023-11-25 00:06:15,612 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/data/bde6c4d03/65b3c6013f2f4dd5a70a3611f8451fd1/FLAG79fdb05c4 [2023-11-25 00:06:15,630 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/data/bde6c4d03/65b3c6013f2f4dd5a70a3611f8451fd1 [2023-11-25 00:06:15,633 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:06:15,635 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:06:15,637 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:06:15,637 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:06:15,644 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:06:15,645 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,646 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44a61057 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15, skipping insertion in model container [2023-11-25 00:06:15,646 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,671 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:06:15,848 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:06:15,860 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:06:15,878 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:06:15,893 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:06:15,893 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15 WrapperNode [2023-11-25 00:06:15,893 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:06:15,894 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:06:15,895 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:06:15,895 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:06:15,901 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,908 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,928 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 47 [2023-11-25 00:06:15,928 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:06:15,929 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:06:15,929 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:06:15,929 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:06:15,940 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,940 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,942 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,942 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,949 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,953 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,954 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,955 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,958 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:06:15,959 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:06:15,959 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:06:15,959 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:06:15,960 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (1/1) ... [2023-11-25 00:06:15,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:06:15,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:16,002 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:06:16,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:06:16,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:06:16,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:06:16,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-25 00:06:16,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-25 00:06:16,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:06:16,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:06:16,049 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-25 00:06:16,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-25 00:06:16,120 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:06:16,122 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:06:16,301 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:06:16,341 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:06:16,341 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-25 00:06:16,361 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:06:16 BoogieIcfgContainer [2023-11-25 00:06:16,361 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:06:16,364 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:06:16,365 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:06:16,368 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:06:16,369 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:06:15" (1/3) ... [2023-11-25 00:06:16,369 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbfce1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:06:16, skipping insertion in model container [2023-11-25 00:06:16,370 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:15" (2/3) ... [2023-11-25 00:06:16,370 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbfce1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:06:16, skipping insertion in model container [2023-11-25 00:06:16,370 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:06:16" (3/3) ... [2023-11-25 00:06:16,372 INFO L112 eAbstractionObserver]: Analyzing ICFG array3.i [2023-11-25 00:06:16,392 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:06:16,392 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2023-11-25 00:06:16,440 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:06:16,447 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@7428fb28, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:06:16,447 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-11-25 00:06:16,452 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:16,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-25 00:06:16,458 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:16,459 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-25 00:06:16,459 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:16,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:16,465 INFO L85 PathProgramCache]: Analyzing trace with hash 96466, now seen corresponding path program 1 times [2023-11-25 00:06:16,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:16,474 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479166702] [2023-11-25 00:06:16,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:16,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:16,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:16,665 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 00:06:16,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:16,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479166702] [2023-11-25 00:06:16,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479166702] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:06:16,667 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:06:16,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:06:16,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774762426] [2023-11-25 00:06:16,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:06:16,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:06:16,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:16,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:06:16,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:16,711 INFO L87 Difference]: Start difference. First operand has 20 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:16,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:16,810 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2023-11-25 00:06:16,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:06:16,816 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2023-11-25 00:06:16,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:16,824 INFO L225 Difference]: With dead ends: 36 [2023-11-25 00:06:16,824 INFO L226 Difference]: Without dead ends: 35 [2023-11-25 00:06:16,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:16,832 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:16,833 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:06:16,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-25 00:06:16,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2023-11-25 00:06:16,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.6875) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:16,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-25 00:06:16,873 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 3 [2023-11-25 00:06:16,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:16,873 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-25 00:06:16,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:16,874 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-25 00:06:16,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-25 00:06:16,875 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:16,875 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-25 00:06:16,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:06:16,876 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:16,877 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:16,877 INFO L85 PathProgramCache]: Analyzing trace with hash 94500, now seen corresponding path program 1 times [2023-11-25 00:06:16,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:16,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418699542] [2023-11-25 00:06:16,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:16,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:16,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:17,008 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 00:06:17,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:17,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418699542] [2023-11-25 00:06:17,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418699542] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:06:17,010 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:06:17,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-25 00:06:17,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363487480] [2023-11-25 00:06:17,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:06:17,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:06:17,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:17,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:06:17,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:17,019 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:17,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:17,042 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2023-11-25 00:06:17,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:06:17,043 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2023-11-25 00:06:17,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:17,044 INFO L225 Difference]: With dead ends: 20 [2023-11-25 00:06:17,044 INFO L226 Difference]: Without dead ends: 20 [2023-11-25 00:06:17,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:17,047 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:17,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:06:17,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-25 00:06:17,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-25 00:06:17,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.5) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:17,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-25 00:06:17,052 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 3 [2023-11-25 00:06:17,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:17,052 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-25 00:06:17,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:17,053 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-25 00:06:17,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-25 00:06:17,054 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:17,054 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-25 00:06:17,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-25 00:06:17,055 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:17,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:17,055 INFO L85 PathProgramCache]: Analyzing trace with hash 94501, now seen corresponding path program 1 times [2023-11-25 00:06:17,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:17,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642702498] [2023-11-25 00:06:17,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:17,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:17,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:17,226 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 00:06:17,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:17,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642702498] [2023-11-25 00:06:17,227 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642702498] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:06:17,227 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:06:17,227 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-25 00:06:17,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003249182] [2023-11-25 00:06:17,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:06:17,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:06:17,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:17,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:06:17,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:17,234 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:17,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:17,289 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-25 00:06:17,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:06:17,292 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2023-11-25 00:06:17,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:17,296 INFO L225 Difference]: With dead ends: 21 [2023-11-25 00:06:17,298 INFO L226 Difference]: Without dead ends: 21 [2023-11-25 00:06:17,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:06:17,301 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:17,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:06:17,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-25 00:06:17,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-25 00:06:17,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:17,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-25 00:06:17,315 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 3 [2023-11-25 00:06:17,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:17,316 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-25 00:06:17,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 00:06:17,317 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-25 00:06:17,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:06:17,317 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:17,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:06:17,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-25 00:06:17,318 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:17,319 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:17,320 INFO L85 PathProgramCache]: Analyzing trace with hash 90871566, now seen corresponding path program 1 times [2023-11-25 00:06:17,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:17,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395574130] [2023-11-25 00:06:17,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:17,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:17,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:17,432 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 00:06:17,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:17,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395574130] [2023-11-25 00:06:17,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395574130] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:17,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802482031] [2023-11-25 00:06:17,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:17,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:17,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:17,437 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:17,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:06:17,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:17,516 INFO L262 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-25 00:06:17,521 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:17,600 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 00:06:17,600 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:17,626 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 00:06:17,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802482031] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:17,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122406737] [2023-11-25 00:06:17,648 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-25 00:06:17,648 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:17,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:17,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:17,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:18,291 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:18,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '203#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) 3) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0))' at error location [2023-11-25 00:06:18,355 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:18,355 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:18,355 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-25 00:06:18,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300727599] [2023-11-25 00:06:18,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:18,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-25 00:06:18,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:18,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-25 00:06:18,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2023-11-25 00:06:18,358 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 00:06:18,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:18,434 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2023-11-25 00:06:18,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:06:18,435 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 5 [2023-11-25 00:06:18,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:18,436 INFO L225 Difference]: With dead ends: 73 [2023-11-25 00:06:18,436 INFO L226 Difference]: Without dead ends: 73 [2023-11-25 00:06:18,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2023-11-25 00:06:18,438 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 96 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:18,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 36 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:06:18,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-11-25 00:06:18,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 35. [2023-11-25 00:06:18,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 34 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:18,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2023-11-25 00:06:18,445 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 5 [2023-11-25 00:06:18,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:18,445 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2023-11-25 00:06:18,446 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 00:06:18,446 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2023-11-25 00:06:18,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:06:18,446 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:18,447 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-25 00:06:18,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:18,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:18,653 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:18,654 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:18,654 INFO L85 PathProgramCache]: Analyzing trace with hash 90869600, now seen corresponding path program 1 times [2023-11-25 00:06:18,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:18,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499046183] [2023-11-25 00:06:18,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:18,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:18,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:18,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:18,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:18,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499046183] [2023-11-25 00:06:18,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499046183] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:18,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800000664] [2023-11-25 00:06:18,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:18,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:18,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:18,822 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:18,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:06:18,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:18,876 INFO L262 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-25 00:06:18,878 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:18,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-25 00:06:18,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:18,965 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:19,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:19,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800000664] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:19,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874310808] [2023-11-25 00:06:19,037 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-25 00:06:19,037 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:19,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:19,037 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:19,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:19,361 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:19,481 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '348#(and (<= |ULTIMATE.start_main_#t~nondet2#1| 2147483647) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet2#1|)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-25 00:06:19,481 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:19,481 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:19,481 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 7 [2023-11-25 00:06:19,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798816712] [2023-11-25 00:06:19,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:19,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-25 00:06:19,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:19,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-25 00:06:19,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-25 00:06:19,491 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:19,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:19,671 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2023-11-25 00:06:19,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-25 00:06:19,671 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-25 00:06:19,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:19,673 INFO L225 Difference]: With dead ends: 52 [2023-11-25 00:06:19,674 INFO L226 Difference]: Without dead ends: 52 [2023-11-25 00:06:19,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2023-11-25 00:06:19,675 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 89 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:19,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 49 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:06:19,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-25 00:06:19,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2023-11-25 00:06:19,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:19,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2023-11-25 00:06:19,692 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 5 [2023-11-25 00:06:19,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:19,692 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2023-11-25 00:06:19,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:19,693 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2023-11-25 00:06:19,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-25 00:06:19,694 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:19,694 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:06:19,702 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-25 00:06:19,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:19,900 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:19,900 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:19,901 INFO L85 PathProgramCache]: Analyzing trace with hash -728749219, now seen corresponding path program 1 times [2023-11-25 00:06:19,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:19,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834342627] [2023-11-25 00:06:19,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:19,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:19,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:20,015 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-25 00:06:20,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:20,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834342627] [2023-11-25 00:06:20,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834342627] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:06:20,016 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:06:20,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:06:20,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148809890] [2023-11-25 00:06:20,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:06:20,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-25 00:06:20,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:20,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-25 00:06:20,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:06:20,018 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:20,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:20,047 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-11-25 00:06:20,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:06:20,048 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-25 00:06:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:20,049 INFO L225 Difference]: With dead ends: 29 [2023-11-25 00:06:20,049 INFO L226 Difference]: Without dead ends: 29 [2023-11-25 00:06:20,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-25 00:06:20,067 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:20,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 7 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:06:20,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-25 00:06:20,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-25 00:06:20,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:20,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2023-11-25 00:06:20,073 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2023-11-25 00:06:20,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:20,073 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2023-11-25 00:06:20,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:20,074 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2023-11-25 00:06:20,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-25 00:06:20,074 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:20,075 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:06:20,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-25 00:06:20,075 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:20,076 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:20,076 INFO L85 PathProgramCache]: Analyzing trace with hash -728760462, now seen corresponding path program 1 times [2023-11-25 00:06:20,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:20,077 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341760119] [2023-11-25 00:06:20,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:20,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:20,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:20,219 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:20,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:20,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341760119] [2023-11-25 00:06:20,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341760119] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:20,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966624154] [2023-11-25 00:06:20,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:20,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:20,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:20,221 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:20,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:06:20,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:20,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-25 00:06:20,297 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:20,321 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:20,322 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:20,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966624154] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:20,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455303224] [2023-11-25 00:06:20,399 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-25 00:06:20,399 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:20,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:20,400 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:20,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:20,731 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:20,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '606#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (exists ((|v_#valid_24| (Array Int Int)) (|v_ULTIMATE.start_main_~#A~0#1.base_18| Int)) (and (= (store |v_#valid_24| |v_ULTIMATE.start_main_~#A~0#1.base_18| 0) |#valid|) (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#A~0#1.base_18|) 0) 0) (= (select |v_#valid_24| |v_ULTIMATE.start_main_~#A~0#1.base_18|) 1) (<= 2 |v_ULTIMATE.start_main_~#A~0#1.base_18|) (<= 4 (select |#length| |v_ULTIMATE.start_main_~#A~0#1.base_18|)))))' at error location [2023-11-25 00:06:20,949 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:20,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:20,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-25 00:06:20,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563166772] [2023-11-25 00:06:20,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:20,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-25 00:06:20,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:20,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-25 00:06:20,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:06:20,952 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:21,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:21,100 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2023-11-25 00:06:21,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-25 00:06:21,100 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-25 00:06:21,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:21,102 INFO L225 Difference]: With dead ends: 117 [2023-11-25 00:06:21,102 INFO L226 Difference]: Without dead ends: 117 [2023-11-25 00:06:21,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:06:21,103 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 152 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:21,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 55 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:06:21,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-25 00:06:21,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 41. [2023-11-25 00:06:21,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 40 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:21,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-11-25 00:06:21,110 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 16 [2023-11-25 00:06:21,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:21,110 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-11-25 00:06:21,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:21,110 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-11-25 00:06:21,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-25 00:06:21,111 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:21,111 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:06:21,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:21,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:21,317 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:21,318 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:21,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1991550320, now seen corresponding path program 2 times [2023-11-25 00:06:21,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:21,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922223685] [2023-11-25 00:06:21,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:21,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:21,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:21,607 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:06:21,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:21,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922223685] [2023-11-25 00:06:21,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922223685] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:21,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118856889] [2023-11-25 00:06:21,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:06:21,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:21,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:21,610 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:21,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:06:21,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-25 00:06:21,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:21,684 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-25 00:06:21,687 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:21,858 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~#A~0#1.base_19| Int)) (and (= (select |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_main_~#A~0#1.base_19|) 0) (= |c_#valid| (store |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_main_~#A~0#1.base_19| 0)))) is different from true [2023-11-25 00:06:21,859 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-25 00:06:21,859 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:06:21,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118856889] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:06:21,859 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:06:21,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [12] total 14 [2023-11-25 00:06:21,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488146315] [2023-11-25 00:06:21,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:06:21,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-25 00:06:21,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:21,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-25 00:06:21,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=103, Unknown=1, NotChecked=24, Total=210 [2023-11-25 00:06:21,861 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:21,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:21,876 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2023-11-25 00:06:21,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:06:21,876 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2023-11-25 00:06:21,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:21,877 INFO L225 Difference]: With dead ends: 40 [2023-11-25 00:06:21,877 INFO L226 Difference]: Without dead ends: 36 [2023-11-25 00:06:21,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=103, Unknown=1, NotChecked=24, Total=210 [2023-11-25 00:06:21,878 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:21,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 5 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2023-11-25 00:06:21,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-25 00:06:21,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-11-25 00:06:21,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 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 00:06:21,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2023-11-25 00:06:21,883 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 28 [2023-11-25 00:06:21,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:21,883 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2023-11-25 00:06:21,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:21,884 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2023-11-25 00:06:21,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-25 00:06:21,885 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:21,885 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 4, 4, 4, 1, 1, 1] [2023-11-25 00:06:21,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:22,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:22,091 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:22,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:22,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1648148255, now seen corresponding path program 1 times [2023-11-25 00:06:22,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:22,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30956347] [2023-11-25 00:06:22,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:22,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:22,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:22,338 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-25 00:06:22,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:22,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30956347] [2023-11-25 00:06:22,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30956347] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:22,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753295383] [2023-11-25 00:06:22,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:22,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:22,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:22,341 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:22,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-25 00:06:22,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:22,447 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-25 00:06:22,451 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-25 00:06:22,499 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:22,751 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-25 00:06:22,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753295383] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:22,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689162661] [2023-11-25 00:06:22,755 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-25 00:06:22,755 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:22,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:22,756 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:22,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:23,040 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:23,176 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1173#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-25 00:06:23,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:23,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:23,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-25 00:06:23,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093625814] [2023-11-25 00:06:23,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:23,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-25 00:06:23,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:23,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-25 00:06:23,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=556, Unknown=0, NotChecked=0, Total=870 [2023-11-25 00:06:23,181 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:23,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:23,423 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2023-11-25 00:06:23,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-25 00:06:23,424 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-11-25 00:06:23,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:23,428 INFO L225 Difference]: With dead ends: 134 [2023-11-25 00:06:23,429 INFO L226 Difference]: Without dead ends: 134 [2023-11-25 00:06:23,429 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=314, Invalid=556, Unknown=0, NotChecked=0, Total=870 [2023-11-25 00:06:23,431 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 170 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:23,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 24 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:06:23,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-11-25 00:06:23,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 60. [2023-11-25 00:06:23,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 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 00:06:23,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2023-11-25 00:06:23,448 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 35 [2023-11-25 00:06:23,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:23,449 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2023-11-25 00:06:23,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:23,449 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2023-11-25 00:06:23,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-25 00:06:23,451 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:23,451 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 4, 4, 4, 1, 1, 1] [2023-11-25 00:06:23,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:23,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:23,662 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:23,662 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:23,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1033102885, now seen corresponding path program 2 times [2023-11-25 00:06:23,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:23,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098567254] [2023-11-25 00:06:23,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:23,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:23,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:24,558 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-25 00:06:24,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:24,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098567254] [2023-11-25 00:06:24,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098567254] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:24,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1134647865] [2023-11-25 00:06:24,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:06:24,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:24,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:24,560 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:24,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-25 00:06:24,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-25 00:06:24,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:24,669 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-25 00:06:24,674 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:24,848 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-11-25 00:06:24,849 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-11-25 00:06:25,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1134647865] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:25,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556346706] [2023-11-25 00:06:25,190 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-25 00:06:25,190 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:25,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:25,191 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:25,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:25,524 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:25,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1759#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-25 00:06:25,762 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:25,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:25,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 39 [2023-11-25 00:06:25,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626398085] [2023-11-25 00:06:25,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:25,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-11-25 00:06:25,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:25,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-11-25 00:06:25,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=1334, Unknown=0, NotChecked=0, Total=1892 [2023-11-25 00:06:25,767 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:27,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:27,131 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2023-11-25 00:06:27,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-25 00:06:27,131 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-11-25 00:06:27,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:27,133 INFO L225 Difference]: With dead ends: 135 [2023-11-25 00:06:27,133 INFO L226 Difference]: Without dead ends: 135 [2023-11-25 00:06:27,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1896 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1796, Invalid=4524, Unknown=0, NotChecked=0, Total=6320 [2023-11-25 00:06:27,136 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 254 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:27,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 32 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:06:27,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-25 00:06:27,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 80. [2023-11-25 00:06:27,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:27,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2023-11-25 00:06:27,162 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 59 [2023-11-25 00:06:27,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:27,162 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2023-11-25 00:06:27,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:27,163 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2023-11-25 00:06:27,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-11-25 00:06:27,173 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:27,174 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 10, 10, 10, 1, 1, 1] [2023-11-25 00:06:27,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:27,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-25 00:06:27,374 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:27,375 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:27,375 INFO L85 PathProgramCache]: Analyzing trace with hash 957492704, now seen corresponding path program 3 times [2023-11-25 00:06:27,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:27,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440510050] [2023-11-25 00:06:27,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:27,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:27,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:28,246 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:28,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:28,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440510050] [2023-11-25 00:06:28,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440510050] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:28,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115956879] [2023-11-25 00:06:28,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-25 00:06:28,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:28,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:28,248 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:28,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-25 00:06:29,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-25 00:06:29,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:29,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-25 00:06:29,019 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:29,107 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:29,107 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:30,068 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:30,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115956879] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:30,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358904751] [2023-11-25 00:06:30,071 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-25 00:06:30,071 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:30,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:30,072 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:30,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:30,328 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:30,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2592#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-25 00:06:30,520 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:30,520 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:30,520 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2023-11-25 00:06:30,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105931602] [2023-11-25 00:06:30,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:30,521 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-25 00:06:30,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:30,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-25 00:06:30,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1289, Invalid=1791, Unknown=0, NotChecked=0, Total=3080 [2023-11-25 00:06:30,525 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:31,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:31,193 INFO L93 Difference]: Finished difference Result 284 states and 285 transitions. [2023-11-25 00:06:31,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-25 00:06:31,194 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2023-11-25 00:06:31,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:31,196 INFO L225 Difference]: With dead ends: 284 [2023-11-25 00:06:31,196 INFO L226 Difference]: Without dead ends: 284 [2023-11-25 00:06:31,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1289, Invalid=1791, Unknown=0, NotChecked=0, Total=3080 [2023-11-25 00:06:31,199 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 477 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:31,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [477 Valid, 50 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:06:31,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2023-11-25 00:06:31,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 130. [2023-11-25 00:06:31,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 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 00:06:31,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2023-11-25 00:06:31,207 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 79 [2023-11-25 00:06:31,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:31,207 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2023-11-25 00:06:31,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:06:31,208 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2023-11-25 00:06:31,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-25 00:06:31,210 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:31,210 INFO L195 NwaCegarLoop]: trace histogram [48, 48, 10, 10, 10, 1, 1, 1] [2023-11-25 00:06:31,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:31,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:31,418 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:31,419 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:31,419 INFO L85 PathProgramCache]: Analyzing trace with hash -331086813, now seen corresponding path program 4 times [2023-11-25 00:06:31,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:31,419 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945722126] [2023-11-25 00:06:31,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:31,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:31,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:34,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:34,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:34,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945722126] [2023-11-25 00:06:34,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945722126] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:34,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022042149] [2023-11-25 00:06:34,433 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-25 00:06:34,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:34,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:34,435 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:34,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-25 00:06:34,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:34,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-25 00:06:34,692 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:34,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:34,890 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:38,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:38,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022042149] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:38,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1297447135] [2023-11-25 00:06:38,376 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-25 00:06:38,377 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:38,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:38,377 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:38,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:38,746 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:39,668 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3880#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~i~0#1| 1024))' at error location [2023-11-25 00:06:39,668 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:39,668 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:39,668 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2023-11-25 00:06:39,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520746632] [2023-11-25 00:06:39,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:39,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-11-25 00:06:39,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:39,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-11-25 00:06:39,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5062, Invalid=5858, Unknown=0, NotChecked=0, Total=10920 [2023-11-25 00:06:39,680 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 0 states have call successors, (0), 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 00:06:42,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:42,486 INFO L93 Difference]: Finished difference Result 584 states and 585 transitions. [2023-11-25 00:06:42,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-11-25 00:06:42,493 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 0 states have call successors, (0), 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 129 [2023-11-25 00:06:42,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:42,504 INFO L225 Difference]: With dead ends: 584 [2023-11-25 00:06:42,505 INFO L226 Difference]: Without dead ends: 584 [2023-11-25 00:06:42,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 312 SyntacticMatches, 20 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3761 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=5062, Invalid=5858, Unknown=0, NotChecked=0, Total=10920 [2023-11-25 00:06:42,509 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 1110 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1110 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:42,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1110 Valid, 100 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-25 00:06:42,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2023-11-25 00:06:42,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 230. [2023-11-25 00:06:42,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 0 states have call successors, (0), 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 00:06:42,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2023-11-25 00:06:42,533 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 129 [2023-11-25 00:06:42,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:42,536 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2023-11-25 00:06:42,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 0 states have call successors, (0), 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 00:06:42,536 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2023-11-25 00:06:42,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2023-11-25 00:06:42,548 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:42,548 INFO L195 NwaCegarLoop]: trace histogram [98, 98, 10, 10, 10, 1, 1, 1] [2023-11-25 00:06:42,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:42,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:42,755 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-25 00:06:42,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:42,755 INFO L85 PathProgramCache]: Analyzing trace with hash -280970135, now seen corresponding path program 5 times [2023-11-25 00:06:42,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:42,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383777729] [2023-11-25 00:06:42,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:42,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:42,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:52,284 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 0 proven. 9604 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-25 00:06:52,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:52,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383777729] [2023-11-25 00:06:52,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383777729] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:52,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075835368] [2023-11-25 00:06:52,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:06:52,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:52,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:52,287 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:52,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40b2cc22-8aab-473d-a297-a9a3f3a36e6c/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-25 00:06:52,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-25 00:06:52,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:52,592 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-25 00:06:52,601 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:52,984 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2023-11-25 00:06:52,984 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:54,312 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2023-11-25 00:06:54,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075835368] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:54,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1552322857] [2023-11-25 00:06:54,314 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-25 00:06:54,315 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:54,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:54,315 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:54,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:54,585 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:56,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6193#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~i~0#1| 1024))' at error location [2023-11-25 00:06:56,319 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:56,319 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:56,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 14, 14] total 127 [2023-11-25 00:06:56,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396704175] [2023-11-25 00:06:56,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:56,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2023-11-25 00:06:56,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:56,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2023-11-25 00:06:56,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6591, Invalid=10439, Unknown=0, NotChecked=0, Total=17030 [2023-11-25 00:06:56,330 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 127 states, 127 states have (on average 2.1338582677165356) internal successors, (271), 127 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)