./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX --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 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 01:02:02,103 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 01:02:02,215 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 01:02:02,226 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 01:02:02,226 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 01:02:02,268 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 01:02:02,268 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 01:02:02,269 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 01:02:02,270 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 01:02:02,275 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 01:02:02,275 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 01:02:02,276 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 01:02:02,276 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 01:02:02,278 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 01:02:02,278 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 01:02:02,279 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 01:02:02,279 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 01:02:02,279 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 01:02:02,280 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 01:02:02,280 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 01:02:02,281 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 01:02:02,281 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 01:02:02,282 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 01:02:02,282 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 01:02:02,283 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 01:02:02,284 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 01:02:02,284 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 01:02:02,284 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 01:02:02,285 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 01:02:02,285 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 01:02:02,287 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 01:02:02,287 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 01:02:02,287 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 01:02:02,287 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 01:02:02,287 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 01:02:02,288 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 01:02:02,288 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 01:02:02,288 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 01:02:02,288 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 01:02:02,289 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:02:02,289 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 01:02:02,289 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 01:02:02,289 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 01:02:02,290 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 01:02:02,290 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 01:02:02,290 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 01:02:02,291 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_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2023-11-12 01:02:02,639 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 01:02:02,670 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 01:02:02,673 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 01:02:02,674 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 01:02:02,675 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 01:02:02,676 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2023-11-12 01:02:05,890 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 01:02:06,195 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 01:02:06,195 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2023-11-12 01:02:06,211 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/data/3d8e6b88d/ab0bb571222344979e2820aace580943/FLAGef637a87e [2023-11-12 01:02:06,227 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/data/3d8e6b88d/ab0bb571222344979e2820aace580943 [2023-11-12 01:02:06,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 01:02:06,231 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 01:02:06,232 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 01:02:06,233 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 01:02:06,238 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 01:02:06,239 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,240 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@333ae5c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06, skipping insertion in model container [2023-11-12 01:02:06,240 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,303 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 01:02:06,651 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:02:06,663 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 01:02:06,745 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:02:06,792 INFO L206 MainTranslator]: Completed translation [2023-11-12 01:02:06,793 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06 WrapperNode [2023-11-12 01:02:06,793 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 01:02:06,794 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 01:02:06,794 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 01:02:06,795 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 01:02:06,802 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,818 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,847 INFO L138 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 165 [2023-11-12 01:02:06,847 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 01:02:06,848 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 01:02:06,848 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 01:02:06,849 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 01:02:06,859 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,859 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,864 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,865 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,873 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,878 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,881 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,882 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,886 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 01:02:06,887 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 01:02:06,887 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 01:02:06,887 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 01:02:06,888 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (1/1) ... [2023-11-12 01:02:06,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:02:06,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:06,921 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 01:02:06,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 01:02:06,970 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 01:02:06,971 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 01:02:06,971 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 01:02:06,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 01:02:06,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 01:02:06,972 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 01:02:07,112 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 01:02:07,117 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 01:02:07,442 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 01:02:07,584 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 01:02:07,584 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-12 01:02:07,587 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:02:07 BoogieIcfgContainer [2023-11-12 01:02:07,587 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 01:02:07,590 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 01:02:07,590 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 01:02:07,599 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 01:02:07,599 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 01:02:06" (1/3) ... [2023-11-12 01:02:07,600 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59fc594f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:02:07, skipping insertion in model container [2023-11-12 01:02:07,600 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:06" (2/3) ... [2023-11-12 01:02:07,600 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59fc594f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:02:07, skipping insertion in model container [2023-11-12 01:02:07,601 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:02:07" (3/3) ... [2023-11-12 01:02:07,602 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2023-11-12 01:02:07,625 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 01:02:07,625 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2023-11-12 01:02:07,674 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 01:02:07,680 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;@424d9029, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 01:02:07,680 INFO L358 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2023-11-12 01:02:07,685 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:07,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 01:02:07,690 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:07,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 01:02:07,692 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:07,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:07,697 INFO L85 PathProgramCache]: Analyzing trace with hash 222729, now seen corresponding path program 1 times [2023-11-12 01:02:07,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:07,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387984660] [2023-11-12 01:02:07,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:07,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:07,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:08,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:08,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:08,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387984660] [2023-11-12 01:02:08,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387984660] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:08,103 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:08,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 01:02:08,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336029077] [2023-11-12 01:02:08,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:08,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:02:08,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:08,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:02:08,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 01:02:08,142 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2023-11-12 01:02:08,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:08,223 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2023-11-12 01:02:08,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:02:08,226 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 [2023-11-12 01:02:08,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:08,235 INFO L225 Difference]: With dead ends: 58 [2023-11-12 01:02:08,235 INFO L226 Difference]: Without dead ends: 57 [2023-11-12 01:02:08,237 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 [2023-11-12 01:02:08,241 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:08,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:08,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-12 01:02:08,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-12 01:02:08,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:08,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-12 01:02:08,283 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2023-11-12 01:02:08,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:08,284 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-12 01:02:08,284 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) [2023-11-12 01:02:08,286 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-12 01:02:08,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 01:02:08,288 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:08,289 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 01:02:08,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 01:02:08,290 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:08,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:08,292 INFO L85 PathProgramCache]: Analyzing trace with hash 222730, now seen corresponding path program 1 times [2023-11-12 01:02:08,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:08,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813909093] [2023-11-12 01:02:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:08,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:08,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:08,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:08,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:08,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813909093] [2023-11-12 01:02:08,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813909093] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:08,700 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:08,700 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 01:02:08,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140356781] [2023-11-12 01:02:08,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:08,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 01:02:08,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:08,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 01:02:08,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:08,706 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2023-11-12 01:02:08,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:08,875 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2023-11-12 01:02:08,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:02:08,876 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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 [2023-11-12 01:02:08,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:08,878 INFO L225 Difference]: With dead ends: 59 [2023-11-12 01:02:08,878 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 01:02:08,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:08,886 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:08,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:08,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 01:02:08,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-12 01:02:08,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:08,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2023-11-12 01:02:08,900 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 3 [2023-11-12 01:02:08,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:08,900 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2023-11-12 01:02:08,901 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2023-11-12 01:02:08,901 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2023-11-12 01:02:08,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 01:02:08,901 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:08,901 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 01:02:08,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 01:02:08,902 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:08,903 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:08,903 INFO L85 PathProgramCache]: Analyzing trace with hash 7082004, now seen corresponding path program 1 times [2023-11-12 01:02:08,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:08,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293870773] [2023-11-12 01:02:08,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:08,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:08,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:09,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:09,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:09,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293870773] [2023-11-12 01:02:09,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293870773] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:09,045 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:09,045 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 01:02:09,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633559584] [2023-11-12 01:02:09,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:09,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:02:09,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:09,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:02:09,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 01:02:09,049 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:09,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:09,116 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2023-11-12 01:02:09,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:02:09,117 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 01:02:09,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:09,118 INFO L225 Difference]: With dead ends: 59 [2023-11-12 01:02:09,118 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 01:02:09,119 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 [2023-11-12 01:02:09,120 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:09,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 101 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:02:09,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 01:02:09,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-12 01:02:09,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 58 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:09,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2023-11-12 01:02:09,131 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 4 [2023-11-12 01:02:09,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:09,131 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2023-11-12 01:02:09,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2023-11-12 01:02:09,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 01:02:09,132 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:09,132 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-12 01:02:09,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 01:02:09,133 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:09,133 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:09,134 INFO L85 PathProgramCache]: Analyzing trace with hash 214199951, now seen corresponding path program 1 times [2023-11-12 01:02:09,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:09,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787845063] [2023-11-12 01:02:09,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:09,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:09,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:09,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:09,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:09,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787845063] [2023-11-12 01:02:09,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787845063] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:09,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840125567] [2023-11-12 01:02:09,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:09,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:09,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:09,429 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:09,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 01:02:09,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:09,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-12 01:02:09,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:09,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 01:02:09,651 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-12 01:02:09,662 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 01:02:09,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:09,902 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:10,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:10,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840125567] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:10,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914002495] [2023-11-12 01:02:10,084 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-12 01:02:10,084 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:10,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:10,096 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:10,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:11,264 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:11,489 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '461#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet25#1|)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_#t~nondet25#1| 127) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|))' at error location [2023-11-12 01:02:11,489 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:11,489 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:11,490 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-11-12 01:02:11,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981019863] [2023-11-12 01:02:11,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:11,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 01:02:11,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:11,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 01:02:11,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-11-12 01:02:11,492 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:11,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:11,798 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2023-11-12 01:02:11,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 01:02:11,799 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-12 01:02:11,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:11,800 INFO L225 Difference]: With dead ends: 58 [2023-11-12 01:02:11,800 INFO L226 Difference]: Without dead ends: 58 [2023-11-12 01:02:11,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2023-11-12 01:02:11,802 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:11,803 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 195 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:02:11,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-12 01:02:11,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2023-11-12 01:02:11,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:11,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-12 01:02:11,809 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 5 [2023-11-12 01:02:11,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:11,810 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-12 01:02:11,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:11,810 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-12 01:02:11,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 01:02:11,811 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:11,811 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 01:02:11,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 01:02:12,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:12,018 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:12,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:12,019 INFO L85 PathProgramCache]: Analyzing trace with hash -1949558737, now seen corresponding path program 1 times [2023-11-12 01:02:12,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:12,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699810660] [2023-11-12 01:02:12,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:12,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:12,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:12,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:12,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:12,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699810660] [2023-11-12 01:02:12,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699810660] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:12,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825969983] [2023-11-12 01:02:12,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:12,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:12,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:12,132 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:12,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 01:02:12,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:12,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 01:02:12,218 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:12,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:12,329 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:12,413 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-12 01:02:12,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:12,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825969983] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:12,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536109477] [2023-11-12 01:02:12,490 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 01:02:12,491 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:12,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:12,492 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:12,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:13,701 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:13,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '627#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_main_~length2~0#1| 0) (<= 1 |#StackHeapBarrier|) (or (< |ULTIMATE.start_main_~length1~0#1| 1) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~length1~0#1|)) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|))' at error location [2023-11-12 01:02:13,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:13,959 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:13,959 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-11-12 01:02:13,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155381310] [2023-11-12 01:02:13,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:13,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 01:02:13,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:13,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 01:02:13,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2023-11-12 01:02:13,967 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:14,191 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2023-11-12 01:02:14,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 01:02:14,192 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 01:02:14,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:14,193 INFO L225 Difference]: With dead ends: 57 [2023-11-12 01:02:14,193 INFO L226 Difference]: Without dead ends: 57 [2023-11-12 01:02:14,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2023-11-12 01:02:14,194 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 68 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:14,194 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 216 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:14,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-12 01:02:14,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2023-11-12 01:02:14,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2023-11-12 01:02:14,200 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 6 [2023-11-12 01:02:14,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:14,200 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2023-11-12 01:02:14,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,201 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2023-11-12 01:02:14,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 01:02:14,201 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:14,201 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 01:02:14,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:14,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:14,406 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:14,407 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:14,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1949563584, now seen corresponding path program 1 times [2023-11-12 01:02:14,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:14,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387325533] [2023-11-12 01:02:14,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:14,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:14,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:14,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:14,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387325533] [2023-11-12 01:02:14,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387325533] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:14,499 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:14,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 01:02:14,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353611090] [2023-11-12 01:02:14,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:14,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:02:14,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:14,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:02:14,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 01:02:14,501 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:14,558 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2023-11-12 01:02:14,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:02:14,559 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 01:02:14,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:14,560 INFO L225 Difference]: With dead ends: 54 [2023-11-12 01:02:14,560 INFO L226 Difference]: Without dead ends: 54 [2023-11-12 01:02:14,560 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 [2023-11-12 01:02:14,561 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 56 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:14,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 34 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:14,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-12 01:02:14,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2023-11-12 01:02:14,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2023-11-12 01:02:14,577 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 6 [2023-11-12 01:02:14,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:14,578 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2023-11-12 01:02:14,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:14,578 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2023-11-12 01:02:14,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 01:02:14,579 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:14,579 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 01:02:14,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 01:02:14,579 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:14,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:14,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1949563583, now seen corresponding path program 1 times [2023-11-12 01:02:14,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:14,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498088512] [2023-11-12 01:02:14,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:14,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:14,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:14,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:14,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:14,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498088512] [2023-11-12 01:02:14,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498088512] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:14,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420413130] [2023-11-12 01:02:14,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:14,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:14,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:14,787 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:14,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 01:02:14,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:14,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-12 01:02:14,876 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:14,899 INFO L351 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 7 [2023-11-12 01:02:14,909 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 01:02:15,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:15,047 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:02:15,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420413130] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:15,048 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:02:15,048 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 7 [2023-11-12 01:02:15,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424340139] [2023-11-12 01:02:15,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:15,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 01:02:15,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:15,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 01:02:15,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2023-11-12 01:02:15,050 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:15,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:15,191 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2023-11-12 01:02:15,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:02:15,193 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 01:02:15,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:15,194 INFO L225 Difference]: With dead ends: 55 [2023-11-12 01:02:15,194 INFO L226 Difference]: Without dead ends: 55 [2023-11-12 01:02:15,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2023-11-12 01:02:15,195 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 60 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:15,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 102 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:15,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-12 01:02:15,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-11-12 01:02:15,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 37 states have (on average 1.7567567567567568) internal successors, (65), 54 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:15,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2023-11-12 01:02:15,207 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 6 [2023-11-12 01:02:15,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:15,207 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2023-11-12 01:02:15,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:15,208 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2023-11-12 01:02:15,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 01:02:15,208 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:15,208 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:15,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:15,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:15,409 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:15,409 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:15,410 INFO L85 PathProgramCache]: Analyzing trace with hash -924718664, now seen corresponding path program 1 times [2023-11-12 01:02:15,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:15,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598037060] [2023-11-12 01:02:15,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:15,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:15,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:15,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:15,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598037060] [2023-11-12 01:02:15,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598037060] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:15,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574298074] [2023-11-12 01:02:15,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:15,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:15,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:15,629 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:15,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 01:02:15,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:15,710 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-12 01:02:15,712 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:15,731 INFO L351 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 7 [2023-11-12 01:02:15,739 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 01:02:15,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:15,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:16,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:16,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574298074] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:16,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [904014941] [2023-11-12 01:02:16,150 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 01:02:16,151 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:16,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:16,151 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:16,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:16,964 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:17,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1052#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet27#1| 127) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet27#1|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|))' at error location [2023-11-12 01:02:17,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:17,321 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:17,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-11-12 01:02:17,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822887031] [2023-11-12 01:02:17,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:17,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 01:02:17,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:17,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 01:02:17,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2023-11-12 01:02:17,323 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2023-11-12 01:02:17,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:17,594 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2023-11-12 01:02:17,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 01:02:17,595 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 01:02:17,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:17,595 INFO L225 Difference]: With dead ends: 56 [2023-11-12 01:02:17,595 INFO L226 Difference]: Without dead ends: 56 [2023-11-12 01:02:17,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2023-11-12 01:02:17,597 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 61 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:17,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 170 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:17,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-12 01:02:17,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2023-11-12 01:02:17,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.75) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:17,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2023-11-12 01:02:17,602 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 8 [2023-11-12 01:02:17,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:17,602 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2023-11-12 01:02:17,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2023-11-12 01:02:17,603 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2023-11-12 01:02:17,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 01:02:17,603 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:17,604 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:17,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:17,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:17,818 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:17,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:17,819 INFO L85 PathProgramCache]: Analyzing trace with hash 408255233, now seen corresponding path program 1 times [2023-11-12 01:02:17,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:17,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563624155] [2023-11-12 01:02:17,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:17,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:17,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:17,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:17,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:17,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563624155] [2023-11-12 01:02:17,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563624155] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:17,872 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:17,872 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 01:02:17,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335263795] [2023-11-12 01:02:17,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:17,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 01:02:17,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:17,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 01:02:17,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:17,874 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) 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) [2023-11-12 01:02:17,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:17,971 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2023-11-12 01:02:17,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:02:17,972 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) 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 10 [2023-11-12 01:02:17,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:17,974 INFO L225 Difference]: With dead ends: 52 [2023-11-12 01:02:17,974 INFO L226 Difference]: Without dead ends: 52 [2023-11-12 01:02:17,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:17,977 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:17,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 63 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:17,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-12 01:02:17,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-12 01:02:17,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:17,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2023-11-12 01:02:17,985 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2023-11-12 01:02:17,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:17,985 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2023-11-12 01:02:17,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) 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) [2023-11-12 01:02:17,985 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2023-11-12 01:02:17,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 01:02:17,986 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:17,986 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:17,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 01:02:17,986 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:17,987 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:17,987 INFO L85 PathProgramCache]: Analyzing trace with hash 408255234, now seen corresponding path program 1 times [2023-11-12 01:02:17,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:17,987 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155835005] [2023-11-12 01:02:17,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:17,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:18,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:18,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:18,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:18,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155835005] [2023-11-12 01:02:18,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155835005] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:18,241 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:18,241 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 01:02:18,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394433447] [2023-11-12 01:02:18,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:18,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 01:02:18,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:18,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 01:02:18,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:18,243 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 5 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) [2023-11-12 01:02:18,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:18,314 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-11-12 01:02:18,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:02:18,316 INFO L78 Accepts]: Start accepts. Automaton has has 5 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 10 [2023-11-12 01:02:18,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:18,316 INFO L225 Difference]: With dead ends: 51 [2023-11-12 01:02:18,316 INFO L226 Difference]: Without dead ends: 51 [2023-11-12 01:02:18,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:02:18,317 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 56 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:18,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 65 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:18,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-12 01:02:18,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-12 01:02:18,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 50 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) [2023-11-12 01:02:18,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-11-12 01:02:18,321 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2023-11-12 01:02:18,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:18,321 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-11-12 01:02:18,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 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) [2023-11-12 01:02:18,321 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-11-12 01:02:18,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 01:02:18,322 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:18,322 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:18,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-12 01:02:18,322 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:18,323 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:18,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1491372382, now seen corresponding path program 1 times [2023-11-12 01:02:18,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:18,323 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309525048] [2023-11-12 01:02:18,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:18,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:18,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:18,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:18,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:18,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309525048] [2023-11-12 01:02:18,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309525048] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:18,413 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:18,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 01:02:18,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497225487] [2023-11-12 01:02:18,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:18,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 01:02:18,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:18,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 01:02:18,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:18,415 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 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) [2023-11-12 01:02:18,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:18,482 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2023-11-12 01:02:18,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 01:02:18,483 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 01:02:18,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:18,484 INFO L225 Difference]: With dead ends: 50 [2023-11-12 01:02:18,484 INFO L226 Difference]: Without dead ends: 50 [2023-11-12 01:02:18,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-12 01:02:18,486 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 101 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:18,487 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 60 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:18,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-12 01:02:18,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-12 01:02:18,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:18,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-11-12 01:02:18,490 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2023-11-12 01:02:18,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:18,491 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-11-12 01:02:18,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 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) [2023-11-12 01:02:18,491 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-11-12 01:02:18,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 01:02:18,492 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:18,492 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:18,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 01:02:18,493 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:18,493 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:18,493 INFO L85 PathProgramCache]: Analyzing trace with hash 1491372383, now seen corresponding path program 1 times [2023-11-12 01:02:18,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:18,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656532365] [2023-11-12 01:02:18,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:18,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:18,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:18,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:18,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656532365] [2023-11-12 01:02:18,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656532365] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:18,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754652538] [2023-11-12 01:02:18,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:18,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:18,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:18,941 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:18,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 01:02:19,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:19,032 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 01:02:19,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:19,094 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 01:02:19,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:19,112 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:19,121 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2023-11-12 01:02:19,124 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2023-11-12 01:02:19,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:19,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754652538] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:19,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1926252419] [2023-11-12 01:02:19,175 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 01:02:19,175 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:19,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:19,176 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:19,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:20,139 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:21,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1926252419] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:21,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:21,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 25 [2023-11-12 01:02:21,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68772056] [2023-11-12 01:02:21,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:21,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 01:02:21,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:21,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 01:02:21,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2023-11-12 01:02:21,117 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2023-11-12 01:02:21,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:21,495 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2023-11-12 01:02:21,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 01:02:21,496 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 01:02:21,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:21,498 INFO L225 Difference]: With dead ends: 53 [2023-11-12 01:02:21,498 INFO L226 Difference]: Without dead ends: 53 [2023-11-12 01:02:21,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2023-11-12 01:02:21,501 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 98 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:21,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 98 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 190 Invalid, 1 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 01:02:21,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-12 01:02:21,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2023-11-12 01:02:21,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 50 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) [2023-11-12 01:02:21,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-11-12 01:02:21,517 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2023-11-12 01:02:21,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:21,517 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-11-12 01:02:21,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2023-11-12 01:02:21,518 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-11-12 01:02:21,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 01:02:21,519 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:21,519 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:21,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:21,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:21,725 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:21,726 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:21,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1310212855, now seen corresponding path program 1 times [2023-11-12 01:02:21,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:21,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559545018] [2023-11-12 01:02:21,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:21,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:21,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:22,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:22,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:22,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559545018] [2023-11-12 01:02:22,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559545018] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:22,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587683488] [2023-11-12 01:02:22,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:22,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:22,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:22,495 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:22,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 01:02:22,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:22,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-12 01:02:22,596 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:22,759 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 01:02:22,816 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 01:02:22,819 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 01:02:22,819 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 10 [2023-11-12 01:02:22,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 01:02:22,846 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:22,889 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2023-11-12 01:02:22,893 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2023-11-12 01:02:23,155 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 01:02:23,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587683488] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:23,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [621924162] [2023-11-12 01:02:23,157 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:23,158 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:23,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:23,158 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:23,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:24,568 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:25,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1797#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-12 01:02:25,911 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:25,911 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:25,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2023-11-12 01:02:25,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167878834] [2023-11-12 01:02:25,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:25,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 01:02:25,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:25,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 01:02:25,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1009, Unknown=2, NotChecked=0, Total=1122 [2023-11-12 01:02:25,914 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:26,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:26,872 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2023-11-12 01:02:26,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 01:02:26,872 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 01:02:26,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:26,873 INFO L225 Difference]: With dead ends: 64 [2023-11-12 01:02:26,874 INFO L226 Difference]: Without dead ends: 64 [2023-11-12 01:02:26,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=210, Invalid=1594, Unknown=2, NotChecked=0, Total=1806 [2023-11-12 01:02:26,876 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 104 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:26,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 456 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 01:02:26,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-12 01:02:26,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2023-11-12 01:02:26,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 56 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:26,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2023-11-12 01:02:26,881 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2023-11-12 01:02:26,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:26,881 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2023-11-12 01:02:26,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:26,882 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2023-11-12 01:02:26,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 01:02:26,883 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:26,883 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:26,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:27,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:27,089 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:27,090 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:27,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1306986115, now seen corresponding path program 1 times [2023-11-12 01:02:27,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:27,090 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367539342] [2023-11-12 01:02:27,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:27,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:27,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:27,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 01:02:27,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:27,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367539342] [2023-11-12 01:02:27,334 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367539342] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:27,334 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:27,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 01:02:27,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787342432] [2023-11-12 01:02:27,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:27,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 01:02:27,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:27,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 01:02:27,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:27,336 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:27,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:27,410 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2023-11-12 01:02:27,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:02:27,410 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 01:02:27,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:27,411 INFO L225 Difference]: With dead ends: 56 [2023-11-12 01:02:27,411 INFO L226 Difference]: Without dead ends: 48 [2023-11-12 01:02:27,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:27,412 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:27,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 64 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:27,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-12 01:02:27,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-11-12 01:02:27,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.6) internal successors, (56), 47 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:27,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2023-11-12 01:02:27,416 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2023-11-12 01:02:27,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:27,416 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2023-11-12 01:02:27,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:27,417 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2023-11-12 01:02:27,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 01:02:27,418 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:27,418 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:27,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 01:02:27,418 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:27,419 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:27,419 INFO L85 PathProgramCache]: Analyzing trace with hash -391562624, now seen corresponding path program 2 times [2023-11-12 01:02:27,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:27,419 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594592043] [2023-11-12 01:02:27,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:27,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:27,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:27,921 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:27,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:27,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594592043] [2023-11-12 01:02:27,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594592043] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:27,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107691893] [2023-11-12 01:02:27,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:02:27,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:27,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:27,923 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:27,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 01:02:28,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 01:02:28,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:02:28,022 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-12 01:02:28,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:28,056 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 01:02:28,228 INFO L322 Elim1Store]: treesize reduction 4, result has 76.5 percent of original size [2023-11-12 01:02:28,228 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 23 [2023-11-12 01:02:28,287 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 01:02:28,287 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:28,501 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2023-11-12 01:02:28,508 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-11-12 01:02:28,528 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 23 [2023-11-12 01:02:28,594 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 01:02:28,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107691893] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:28,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388536468] [2023-11-12 01:02:28,600 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:28,600 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:28,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:28,601 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:28,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:29,908 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:31,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2168#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-12 01:02:31,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:31,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:31,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 23 [2023-11-12 01:02:31,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445438427] [2023-11-12 01:02:31,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:31,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 01:02:31,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:31,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 01:02:31,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=972, Unknown=2, NotChecked=0, Total=1122 [2023-11-12 01:02:31,178 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:32,319 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2023-11-12 01:02:32,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-12 01:02:32,320 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 01:02:32,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:32,322 INFO L225 Difference]: With dead ends: 92 [2023-11-12 01:02:32,322 INFO L226 Difference]: Without dead ends: 92 [2023-11-12 01:02:32,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=330, Invalid=1830, Unknown=2, NotChecked=0, Total=2162 [2023-11-12 01:02:32,327 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 473 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 473 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:32,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [473 Valid, 248 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 01:02:32,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-12 01:02:32,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 58. [2023-11-12 01:02:32,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 45 states have (on average 1.511111111111111) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2023-11-12 01:02:32,339 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2023-11-12 01:02:32,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:32,339 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2023-11-12 01:02:32,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,340 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2023-11-12 01:02:32,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 01:02:32,341 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:32,341 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:32,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:32,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-12 01:02:32,548 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:32,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:32,548 INFO L85 PathProgramCache]: Analyzing trace with hash -12008611, now seen corresponding path program 1 times [2023-11-12 01:02:32,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:32,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556649242] [2023-11-12 01:02:32,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:32,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:32,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:32,674 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:32,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:32,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556649242] [2023-11-12 01:02:32,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556649242] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:32,675 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:32,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 01:02:32,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398386399] [2023-11-12 01:02:32,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:32,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 01:02:32,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:32,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 01:02:32,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:32,678 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:32,742 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2023-11-12 01:02:32,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 01:02:32,743 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-12 01:02:32,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:32,745 INFO L225 Difference]: With dead ends: 57 [2023-11-12 01:02:32,745 INFO L226 Difference]: Without dead ends: 57 [2023-11-12 01:02:32,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-12 01:02:32,747 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 79 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:32,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 49 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:02:32,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-12 01:02:32,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-12 01:02:32,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.488888888888889) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-12 01:02:32,752 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2023-11-12 01:02:32,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:32,753 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-12 01:02:32,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:32,753 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-12 01:02:32,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 01:02:32,755 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:32,755 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:32,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-12 01:02:32,756 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:32,756 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:32,756 INFO L85 PathProgramCache]: Analyzing trace with hash -12008610, now seen corresponding path program 1 times [2023-11-12 01:02:32,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:32,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095980090] [2023-11-12 01:02:32,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:32,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:32,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:32,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:32,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:32,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095980090] [2023-11-12 01:02:32,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095980090] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:32,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313135291] [2023-11-12 01:02:32,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:32,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:32,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:32,935 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:32,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 01:02:33,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:33,050 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 01:02:33,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:33,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:33,144 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:33,212 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-12 01:02:33,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:33,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313135291] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:33,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [522131773] [2023-11-12 01:02:33,224 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-12 01:02:33,224 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:33,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:33,225 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:33,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:34,083 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:35,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2593#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_cstrstr_#in~find#1.offset|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_cstrstr_#in~s#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_cstrstr_~find#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~find#1.offset|)) |ULTIMATE.start_cstrstr_~c~0#1|) (<= (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|)) (or (< |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1))) (= (select |#valid| |ULTIMATE.start_main_~nondetString1~0#1.base|) 1) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |ULTIMATE.start_cstrlen_#res#1| 0) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|)) (<= (+ |ULTIMATE.start_cstrstr_~find#1.offset| 1) (select |#length| |ULTIMATE.start_cstrstr_~find#1.base|)) (not (= |ULTIMATE.start_cstrstr_~c~0#1| 0)) (= |ULTIMATE.start_cstrstr_~find#1.offset| (+ |ULTIMATE.start_cstrstr_#in~find#1.offset| 1)) (= |ULTIMATE.start_cstrstr_#in~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) (= |ULTIMATE.start_cstrstr_#in~s#1.base| |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.base| |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrstr_~len~0#1| 0) (= |ULTIMATE.start_cstrstr_#in~find#1.base| |ULTIMATE.start_cstrstr_~find#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrstr_~find#1.base|) |ULTIMATE.start_cstrstr_~find#1.offset|) 0) (= (select |#valid| |ULTIMATE.start_main_~nondetString2~0#1.base|) 1) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (exists ((|v_#memory_int_123| (Array Int (Array Int Int)))) (= |#memory_int| (store (store |v_#memory_int_123| |ULTIMATE.start_main_~nondetString1~0#1.base| (store (select |v_#memory_int_123| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|) 0)) |ULTIMATE.start_main_~nondetString2~0#1.base| (store (select (store |v_#memory_int_123| |ULTIMATE.start_main_~nondetString1~0#1.base| (store (select |v_#memory_int_123| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|) 0)) |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)))))' at error location [2023-11-12 01:02:35,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:35,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:35,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2023-11-12 01:02:35,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129850346] [2023-11-12 01:02:35,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:35,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 01:02:35,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:35,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 01:02:35,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2023-11-12 01:02:35,655 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:35,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:35,833 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2023-11-12 01:02:35,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 01:02:35,834 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-12 01:02:35,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:35,834 INFO L225 Difference]: With dead ends: 61 [2023-11-12 01:02:35,834 INFO L226 Difference]: Without dead ends: 61 [2023-11-12 01:02:35,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2023-11-12 01:02:35,836 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 51 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:35,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 88 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:35,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-12 01:02:35,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2023-11-12 01:02:35,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:35,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2023-11-12 01:02:35,839 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 19 [2023-11-12 01:02:35,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:35,839 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2023-11-12 01:02:35,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:35,839 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2023-11-12 01:02:35,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 01:02:35,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:35,840 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:35,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:36,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-12 01:02:36,048 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:36,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:36,048 INFO L85 PathProgramCache]: Analyzing trace with hash 965514209, now seen corresponding path program 3 times [2023-11-12 01:02:36,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:36,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019255240] [2023-11-12 01:02:36,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:36,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:36,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:36,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:36,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019255240] [2023-11-12 01:02:36,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019255240] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:36,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093529671] [2023-11-12 01:02:36,669 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 01:02:36,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:36,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:36,670 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:36,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 01:02:36,803 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 01:02:36,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:02:36,805 INFO L262 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-12 01:02:36,807 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:36,965 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 01:02:36,981 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:36,981 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:37,002 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-12 01:02:37,004 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-12 01:02:37,078 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:37,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093529671] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:37,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575824686] [2023-11-12 01:02:37,080 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:37,081 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:37,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:37,081 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:37,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:38,242 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:39,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2871#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-12 01:02:39,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:39,498 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:39,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2023-11-12 01:02:39,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439330469] [2023-11-12 01:02:39,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:39,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-12 01:02:39,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:39,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-12 01:02:39,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=883, Unknown=2, NotChecked=0, Total=992 [2023-11-12 01:02:39,500 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) [2023-11-12 01:02:40,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:40,087 INFO L93 Difference]: Finished difference Result 105 states and 122 transitions. [2023-11-12 01:02:40,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-12 01:02:40,087 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-12 01:02:40,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:40,088 INFO L225 Difference]: With dead ends: 105 [2023-11-12 01:02:40,088 INFO L226 Difference]: Without dead ends: 105 [2023-11-12 01:02:40,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=220, Invalid=1584, Unknown=2, NotChecked=0, Total=1806 [2023-11-12 01:02:40,090 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 277 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:40,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 748 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 01:02:40,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-12 01:02:40,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 68. [2023-11-12 01:02:40,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.4285714285714286) internal successors, (80), 67 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:40,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2023-11-12 01:02:40,095 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 20 [2023-11-12 01:02:40,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:40,095 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2023-11-12 01:02:40,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) [2023-11-12 01:02:40,095 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2023-11-12 01:02:40,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-12 01:02:40,096 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:40,096 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:40,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:40,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-12 01:02:40,297 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:40,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:40,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1652433896, now seen corresponding path program 4 times [2023-11-12 01:02:40,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:40,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149329477] [2023-11-12 01:02:40,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:40,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:40,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:40,663 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:40,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:40,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149329477] [2023-11-12 01:02:40,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149329477] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:40,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075418669] [2023-11-12 01:02:40,663 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 01:02:40,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:40,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:40,665 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:40,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 01:02:40,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:40,777 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-12 01:02:40,780 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:40,904 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:40,904 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:41,061 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-12 01:02:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:41,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075418669] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:41,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532416707] [2023-11-12 01:02:41,113 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:41,113 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:41,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:41,114 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:41,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:42,127 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:43,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3226#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-12 01:02:43,365 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:43,365 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:43,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 23 [2023-11-12 01:02:43,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786498156] [2023-11-12 01:02:43,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:43,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 01:02:43,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:43,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 01:02:43,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=993, Unknown=2, NotChecked=0, Total=1122 [2023-11-12 01:02:43,368 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 24 states, 23 states have (on average 2.130434782608696) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:44,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:44,090 INFO L93 Difference]: Finished difference Result 108 states and 127 transitions. [2023-11-12 01:02:44,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-12 01:02:44,091 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.130434782608696) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-12 01:02:44,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:44,092 INFO L225 Difference]: With dead ends: 108 [2023-11-12 01:02:44,092 INFO L226 Difference]: Without dead ends: 108 [2023-11-12 01:02:44,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=232, Invalid=1572, Unknown=2, NotChecked=0, Total=1806 [2023-11-12 01:02:44,093 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 319 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:44,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 491 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 01:02:44,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-11-12 01:02:44,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 70. [2023-11-12 01:02:44,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 58 states have (on average 1.4310344827586208) internal successors, (83), 69 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) [2023-11-12 01:02:44,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2023-11-12 01:02:44,097 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 22 [2023-11-12 01:02:44,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:44,098 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2023-11-12 01:02:44,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.130434782608696) internal successors, (49), 24 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:44,098 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2023-11-12 01:02:44,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 01:02:44,099 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:44,099 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:44,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:44,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:44,305 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:44,305 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:44,305 INFO L85 PathProgramCache]: Analyzing trace with hash -507139162, now seen corresponding path program 1 times [2023-11-12 01:02:44,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:44,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608982115] [2023-11-12 01:02:44,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:44,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:44,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:44,687 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:44,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:44,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608982115] [2023-11-12 01:02:44,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608982115] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:44,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641793040] [2023-11-12 01:02:44,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:44,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:44,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:44,690 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:44,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 01:02:44,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:44,844 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-12 01:02:44,846 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:44,859 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-11-12 01:02:45,020 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 01:02:45,053 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 01:02:45,131 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:45,131 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:45,352 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 01:02:45,352 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2023-11-12 01:02:45,364 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 01:02:45,364 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2023-11-12 01:02:45,372 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-11-12 01:02:45,752 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:45,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641793040] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:45,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417430642] [2023-11-12 01:02:45,758 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 01:02:45,759 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:45,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:45,759 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:45,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:48,352 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:50,813 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3588#(and (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (or (< |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1))) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (= |ULTIMATE.start_cstrlen_#res#1| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrstr_~len~0#1| 0))' at error location [2023-11-12 01:02:50,813 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:50,814 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:50,814 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2023-11-12 01:02:50,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206157705] [2023-11-12 01:02:50,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:50,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 01:02:50,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:50,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 01:02:50,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1502, Unknown=3, NotChecked=0, Total=1640 [2023-11-12 01:02:50,817 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:51,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:51,204 INFO L93 Difference]: Finished difference Result 111 states and 131 transitions. [2023-11-12 01:02:51,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 01:02:51,205 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-12 01:02:51,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:51,206 INFO L225 Difference]: With dead ends: 111 [2023-11-12 01:02:51,206 INFO L226 Difference]: Without dead ends: 94 [2023-11-12 01:02:51,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=193, Invalid=1784, Unknown=3, NotChecked=0, Total=1980 [2023-11-12 01:02:51,208 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 90 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 473 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:51,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 473 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 01:02:51,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-12 01:02:51,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2023-11-12 01:02:51,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 80 states have (on average 1.35) internal successors, (108), 91 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:51,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2023-11-12 01:02:51,212 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 23 [2023-11-12 01:02:51,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:51,212 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2023-11-12 01:02:51,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:51,212 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2023-11-12 01:02:51,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 01:02:51,213 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:51,213 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:51,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:51,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:51,414 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-12 01:02:51,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:51,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1148929410, now seen corresponding path program 5 times [2023-11-12 01:02:51,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:51,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24653271] [2023-11-12 01:02:51,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:51,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:51,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:52,086 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:52,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:52,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24653271] [2023-11-12 01:02:52,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24653271] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:52,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466349538] [2023-11-12 01:02:52,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:02:52,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:52,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:52,089 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:52,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce95bda-b631-4bab-92ff-1b16bca1220f/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process